论文翻译--人脸识别
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人脸识别论文中英文附录(原文及译文)翻译原文来自Thomas David Heselt ine BSc. Hons. The Un iversity of YorkDepartme nt of Computer Scie neeFor the Qualification of PhD. -- September 2005 -《Face Recog niti on: Two-Dime nsio nal and Three-Dime nsional Tech nique》4 Two-dimensional Face Recognition4.1 Feature LocalizationBefore discuss ing the methods of compari ng two facial images we now take a brief look at some at the prelimi nary processes of facial feature alig nment. This process typically con sists of two stages: face detect ion and eye localisati on. Depe nding on the applicati on, if the positi on of the face with in the image is known beforeha nd (for a cooperative subject in a door access system for example) the n the face detect ion stage can ofte n be skipped, as the regi on of in terest is already known. Therefore, we discuss eye localisati on here, with a brief discussi on of face detect ion in the literature review(sect ion 3.1.1).The eye localisati on method is used to alig n the 2D face images of the various test sets used throughout this section. However, to ensure that all results presented are represe ntative of the face recog niti on accuracy and not a product of the performa nee of the eye localisati on rout ine, all image alig nments are manu ally checked and any errors corrected, prior to testi ng and evaluati on.We detect the position of the eyes within an image using a simple template based method. A training set of manually pre-aligned images of faces is taken, and each image cropped to an area around both eyes. The average image is calculated and used as a template.Figure 4-1 - The average eyes. Used as a template for eye detection.Both eyes are in cluded in a sin gle template, rather tha n in dividually search ing for each eye in turn, as the characteristic symmetry of the eyes either side of the no se, provides a useful feature that helps disti nguish betwee n the eyes and other false positives that may be picked up in the background. Although this method is highly susceptible to scale(i.e. subject distance from the camera) and also in troduces the assumpti on that eyes in the image appear n ear horiz on tai. Some preliminary experimentation also reveals that it is advantageous to include the area of skin just ben eath the eyes. The reas on being that in some cases the eyebrows can closely match the template, particularly if thereare shadows in the eye-sockets, but the area of skin below the eyes helps to disti nguish the eyes from eyebrows (the area just below the eyebrows con tai n eyes, whereas the area below the eyes contains only plain skin).A window is passed over the test images and the absolute difference taken to that of the average eye image shown above. The area of the image with the lowest difference is taken as the region of interest containing the eyes. Applying the same procedure using a smaller template of the in dividual left and right eyes the n refi nes each eye positi on.This basic template-based method of eye localisati on, although provid ing fairly preciselocalisati ons, ofte n fails to locate the eyes completely. However, we are able to improve performa nce by in cludi ng a weighti ng scheme.Eye localisati on is performed on the set of training images, which is the n separated in to two sets: those in which eye detect ion was successful; and those in which eye detect ion failed. Taking the set of successful localisatio ns we compute the average dista nce from the eye template (Figure 4-2 top). Note that the image is quite dark, indicating that the detected eyes correlate closely to the eye template, as we would expect. However, bright points do occur near the whites of the eye, suggesting that this area is often inconsistent, varying greatly from the average eye template.Figure 4-2 -Distance to the eye template for successful detections (top) indicating variance due to noise and failed detections (bottom) showing credible variance due to miss-detected features.In the lower image (Figure 4-2 bottom), we have take n the set of failed localisati on s(images of the forehead, no se, cheeks, backgro und etc. falsely detected by the localisati on routi ne) and once aga in computed the average dista nce from the eye template. The bright pupils surr oun ded by darker areas in dicate that a failed match is ofte n due to the high correlati on of the nose and cheekb one regi ons overwhel ming the poorly correlated pupils. Wanting to emphasise the differenee of the pupil regions for these failed matches and minimise the varianee of the whites of the eyes for successful matches, we divide the lower image values by the upper image to produce a weights vector as show n in Figure 4-3. When applied to the differe nee image before summi ng a total error, this weight ing scheme provides a much improved detect ion rate.Figure 4-3 - Eye template weights used to give higher priority to those pixels that best represent the eyes.4.2 The Direct Correlation ApproachWe begi n our inv estigatio n into face recog niti on with perhaps the simplest approach,k nown as the direct correlation method (also referred to as template matching by Brunelli and Poggio [29 ]) inv olvi ng the direct comparis on of pixel inten sity values take n from facial images. We use the term ‘ Direct Correlation ' to encompass all techniques in which face images are compareddirectly, without any form of image space an alysis, weight ing schemes or feature extracti on, regardless of the dsta nee metric used. Therefore, we do not infer that Pears on ' s correlat applied as the similarity fun cti on (although such an approach would obviously come un der our definition of direct correlation). We typically use the Euclidean distance as our metric in these inv estigati ons (in versely related to Pears on ' s correlati on and can be con sidered as a scale tran slati on sen sitive form of image correlati on), as this persists with the con trast made betwee n image space and subspace approaches in later sect ions.Firstly, all facial images must be alig ned such that the eye cen tres are located at two specified pixel coord in ates and the image cropped to remove any backgro und in formati on. These images are stored as greyscale bitmaps of 65 by 82 pixels and prior to recog niti on con verted into a vector of 5330 eleme nts (each eleme nt containing the corresp onding pixel inten sity value). Each corresp onding vector can be thought of as describ ing a point with in a 5330 dime nsional image space. This simple prin ciple can easily be exte nded to much larger images: a 256 by 256 pixel image occupies a si ngle point in 65,536-dime nsional image space and again, similar images occupy close points within that space. Likewise, similar faces are located close together within the image space, while dissimilar faces are spaced far apart. Calculati ng the Euclidea n dista need, betwee n two facial image vectors (ofte n referred to as the query image q, and gallery imageg), we get an indication of similarity. A threshold is then applied to make the final verification decision.d q g (d threshold ? accept) d threshold ? reject ) . Equ. 4-14.2.1 Verification TestsThe primary concern in any face recognition system is its ability to correctly verify aclaimed identity or determine a person's most likely identity from a set of potential matches in a database. In order to assess a given system ' s ability to perform these tasks, a variety of evaluati on methodologies have arise n. Some of these an alysis methods simulate a specific mode of operatio n (i.e. secure