包装装潢图像在小波压缩和分形压缩中的分析与比较
发布时间：2018-10-09 10:49
【摘要】： 在现今时代，信息交流日益频繁。对于包装印刷领域来说，印前处理主要是对图像及文字的处理和组版。而印前处理在印刷流程中占据相当重要的位置，其工作质量对印刷和印后流程有不可估量的影响。目前许多报刊杂志在全国都有很多印刷分点。及时有效地把报刊杂志文字和图像传输到全国各地的印刷分点就显得额外的重要，并且传输的文字和图像占据的网络带宽小。这样在同样的网络带宽下，可以起到提高网络传输的作用。 本课题就是针对上述问题，通过小波变换和分形这两种方法来进行图像压缩，对比起压缩效果，总结出分别适合于小波和分形压缩的图像。本课题中介绍了小波和分形图像压缩编码的历史和现状，总结了近年来在小波和分形的原理以及发展现状。在查阅了大量的资料和总结了他人的程序基础上，得出了小波和分形压缩程序。在选取了不同的图像，通过程序对比图像的压缩效果后，，获得了图像压缩在时间上和存储空间上的差异，以及人眼所能观察到的区别，并总结出了小波和分形的优缺点。本课题结尾介绍了一种在国内外都比较新颖的混合小波分形压缩方法，以及它的发展趋势。
[Abstract]:In the present age, information exchange is becoming more and more frequent. For the field of packaging and printing, prepress processing is mainly for image and text processing and composition. Prepress processing plays an important role in the printing process, and its working quality has an incalculable effect on the printing and post-press processes. At present, many newspapers and magazines in the country have a lot of printing points. It is very important to transmit the print and image of newspapers and magazines to print points all over the country in time and effectively, and the transmission of text and image occupies a small network bandwidth. In this way in the same network bandwidth, can play a role in improving the network transmission. Aiming at the above problems, the image compression is carried out by wavelet transform and fractal, and the compression effect is compared, and the image which is suitable for wavelet and fractal compression is summarized. In this paper, the history and present situation of wavelet and fractal image compression coding are introduced, and the principle and development of wavelet and fractal in recent years are summarized. On the basis of consulting a lot of data and summarizing the programs of others, the wavelet and fractal compression programs are obtained. After selecting different images and comparing the compression effects of images by program, the differences of image compression in time and storage space, and the differences observed by human eyes are obtained, and the advantages and disadvantages of wavelet and fractal are summarized. At the end of this paper, a novel hybrid wavelet fractal compression method and its development trend are introduced.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2004
【分类号】：TS851.6
本文编号：2259062
[Abstract]:In the present age, information exchange is becoming more and more frequent. For the field of packaging and printing, prepress processing is mainly for image and text processing and composition. Prepress processing plays an important role in the printing process, and its working quality has an incalculable effect on the printing and post-press processes. At present, many newspapers and magazines in the country have a lot of printing points. It is very important to transmit the print and image of newspapers and magazines to print points all over the country in time and effectively, and the transmission of text and image occupies a small network bandwidth. In this way in the same network bandwidth, can play a role in improving the network transmission. Aiming at the above problems, the image compression is carried out by wavelet transform and fractal, and the compression effect is compared, and the image which is suitable for wavelet and fractal compression is summarized. In this paper, the history and present situation of wavelet and fractal image compression coding are introduced, and the principle and development of wavelet and fractal in recent years are summarized. On the basis of consulting a lot of data and summarizing the programs of others, the wavelet and fractal compression programs are obtained. After selecting different images and comparing the compression effects of images by program, the differences of image compression in time and storage space, and the differences observed by human eyes are obtained, and the advantages and disadvantages of wavelet and fractal are summarized. At the end of this paper, a novel hybrid wavelet fractal compression method and its development trend are introduced.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2004
【分类号】：TS851.6
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本文编号：2259062
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