【作者】 郝小峰；

【导师】 孙德辉；

【作者基本信息】 北方工业大学 ， 检测技术与自动装置， 2006， 硕士

【摘要】 本文以北京市教委的科研课题——基于DSP的嵌入式图像WEB服务器的构建为应用背景,作者展开了在PC和DSP两个平台上对于数字图像编解码的研究以及技术实现。 研究主要方面包括:在PC平台上,对JPEG编解码算法的软件实现和在压缩率及运算速度两方面的优化;在目前的研究热点小波图像编码方面,作者设计并实现一种折中四叉树编码方法,并通过实验验证了这种编码算法运算复杂度小于JPEG2000的复杂度,压缩效率好于JPEG压缩效率的折中特性;使用C6711DSP和RCM3200设计并构建一个嵌入式图像WEB服务器。移植PC机的JPEG程序到DSP,反复研究实验来优化代码,图像压缩速度达到分辨率为576*720 YUV2:1:1的图像每秒压缩五帧。在RCM3200平台上开发基于CGI功能的主动刷新WEB服务器。 最后作者在PC平台上,汇总所有在图像编码解码研究时所编写的代码,编制一个集图像处理、图像压缩、图像解压缩、图像数据统计功能为一体的软件MultiPro。同时这个软件还附带了语音和网络功能。更多还原

【Abstract】 This paper’s background is scientific research task supported by Beijing Eucation Committee — developing image web server based on DSP, and author’s study and realization of coding and decoding digital image is introduced on PC and DSP platforms.The study majorly includes: on PC platform, software realizes JPEG coding and decoding, and optimizes compression rate and operation speed facets to JPEG;In Wavelet coding image aspect, the middle course four-branch tree coding is designed and realized by author.From much experiment,it is demonstrated that the coding method is simpler than JPEG2000, but better than JPEG in compression rate;Embeded image web server is designed and realized, using C6711 and RCM3200.JPEG code is transplanted from PC to DSP. From much research and experiment, five frames, with 720*576 and YUV2:1:1, are compressed every minute.On RCM3200 platform, active refurbishing web with CGI function is developed.At last, on PC platform author summarizes all codes of coding and decoding image programmed by author himself, and programs the software, named by MuliPro, with processing, coding, and decoding image.At the same time the software includes audio and net functions by the way.更多还原