site access or surveilla nee), while others provide a more mathematical description of data distribution in some classificatio n space. In additi on, the results gen erated from each an alysis method may be prese nted in a variety of formats. Throughout the experime ntatio ns in this thesis, weprimarily use the verification test as our method of analysis and comparison, although we also use Fisher Lin ear Discrim inant to an alyse in dividual subspace comp onents in secti on 7 and the iden tificati on test for the final evaluatio ns described in sect ion 8. The verificati on test measures a system ' s ability to correctly accept or reject the proposed ide ntity of an in dividual. At a fun cti on al level, this reduces to two images being prese nted for comparis on, for which the system must return either an accepta nee (the two images are of the same pers on) or rejectio n (the two images are of differe nt people). The test is desig ned to simulate the applicati on area of secure site access. In this scenario, a subject will present some form of identification at a point of en try, perhaps as a swipe card, proximity chip or PIN nu mber. This nu mber is the n used to retrieve a stored image from a database of known subjects (ofte n referred to as the target or gallery image) and compared with a live image captured at the point of entry (the query image). Access is the n gran ted depe nding on the accepta nce/rejecti on decisi on.The results of the test are calculated accord ing to how many times the accept/reject decisi on is made correctly. In order to execute this test we must first define our test set of face images. Although the nu mber of images in the test set does not affect the results produced (as the error rates are specified as percentages of image comparisons), it is important to ensure that the test set is sufficie ntly large such that statistical ano malies become in sig ni fica nt (for example, a couple of badly aligned images matching well). Also, the type of images (high variation in lighting, partial occlusions etc.) will significantly alter the results of the test. Therefore, in order to compare multiple face recog niti on systems, they must be applied to the same test set.However, it should also be no ted that if the results are to be represe ntative of system performance in a real world situation, then the test data should be captured under precisely the same circumsta nces as in the applicati on en vir onmen t. On the other han d, if the purpose of the experime ntati on is to evaluate and improve a method of face recog niti on, which may be applied to a range of applicati on en vir onmen ts, the n the test data should prese nt the range of difficulties that are to be overcome. This may mea n in cludi ng a greater perce ntage of ‘ difficult would be expected in the perceived operati ng con diti ons and hence higher error rates in the results produced. Below we provide the algorithm for execut ing the verificati on test. The algorithm is applied to a sin gle test set of face images, using a sin gle fun cti on call to the face recog niti on algorithm: CompareFaces(FaceA, FaceB). This call is used to compare two facial images, returni ng a dista nce score in dicat ing how dissimilar the two face images are: the lower the score the more similar the two face images. Ideally, images of the same face should produce low scores, while images of differe nt faces should produce high scores.Every image is compared with every other image, no image is compared with itself and no pair is compared more tha n once (we assume that the relati on ship is symmetrical). Once two images have been compared, producing a similarity score, the ground-truth is used to determine if the images are ofthe same person or different people. In practical tests this information is ofte n en capsulated as part of the image file name (by means of a unique pers on ide ntifier). Scores are the n stored in one of two lists: a list containing scores produced by compari ng images of differe nt people and a list containing scores produced by compari ng images of the same pers on. The final accepta nce/reject ion decisi on is made by applicati on of a threshold. Any in correct decision is recorded as either a false acceptance or false rejection. The false rejection rate (FRR) is calculated as the perce ntage of scores from the same people that were classified as rejectio ns. The false accepta nce rate (FAR) is calculated as the perce ntage of scores from differe nt people that were classified as accepta nces.For IndexA = 0 to length (TestSet)For IndexB = lndexA+1 to length (T estSet)Score = CompareFaces (T estSet[IndexA], TestSet[IndexB]) If IndexA and IndexB are the same person Append Score to AcceptScoresListElseAppend Score to RejectScoresListFor Threshold = Minimum Score to Maximum Score:FalseAcceptCount, FalseRejectCount = 0For each Score in RejectScoresListIf Score <= ThresholdIncrease FalseAcceptCountFor each Score in AcceptScoresListIf Score > ThresholdIncrease FalseRejectCountFalseAcceptRate = FalseAcceptCount / Length(AcceptScoresList) FalseRejectRate = FalseRejectCount / length(RejectScoresList) Add plot to error curve at (FalseRejectRate, FalseAcceptRate)These two error rates express the in adequacies of the system whe n operat ing at aspecific threshold value. Ideally, both these figures should be zero, but in reality reducing either the FAR or FRR (by alteri ng the threshold value) will in evitably resultin increasing the other. Therefore, in order to describe the full operating range of a particular system, we vary the threshold value through the en tire range of scores produced. The applicati on of each threshold value produces an additi onal FAR, FRR pair, which when plotted on a graph produces the error rate curve shown below.Figure 4-5 - Example Error Rate Curve produced by the verification test.The equal error rate (EER) can be see n as the point at which FAR is equal to FRR. This EER value is often used as a single figure representing the general recognition performa nee of a biometric system and allows for easy visual comparis on of multiple methods. However, it is important to note that the EER does not indicate the level of error that would be expected in a real world applicati on .It is un likely that any real system would use a threshold value such that the perce ntage of false accepta nces were equal to the perce ntage of false rejecti ons. Secure site access systems would typically set the threshold such that false accepta nces were sig nifica ntly lower tha n false rejecti ons: unwilling to tolerate intruders at the cost of inconvenient access denials.Surveilla nee systems on the other hand would require low false rejectio n rates to successfully ide ntify people in a less con trolled en vir onment. Therefore we should bear in mind that a system with a lower EER might not n ecessarily be the better performer towards the extremes of its operating capability.There is a strong conn ecti on betwee n the above graph and the receiver operat ing characteristic (ROC) curves, also used in such experime nts. Both graphs are simply two visualisati ons of the same results, in that the ROC format uses the True Accepta nee Rate(TAR), where TAR = 1.0 -FRR in place of the FRR, effectively flipping the graph vertically. Another visualisation of the verification test results is to display both the FRR and FAR as functions of the threshold value. This prese ntati on format provides a refere nee to determ ine the threshold value necessary to achieve a specific FRR and FAR. The EER can be seen as