一种基于PDCT的快速JPEG压缩算法  

A Fast JPEG Compress Algorithm Based on PDCT

作　　者：左龙军[1,2] 李和平[1] 李建雄[1] 

机构地区：[1]中国科学院电子学研究所,北京100190 [2]中国科学院研究生院,北京100039

出　　处：《科学技术与工程》2011年第17期3969-3974,共6页Science Technology and Engineering

基　　金：国家高技术研究发展计划(863计划)(098M170152)资助

摘　　要：为了在运算能力有限的嵌入式系统中运用JPEG压缩视频,实现了一种基于裁剪离散余弦变换(PDCT)的JPEG压缩算法,能在保证压缩率、压缩质量不变的情况下提高执行速度。在基于AT91SAM9G45的硬件平台上测试改进后的算法,结果表明算法的速度提升了两百多倍,达到了实时压缩PAL或NTSC视频的要求,有很高的应用价值。To apply JPEG compress algorithm on embedded system which is performance limited,an improved JPEG compress algorithm based on PDCT is implemented to increase the algorithm＇s efficiency while the compress ratio and distortion remains the same.The algorithm is tested on a hardware platform based on AT91SAM9G45 and the result shows that：the efficiency of the new JPEG algorithm is about two hundreds better than the original one, so it has great value in practice.

关 键 词：JPEG 裁剪离散余弦变换 离散余弦变换 

分 类 号：TN948.67[电子电信—信号与信息处理]