The objective world is a three-dimensional space, but the general image is two-dimensional. Two dimensional images inevitably lose part of the information in the process of reflecting the threedimensional world. Even recorded information can be distorted and even difficult to recognize objects. Therefore, it is necessary to recover and reconstruct information from images, and to analyze and extract mathematical models of images so that people can have a correct and profound understanding of what is recorded in the image. This process becomes the process of image processing.
1.1.2 Image technology and image engineering
• A brief history of digital image processing
The generation of digital pictures is far ahead of the computer. The first digital image transmitted by telegraph. In six and 70s, with the development of computer hardware and the discovery of fast Fu Liye transform algorithm, it was possible to use computer to process images. Since 80s, three dimensional images have been processed. Since 90s, with the improvement of computer performance and extensive use, image processing technology has been involved in every corner of society. The image has gradually dominated the media and produced many new industries and new opportunities. The future development of the image processing is limitless. Digital image processing belongs to computer science, but 90% of it relies on mathematics. From this point of view, the digital image processing technology is a very ideal direction for the students of this specialty.