the point where the two curves in tersect.ThrasholdFigure 4-6 - Example error rate curve as a function of the score thresholdThe fluctuati on of these error curves due to no ise and other errors is depe ndant on the nu mber of face image comparis ons made to gen erate the data. A small dataset that on ly allows for a small nu mber of comparis ons will results in a jagged curve, in which large steps corresp ond to the in flue nce of a si ngle image on a high proporti on of thecomparis ons made. A typical dataset of 720 images (as used in sect ion 422) provides 258,840 verificatio n operati ons, hence a drop of 1% EER represe nts an additi onal 2588 correct decisions, whereas the quality of a single image could cause the EER tofluctuate by up to 0.28.4.2.2 ResultsAs a simple experiment to test the direct correlation method, we apply the technique described above to a test set of 720 images of 60 different people, taken from the AR Face Database [ 39 ]. Every image is compared with every other image in the test set to produce a like ness score, provid ing 258,840 verificati on operati ons from which to calculate false accepta nce rates and false rejecti on rates. The error curve produced is show n in Figure 4-7.Figure 4-7 - Error rate curve produced by the direct correlation method using no image preprocessing.We see that an EER of 25.1% is produced, meaning that at the EER thresholdapproximately one quarter of all verification operations carried out resulted in anin correct classificati on. There are a nu mber of well-k nown reas ons for this poor levelof accuracy. Tiny changes in lighting, expression or head orientation cause the location in image space to cha nge dramatically. Images in face space are moved far apart due to these image capture conditions, despite being of the same person ' s face. The distanee between images differe nt people becomes smaller tha n the area of face space covered by images of the same pers on and hence false accepta nces and false rejecti ons occur freque ntly. Other disadva ntages in clude the large amount of storage n ecessary for holdi ng many face images and the inten sive process ing required for each comparis on, making this method un suitable for applicati ons applied to a large database. In secti on 4.3 we explore the eige nface method, which attempts to address some of these issues.4二维人脸识别4.1功能定位在讨论比较两个人脸图像,我们现在就简要介绍的方法一些在人脸特征的初步调整过程。
①现代的人脸识别,特指通过分析、比较人脸视觉特征信息进行身份鉴别的计算机技术。
具体而言,就是通过视频采集设备获取识别对象的面部图像,再利用核心的算法对其脸部的五官位置、脸型和角度进行计算分析,进而和自身数据库里已有的范本进行比对,最后判断出用户的真实身份。
这是一项高端的计算机图像处理技术。
②在全球范围内,人脸识别系统的研究始于20 世纪60 年代。
人脸识别的优势在于其自然性和不被被测个体察觉的特点。
所谓自然性,是指该识别方式同人类(甚至其他生物)进行个体识别时所利用的生物特征相同。
人脸识别就是通过观察比较人脸来区分和确认身份的。
不被察觉的特点会使该识别方法不令人反感,并且因为不容易引起人的注意而不易被欺骗。
相对于指纹识别而言,人脸识别还具有非接触式(非侵犯式)的特点,因此更加友好、自然,更易被人们接受。
③随着科技的发展,人脸识别技术的应用已经不是什么新鲜事了。
人脸识别技术观点英语作文Here is an English essay on the topic of facial recognition technology, with the content exceeding 1000 words as requested. The essay is written without a title and without any additional punctuation marks in the main body.Facial recognition technology has become increasingly prevalent in our modern society with its wide-ranging applications across various sectors. This advanced biometric identification system utilizes algorithms to map an individual's facial features and compare them against a database of stored facial profiles. While the technology offers numerous benefits in terms of security enhancement and convenience, it also raises significant ethical and privacy concerns that warrant careful consideration.One of the primary advantages of facial recognition technology is its ability to enhance security measures. In the realm of law enforcement, this technology can aid in the identification and apprehension of criminals, potentially leading to improved public safety. By cross-referencing facial data with criminal databases, authorities can quickly and accurately pinpoint suspects, streamlining investigative processes. Additionally, this technology can beimplemented in secure access control systems, ensuring that only authorized individuals can gain entry to sensitive areas or facilities, thereby reducing the risk of unauthorized access.Furthermore, facial recognition technology has proven invaluable in various commercial and social applications. Retailers can leverage this technology to personalize customer experiences, offering targeted advertisements and recommendations based on individual preferences. In the financial sector, banks can utilize facial recognition for secure authentication, reducing the reliance on traditional password-based systems and enhancing the overall security of transactions. Similarly, social media platforms can employ facial recognition to facilitate features such as automatic tagging and photo organization, improving user experience and engagement.However, the widespread adoption of facial recognition technology also raises significant ethical and privacy concerns. One of the primary issues is the potential for infringement on individual privacy. The collection and storage of biometric data, such as facial profiles, without explicit consent or adequate safeguards, can be perceived as a violation of an individual's right to privacy. This concern is amplified by the possibility of unauthorized access or misuse of this sensitive information, which could lead to identity theft, stalking, or other malicious activities.Moreover, the accuracy and reliability of facial recognition systems have come under scrutiny. Studies have shown that these systems can exhibit biases, often performing less accurately for individuals from certain demographic groups, such as women and people of color. This bias can lead to disproportionate targeting or false identifications, which can have severe consequences, particularly in law enforcement contexts. The potential for such errors to perpetuate societal inequalities and undermine the principles of fairness and justice is a significant concern.Another pressing issue is the lack of comprehensive regulatory frameworks governing the use of facial recognition technology. In many countries, the legal landscape surrounding the collection, storage, and application of biometric data remains unclear, leaving individuals vulnerable to potential abuses. Without clear guidelines and oversight, there is a risk of unchecked surveillance, profiling, and discrimination, which can erode the fundamental civil liberties and democratic principles that societies strive to uphold.Furthermore, the potential for the misuse of facial recognition technology by authoritarian regimes or malicious actors is a grave concern. Unchecked access to this technology could enable the monitoring and suppression of dissent, the targeting of minority groups, and the erosion of freedom of expression and association. The dystopian scenarios envisioned in works of science fiction havethe potential to become a reality if appropriate safeguards and ethical considerations are not prioritized.In response to these concerns, there have been growing calls for greater regulation and oversight of facial recognition technology. Policymakers and civil society organizations have advocated for the implementation of robust privacy laws, data protection frameworks, and algorithmic accountability measures. These efforts aim to ensure that the development and deployment of facial recognition systems are aligned with fundamental human rights and that individuals are granted the necessary protections against potential abuses.Additionally, there have been calls for increased transparency and public discourse