图像有损压缩技术的研究.
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图像有损压缩技术的研究
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审定成绩:
XX大学XX学院
毕业设计(论文)
设计(论文)题目: 图像有损压缩技术的研究
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学 生 姓 名 :
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填表时间: 2013年06月
图像有损压缩技术的研究
- - II 摘 要
有损压缩技术是利用了人类对图像或声波中的某些频率成分不敏感的特性,允许压缩过程中损失一定的信息;虽然不能完全回复原始数据,但是所损失的部分对理解原始图像的影响缩小,却换来了大得多的压缩比。常见的声音、图像、视频压缩基本都是有损的。在多媒体应用中,常见的压缩方法有:预测编码,变换编码,矢量量化编码,分形编码等,混合编码是近年来广泛采用的方法。
有损数据压缩方法是经过压缩、解压的数据与原始数据不同但是非常接近的压缩方法。有损数据压缩又称破坏型压缩,即将次要的信息数据压缩掉,牺牲一些质量来减少数据量,使压缩比提高。它是与无损数据压缩对应的压缩方法。根据各种格式设计的不同,有损数据压缩都会产生丢失:压缩与解压文件都会带来渐进的质量下降。
本文首先论述了数字图像压缩技术的概况及发展趋势,详细介绍了现代图像压缩技术的标准、分类及主要算法。其次着重就图像的有损压缩技术进行了研究和讨论。通过查阅大量文献,系统的分析了有损压缩技术,介绍了主要有损压缩的方法:预测编码、变换编码、基于模型编码等有损压缩的主要技术,最后通过结合无损压缩从精确度及压缩比率等方面与损压缩进行详细比较,更深层次的对损压缩技术进行了解。并得出图像有损压缩技术的特点和优势,以及在未来压缩领域中的应用方向。
【关键词】有损压缩 无损压缩 压缩编码技术 比较 变换编码
图像有损压缩技术的研究
- - III
ABSTRACT
Lossy compression is to use the human is not sensitive to image or sound waves of certain
frequency components of the features that allow compression loss in the process of certain
information; Although not fully recover the raw data, but the loss of part of understanding the
influence of the original image is narrow, but the much larger compression ratio. Common voice,
image and video compression are hurt. In multimedia applications, the common compression
method are: predictive coding, transform coding, vector quantization coding and fractal coding, etc.,
hybrid coding is a widely used method in recent years.
Lossy data compression method is compressed and decompressed data with different but very
close to the original data compression method. Lossy data compression is also called
destructiveness compression, data compression is of secondary importance, sacrifice some quality
to reduce the amount of data, to improve the compression ratio. It is corresponding compression and
lose data compression method. According to different various format design, the lost can produce
lossy data compression: compress and decompress files brings with it a gradual decline in the
quality.
This paper first discusses the general situation and development trend of digital image
compression technology, introduced the modern standards, classification and main algorithm of
image compression technology. Secondly emphasize image lossy compression techniques are
studied and discussed. Through consulting a large number of literature, systematic analysis of lossy
compression technology, introduces the main lossy compression methods: predictive coding,
transform coding, based on the lossy compression of main technology such as model code, finally
through a combination of loss compression from precision and compression ratio compared with
loss of compression in detail, at a deeper level to understand loss compression technology. And
conclude the characteristics of image lossy compression technique and advantages, as well as
compression applications in the field of direction in the future.
【Key words】Lossy compression Lossless compression Coding and compressing technology
Compare transform coding 图像有损压缩技术的研究
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目 录
前 言 ...................................................................... 1
第一章 图像压缩技术的研究及进展 ............................................ 2
第一节 图像压缩技术概述 .................................................. 2
第二节 图像压缩技术标准 .................................................. 2
一、静止图像压缩标准 .................................................... 2
二、运动图像压缩标准 .................................................... 3
第三节 图像压缩技术分类 .................................................. 6
第四节 图像压缩技术的发展趋势 ............................................ 7
第五节 本章小结 .......................................................... 7
第二章 图像有损压缩技术 ..................................................... 8
第一节 有损压缩概述 ...................................................... 8
第二节 有损压缩机制 ...................................................... 9
第三节 本章小结 ......................................................... 10
第三章 图像有损压缩的主要编码技术 ......................................... 11
第一节 预测编码 ......................................................... 11
一、脉冲编码调制 ....................................................... 11
二、差分脉冲编码调制 ................................................... 12
三、自适应差分脉冲编码调制 ............................................. 13
第二节 变换编码 ......................................................... 14
第三节 基于模型编码 ..................................................... 15
一、基于语义编码 ....................................................... 16