around the use of facial recognition technology. Engaging with diverse stakeholders, including privacy advocates, technology experts, and affected communities, can help shape policies that strike a balance between the benefits of the technology and the preservation of individual rights and civil liberties.It is also crucial that the developers and deployers of facial recognition systems prioritize the principles of fairness, non-discrimination, and ethical design. This includes addressing the issue of algorithmic bias, improving the accuracy and reliability of the technology, and implementing rigorous testing and auditing procedures to identify and mitigate potential harms.In conclusion, the rapid advancement of facial recognition technology presents both opportunities and challenges. While the technology offers valuable applications in enhancing security and enabling convenient commercial and social experiences, the ethical and privacy concerns it raises cannot be overlooked. Striking the right balance between the benefits of the technology and the protection of individual rights will require a multifaceted approach involving robust regulation, transparent governance, and a commitment to ethical and responsible development. As we navigate the evolving landscape of facial recognition technology, it is crucial that we prioritize the preservation of fundamental human rights and the well-being of individuals and society as a whole.。
人脸识别技术的作文英文回答:Face recognition technology, also known as facial recognition, is a biometric technology that uses algorithms to identify and verify individuals based on their facial features. It has gained significant attention andpopularity in recent years due to its potentialapplications in various fields such as security, law enforcement, and personal identification.One of the key advantages of face recognition technology is its convenience. Unlike other biometric technologies that require physical contact or specific positioning, face recognition can be performed from a distance, making it non-intrusive and user-friendly. This means that individuals can be identified simply by looking at a camera or a sensor, without the need for anyadditional actions or devices.Another benefit of face recognition technology is its accuracy. Advanced algorithms have been developed to analyze and match facial features, resulting in high precision and reliability. This makes it a valuable tool in law enforcement and security applications, where accurate identification is crucial for maintaining public safety.Face recognition technology also offers improved efficiency and productivity. For example, in airports, it can significantly speed up the process of passenger verification and boarding by automatically matching the faces of travelers with their passport photos or other identification documents. This not only reduces waiting times but also minimizes the potential for human error.However, it is important to address the concerns and limitations associated with face recognition technology. Privacy is often a major concern, as the collection and storage of facial data raise questions about data security and potential misuse. Additionally, there have been concerns about the potential for bias and discrimination in the algorithms used for face recognition, particularly whenit comes to individuals from marginalized groups.中文回答:人脸识别技术,也被称为面部识别,是一种生物识别技术,通过算法根据人脸特征来识别和验证个人身份。
人脸识别英语作文Facial Recognition: A Double-Edged Sword in the Digital AgeIn the realm of technology, few innovations have garnered as much attention and debate as facial recognition. This technology, which utilizes artificial intelligence toidentify individuals by analyzing their facial features, has been hailed for its potential to revolutionize security, enhance user experiences, and streamline various processes. However, it also raises significant concerns about privacy, ethical use, and the potential for abuse.One of the most prominent uses of facial recognition isin security systems. Airports, for instance, have begun to implement facial recognition gates that can verifypassengers' identities swiftly and accurately, reducing wait times and the risk of human error. Similarly, law enforcement agencies have employed this technology to track down criminals, locate missing persons, and prevent crime by identifying individuals in public spaces.On the commercial side, facial recognition has been integrated into smartphones for user authentication,providing a convenient and secure method of unlocking devices. Retailers are also exploring its use to personalize shopping experiences, recognize loyal customers, and even predict shopping trends based on demographic data.Despite these benefits, the technology is not without its critics. Privacy advocates argue that the widespread use of facial recognition could lead to a surveillance state where individuals' movements and behaviors are constantly monitored without their consent. There are also concerns about the accuracy of the technology, with studies showing that it can be less effective for certain demographics, potentially leading to false identifications and unjust consequences.Moreover, the ethical implications of facial recognition are profound. Who has the right to access this technology and how it is used? What safeguards are in place to prevent misuse? These questions become even more critical when considering the potential for facial recognition to be usedin more invasive ways, such as monitoring political dissent or suppressing minority groups.Regulation is a key component in addressing these concerns. Governments and international bodies must work together to establish clear guidelines on the use of facial recognition technology. This includes ensuring transparencyin how the data is collected, stored, and used, as well as implementing strict penalties for misuse.In conclusion, facial recognition represents asignificant leap forward in technological capability. It has the potential to greatly enhance security, efficiency, and personalization in various sectors. However, it also presents a profound challenge to our understanding of privacy and personal freedom. As this technology continues to evolve, itis imperative that we approach its use with caution, guided by a robust ethical framework and stringent regulation to ensure that it serves as a tool for societal benefit rather than a weapon against individual liberty.。
人脸识别简短英语作文Title: Facial Recognition Technology Revolutionizing Security and Convenience。
Introduction:Facial recognition technology has emerged as a groundbreaking innovation that has revolutionized various aspects of our lives. This cutting-edge technology utilizes biometric data to identify individuals based on theirunique facial features. With its ability to enhancesecurity measures and streamline processes, facial recognition has become increasingly popular in recent years.Body:1. Enhanced Security Measures:Facial recognition technology has significantlyimproved security measures in various sectors. For instance,it is extensively used in law enforcement agencies to identify criminals and suspects. By comparing facial images captured from surveillance cameras with a comprehensive database, authorities can quickly identify and apprehend potential threats. This has proven to be a valuable tool in preventing crime and maintaining public safety.2. Convenient Access Control:Facial recognition technology has simplified access control systems, making them more convenient and efficient. Traditional methods such as key cards or passwords can easily be lost or stolen, compromising security. However, with facial recognition, individuals can gain access to secure areas simply by having their face scanned. This eliminates the need for physical tokens and enhances security by ensuring that only authorized personnel can enter restricted areas.3. Improved User Experience:Facial recognition technology has significantlyimproved user experiences in various industries. For example, in the travel sector, airports have adopted facial recognition systems to expedite the check-in and boarding processes. Passengers can simply have their faces scanned, eliminating the need for physical documents and reducing waiting times. This not only enhances convenience but also improves overall customer satisfaction.4. Efficient Identification and Verification:Facial recognition technology has made identification and verification processes more efficient and accurate. In sectors such as banking and finance, this technology is used for identity verification during customer onboarding. By comparing a person's facial image with their official identification documents, banks can ensure that the person opening an account is indeed the rightful owner. This helps prevent identity theft and fraudulent activities, enhancing the overall security of financial transactions.5. Ethical and Privacy Concerns:While facial recognition technology offers numerous benefits, it also raises ethical and privacy concerns. The collection and storage of biometric data raise questions about the potential misuse of personal information. Additionally, there is a risk of false positives or false negatives, leading to wrongful identification or exclusion. Striking a balance between security and privacy is crucial to ensure the responsible and ethical use of facial recognition technology.Conclusion:Facial recognition technology has transformed security measures and improved convenience in various sectors. Its ability to enhance identification processes, simplify access control, and improve user experiences has made it an invaluable tool in today's world. However, it is essential to address ethical and privacy concerns to ensure the responsible and ethical use of this technology. With continued advancements and careful considerations, facial recognition technology will continue to shape the future, making our lives safer and more convenient.。
人脸识别便捷性的英语作文Facial recognition technology has become increasingly prevalent in our daily lives, offering a convenient and efficient way to authenticate our identity. This innovative technology has transformed the way we interact with various systems and devices, making our lives more seamless and secure. In this essay, we will explore the advantages and potential drawbacks of facial recognition technology, and discuss its impact on our society.One of the primary benefits of facial recognition is its convenience. Gone are the days when we had to remember countless passwords or carry around physical identification cards. With facial recognition, we can simply look at our devices, and they will instantly recognize us, granting us access to our accounts, devices, and even secure facilities. This streamlined process saves us time and effort, allowing us to focus on more important tasks.Moreover, facial recognition technology enhances security by providing a robust and reliable method of identification. Traditional forms of identification, such as passwords and ID cards, can be easily lost, stolen, or compromised. Facial recognition, on the other hand, relies on unique biometric data that is virtually impossible toreplicate, making it a more secure option for protecting sensitive information and assets.In the realm of law enforcement, facial recognition has proven to be a valuable tool in identifying and apprehending criminals. By cross-referencing facial images with extensive databases, law enforcement agencies can quickly and accurately identify suspects, aiding in the investigation and prosecution of crimes. This technology has the potential to significantly improve public safety and deter criminal activity.Another area where facial recognition has made a significant impact is in the field of healthcare. Healthcare providers can use this technology to quickly and accurately identify patients, ensuring that they receive the appropriate treatment and medication. This can be particularly beneficial in emergency situations, where every second counts. Additionally, facial recognition can be used to monitor patient well-being, alerting healthcare professionals to any changes or concerns.However, the widespread use of facial recognition technology has also raised concerns about privacy and civil liberties. There are valid concerns that this technology could be misused or abused, leading to the surveillance of individuals without their consent. There are also worries that facial recognition databases could be hacked oraccessed by unauthorized parties, putting sensitive personal information at risk.To address these concerns, policymakers and technology companies must work together to develop robust regulations and security measures to protect the privacy and rights of individuals. This may include implementing strict data-sharing protocols, ensuring transparency in the use of facial recognition technology, and providing individuals with the ability to opt-out or control how their facial data is used.Furthermore, the accuracy and reliability of facial recognition technology must be carefully evaluated and improved. Certain studies have shown that facial recognition algorithms can exhibit bias and inaccuracies, particularly when it comes to identifying individuals with diverse racial and ethnic backgrounds. It is crucial that these issues are addressed to ensure that the technology is fair and equitable for all users.In conclusion, facial recognition technology has revolutionized the way we interact with the world around us. Its convenience, security, and potential applications in various industries make it a valuable tool. However, we must also be mindful of the potential risks and work to address them through responsible development and implementation of this technology. By striking a balance between thebenefits and the concerns, we can harness the power of facial recognition to improve our lives while safeguarding our fundamental rights and freedoms.。
人脸识别英文作文I think facial recognition technology is both fascinating and a little bit scary. It's amazing how a computer can analyze and identify a person's face with such accuracy. It's like something out of a sci-fi movie.The idea of being able to unlock your phone or access your bank account just by looking at a camera is pretty cool. It's convenient and feels like the future is already here.On the other hand, the thought of cameras everywhere being able to track and identify us at any time is a little unsettling. It feels like our privacy is being invaded, and it's hard to know who might have access to all that information.I also worry about the potential for misuse of facial recognition technology. It's easy to imagine how it could be used for surveillance or even discrimination. It'simportant to have regulations in place to protect people from these kinds of abuses.At the same time, there are also some really positive uses for facial recognition. For example, it can help law enforcement identify criminals or find missing persons. It can also be used for security in places like airports and government buildings.Overall, I think facial recognition technology has alot of potential, but it's important to proceed with caution. We need to balance the benefits with the potential risks and make sure that people's rights and privacy are protected.。
Face Recognition: A Double-Edged Sword ofModern TechnologyIn the age of digital transformation, face recognition technology has become a ubiquitous part of our daily lives. From unlocking smartphones to accessing secure areas, this cutting-edge technology has revolutionized the way we interact with the world. However, as with any technology, face recognition presents both remarkable benefits and significant concerns.The primary benefit of face recognition is its convenience and efficiency. Gone are the days of fumbling with keys or forgetting passwords. With a simple glance at a camera, individuals can gain access to their devices or buildings with ease. This便利has streamlined numerous processes, from airport security checks to retail payments, significantly improving the user experience.Moreover, face recognition has immense potential in law enforcement and national security. It can assist in identifying criminals, tracking fugitives, and even preventing crimes by recognizing suspicious activities. Thetechnology has been used successfully in various countries to solve crimes and keep the public safe.However, the rise of face recognition technology also raises serious privacy concerns. In a world where every face can be captured and identified, the potential for misuse and abuse is alarming. Governments and corporations could potentially misuse this data for surveillance, stalking, or even discrimination. Furthermore, the storage and protection of this sensitive information aresignificant challenges that need to be addressed.Moreover, the accuracy of face recognition technologyis not without flaws. While it can be highly accurate in ideal conditions, factors such as lighting, angles, and even facial hair can affect recognition rates. This can lead to false positives or negatives, potentially resulting in embarrassing misidentifications or even serious consequences such as wrongful arrests.Additionally, the ethical implications of face recognition are profound. The technology has the potential to create a divide between those who are recognized and those who are not. This could lead to discriminationagainst certain groups, such as minorities or individuals with disabilities, who may be more difficult to identify. In conclusion, face recognition technology is a powerful tool that has brought remarkable benefits to our lives. However, it also poses significant challenges and concerns that need to be addressed. As we continue to embrace this technology, it is crucial that we do so with a balanced perspective, ensuring that its benefits are maximized while minimizing its negative impacts on privacy, security, and equality.**人脸识别:现代科技的双刃剑**在数字化转型的时代,人脸识别技术已经成为我们日常生活中无处不在的一部分。
对人脸识别的看法英语作文以下是关于对人脸识别的看法的英语作文:The influence of Face Swiping TechnologyIt is widely acknowledged that as the current world is ushering in the fourth revolution, various advanced technologies stand out, ranging from virtual reality, mobile payment, facing swiping and artificial intelligence. Among them, the face swiping technology has drawn wide attention of the general public, with different evaluations. Some hold that the technology poses great threats to human beings in that personal information is vulnerable to being stolen. Nevertheless, from my perspective, the merits dwarf its shortcomingsFirst, face recognition can reduce the criminal rate in the society. In the past, the technology of criminal investigation was not advanced, many of crimes were not solved owing to lack of critical clues and evidence. Hence, the criminal rate was very high and numerous criminals and suspects escaped to unknown regions.By contrast, In modern society, we have created the face swiping technology that can quickly and precisely identify facial information of a person by comparing with data tank containing the information of the majority of citizens. In this way, not only can the police arrest criminals effectively without any mistakes, but also those with illegal intentions are intimidated, dramatically reducing the crime rate.Second, face identification are very convenient to us. When buying some commodities, snacks or makeups in the supermarkets or shopping malls, we just need scan our face in front of checking machines without the necessity to take cashes or stand up in line for checking out, saving much time and energy. Besides, when we take a train or plane, it is not necessary to take tickets from the ticket widow. Instead, we just scan face in front of gate machines which can verify our train or plane information immediately.With just 2-3 seconds, we can enter the station successfully. Consequently, face recognition greatly facilitates our daily life.Of course, just as each coin has two sides, face scanning technology is no exception, which possibly leads to ineffective or wrong identification. At present, makeup and plastic surgeries are popular with the masses, which can drastically change people’s facial features or give some illegal individuals chances to pass for others for misconducts. In such circumstances, face swiping may not beneficial. However, this can be solved by upgrading the date bases and improving the precision of the technology.In a nutshell, although face scanning bring some risks, I contend that it favors us and the society more by dropping down criminal rate and creating a easier life. Therefore, it is suggested that scientists and researchers should spare no efforts to improve its quality and encourage its usage in the public.。
附录(原文及译文)翻译原文来自Thomas David Heseltine BSc. Hons. The University of YorkDepartment of Computer ScienceFor the Qualification of PhD. -- September 2005 -《Face Recognition: Two-Dimensional and Three-Dimensional Techniques》4 Two-dimensional Face Recognition4.1 Feature LocalizationBefore discussing the methods of comparing two facial images we now take a brief look at some at the preliminary processes of facial feature alignment. This process typically consists of two stages: face detection and eye localisation. Depending on the application, if the position of the face within the image is known beforehand (for a cooperative subject in a door access system for example) then the face detection stage can often be skipped, as the region of interest is already known. Therefore, we discuss eye localisation here, with a brief discussion of face detection in the literature review(section 3.1.1).The eye localisation method is used to align the 2D face images of the various test sets used throughout this section. However, to ensure that all results presented arerepresentative of the face recognition accuracy and not a product of the performance of the eye localisation routine, all image alignments are manually checked and any errors corrected, prior to testing and evaluation.We detect the position of the eyes within an image using a simple template based method. A training set of manually pre-aligned images of faces is taken, and eachimage cropped to an area around both eyes. The average image is calculated and usedas a template.Figure 4-1 - The average eyes. Used as a template for eye detection.Both eyes are included in a single template, rather than individually searching for each eye in turn, as the characteristic symmetry of the eyes either side of the nose, provides a useful feature that helps distinguish between the eyes and other false positives that may be picked up in the background. Although this method is highly susceptible to scale(i.e. subject distance from thecamera) and also introduces the assumption that eyes in the image appear near horizontal. Some preliminary experimentation also reveals that it is advantageous to include the area of skin just beneath the eyes. The reason being that in some cases the eyebrows can closely match the template, particularly if there are shadows in the eye-sockets, but the area of skin below the eyes helps to distinguish the eyes from eyebrows (the area just below the eyebrows contain eyes, whereas the area below the eyes contains only plain skin).A window is passed over the test images and the absolute difference taken to that of the average eye image shown above. The area of the image with the lowest difference is taken as the region of interest containing the eyes. Applying the same procedure using a smaller template of the individual left and right eyes then refines each eye position.This basic template-based method of eye localisation, although providing fairly preciselocalisations, often fails to locate the eyes completely. However, we are able to improve performance by including a weighting scheme.Eye localisation is performed on the set of training images, which is then separated into two sets: those in which eye detection was successful; and those in which eye detection failed. Taking the set of successful localisations we compute the average distance from the eye template (Figure 4-2 top). Note that the image is quite dark, indicating that the detected eyes correlate closely to the eye template, as we would expect. However, bright points do occur near the whites of the eye, suggesting that this area is often inconsistent, varying greatly from the average eye template.Figure 4-2 – Distance to the eye template for successful detections (top) indicating variance due tonoise and failed detections (bottom) showing credible variance due to miss-detected features.In the lower image (Figure 4-2 bottom), we have taken the set of failed localisations(images of the forehead, nose, cheeks, background etc. falsely detected by the localisation routine) and once again computed the average distance from the eye template. The bright pupils surrounded by darker areas indicate that a failed match is often due to the high correlation of the nose and cheekbone regions overwhelming the poorly correlated pupils. Wanting to emphasise thedifference of the pupil regions for these failed matches and minimise the variance of the whites of the eyes for successful matches, we divide the lower image values by the upper image to produce a weights vector as shown in Figure 4-3. When applied to the difference image before summing a total error, this weighting scheme provides a much improved detection rate.Figure 4-3 - Eye template weights used to give higher priority to those pixels that best represent the eyes.4.2 The Direct Correlation ApproachWe begin our investigation into face recognition with perhaps the simplest approach,known as the direct correlation method (also referred to as template matching by Brunelli and Poggio [ 29 ]) involving the direct comparison of pixel intensity values taken from facial images. We use the term ‘Direct Correlation’ to encompass all techniques in which face images are compared directly, without any form of image space analysis, weighting schemes or feature extraction, regardless of the di stance metric used. Therefore, we do not infer that Pearson’s correlation is applied as the similarity function (although such an approach would obviously come under our definition of direct correlation). We typically use the Euclidean distance as our metric in these investigations (inversely related to Pearson’s correlation and can be considered as a scale and translation sensitive form of image correlation), as this persists with the contrast made between image space and subspace approaches in later sections.Firstly, all facial images must be aligned such that the eye centres are located at two specified pixel coordinates and the image cropped to remove any backgroundinformation. These images are stored as greyscale bitmaps of 65 by 82 pixels and prior to recognition converted into a vector of 5330 elements (each element containing the corresponding pixel intensity value). Each corresponding vector can be thought of as describing a point within a 5330 dimensional image space. This simple principle can easily be extended to much larger images: a 256 by 256 pixel image occupies a single point in 65,536-dimensional image space and again, similar images occupy close points within that space. Likewise, similar faces are located close together within the image space, while dissimilar faces are spaced far apart. Calculating the Euclidean distance d, between two facial image vectors (often referred to as the query image q, and gallery image g), we get an indication of similarity. A threshold is then applied to make the final verification decision.d q g (d threshold ⇒accept d threshold ⇒reject ) . Equ. 4-14.2.1 Verification TestsThe primary concern in any face recognition system is its ability to correctly verify a claimed identity or determine a person's most likely identity from a set of potential matches in a database. In order to assess a given system’s ability to perform these tasks, a variety of evaluation methodologies have arisen. Some of these analysis methods simulate a specific mode of operation (i.e. secure site access or surveillance), while others provide a more mathematical description of data distribution in someclassification space. In addition, the results generated from each analysis method maybe presented in a variety of formats. Throughout the experimentations in this thesis, we primarily use the verification test as our method of analysis and comparison, although we also use Fisher’s Linear Discriminant to analyse individual subspace components in section 7 and the identification test for the final evaluations described in section 8. The verification test measures a system’s ability to correctly accept or reject the proposed identity of an individual. At a functional level, this reduces to two images being presented for comparison, for which the system must return either an acceptance (the two images are of the same person) or rejection (the two images are of different people). The test is designed to simulate the application area of secure site access. In this scenario, a subject will present some form of identification at a point of entry, perhaps as a swipe card, proximity chip or PIN number. This number is then used to retrieve a stored image from a database of known subjects (often referred to as the target or gallery image) and compared with a live image captured at the point of entry (the query image). Access is then granted depending on the acceptance/rejection decision.The results of the test are calculated according to how many times the accept/reject decision is made correctly. In order to execute this test we must first define our test set of face images. Although the number of images in the test set does not affect the results produced (as the error rates are specified as percentages of image comparisons), it is important to ensure that the test set is sufficiently large such that statistical anomalies become insignificant (for example, a couple of badly aligned images matching well). Also, the type of images (high variation in lighting, partial occlusions etc.) will significantly alter the results of the test. Therefore, in order to compare multiple face recognition systems, they must be applied to the same test set.However, it should also be noted that if the results are to be representative of system performance in a real world situation, then the test data should be captured under precisely the same circumstances as in the application environment.On the other hand, if the purpose of the experimentation is to evaluate and improve a method of face recognition, which may be applied to a range of application environments, then the test data should present the range of difficulties that are to be overcome. This may mean including a greater percentage of ‘difficult’ images thanwould be expected in the perceived operating conditions and hence higher error rates in the results produced. Below we provide the algorithm for executing the verification test. The algorithm is applied to a single test set of face images, using a single function call to the face recognition algorithm: CompareFaces(FaceA, FaceB). This call is used to compare two facial images, returning a distance score indicating how dissimilar the two face images are: the lower the score the more similar the two face images. Ideally, images of the same face should produce low scores, while images of different faces should produce high scores.Every image is compared with every other image, no image is compared with itself and no pair is compared more than once (we assume that the relationship is symmetrical). Once two images have been compared, producing a similarity score, the ground-truth is used to determine if the images are of the same person or different people. In practical tests this information is often encapsulated as part of the image filename (by means of a unique person identifier). Scores are then stored in one of two lists: a list containing scores produced by comparing images of different people and a list containing scores produced by comparing images of the same person. The final acceptance/rejection decision is made by application of a threshold. Any incorrect decision is recorded as either a false acceptance or false rejection. The false rejection rate (FRR) is calculated as the percentage of scores from the same people that were classified as rejections. The false acceptance rate (FAR) is calculated as the percentage of scores from different people that were classified as acceptances.For IndexA = 0 to length(TestSet)For IndexB = IndexA+1 to length(TestSet)Score = CompareFaces(TestSet[IndexA], TestSet[IndexB])If IndexA and IndexB are the same personAppend Score to AcceptScoresListElseAppend Score to RejectScoresListFor Threshold = Minimum Score to Maximum Score:FalseAcceptCount, FalseRejectCount = 0For each Score in RejectScoresListIf Score <= ThresholdIncrease FalseAcceptCountFor each Score in AcceptScoresListIf Score > ThresholdIncrease FalseRejectCountFalseAcceptRate = FalseAcceptCount / Length(AcceptScoresList)FalseRejectRate = FalseRejectCount / length(RejectScoresList)Add plot to error curve at (FalseRejectRate, FalseAcceptRate)These two error rates express the inadequacies of the system when operating at aspecific threshold value. Ideally, both these figures should be zero, but in reality reducing either the FAR or FRR (by altering the threshold value) will inevitably resultin increasing the other. Therefore, in order to describe the full operating range of aparticular system, we vary the threshold value through the entire range of scoresproduced. The application of each threshold value produces an additional FAR, FRRpair, which when plotted on a graph produces the error rate curve shown below.Figure 4-5 - Example Error Rate Curve produced by the verification test.The equal error rate (EER) can be seen as the point at which FAR is equal to FRR. This EER value is often used as a single figure representing the general recognitionperformance of a biometric system and allows for easy visual comparison of multiple methods. However, it is important to note that the EER does not indicate the level oferror that would be expected in a real world application. It is unlikely that any realsystem would use a threshold value such that the percentage of false acceptances wereequal to the percentage of false rejections. Secure site access systems would typicallyset the threshold such that false acceptances were significantly lower than false rejections: unwilling to tolerate intruders at the cost of inconvenient access denials.Surveillance systems on the other hand would require low false rejection rates tosuccessfully identify people in a less controlled environment. Therefore we should bear in mind that a system with a lower EER might not necessarily be the better performer towards the extremes of its operating capability.There is a strong connection between the above graph and the receiver operating characteristic (ROC) curves, also used in such experiments. Both graphs are simply two visualisations of the same results, in that the ROC format uses the True Acceptance Rate(TAR), where TAR = 1.0 – FRR in place of the FRR, effectively flipping the graph vertically. Another visualisation of the verification test results is to display both the FRR and FAR as functions of the threshold value. This presentation format provides a reference to determine the threshold value necessary to achieve a specific FRR and FAR. The EER can be seen as the point where the two curves intersect.Figure 4-6 - Example error rate curve as a function of the score threshold The fluctuation of these error curves due to noise and other errors is dependant on the number of face image comparisons made to generate the data. A small dataset that only allows for a small number of comparisons will results in a jagged curve, in which large steps correspond to the influence of a single image on a high proportion of thecomparisons made. A typical dataset of 720 images (as used in section 4.2.2) provides258,840 verification operations, hence a drop of 1% EER represents an additional 2588 correct decisions, whereas the quality of a single image could cause the EER tofluctuate by up to 0.28.4.2.2 ResultsAs a simple experiment to test the direct correlation method, we apply the technique described above to a test set of 720 images of 60 different people, taken from the AR Face Database [ 39 ]. Every image is compared with every other image in the test set to produce a likeness score, providing 258,840 verification operations from which to calculate false acceptance rates and false rejection rates. The error curve produced is shown in Figure 4-7.Figure 4-7 - Error rate curve produced by the direct correlation method using no image preprocessing.We see that an EER of 25.1% is produced, meaning that at the EER threshold approximately one quarter of all verification operations carried out resulted in anincorrect classification. There are a number of well-known reasons for this poor levelof accuracy. Tiny changes in lighting, expression or head orientation cause the location in image space to change dramatically. Images in face space are moved far apart due to these image capture conditions, despite being of the same person’s face. The distance between images of different people becomes smaller than the area of face space covered by images of the same person and hence false acceptances and false rejections occur frequently. Other disadvantagesinclude the large amount of storage necessary for holding many face images and the intensive processing required for each comparison, making this method unsuitable for applications applied to a large database. In section 4.3 we explore the eigenface method, which attempts to address some of these issues.4 二维人脸识别4.1 功能定位在讨论比较两个人脸图像,我们现在就简要介绍的方法一些在人脸特征的初步调整过程。