摘要
对可变树长混合小波和子树自量化分形视频编码方案进行了探讨。通过金字塔小波分解,每一视频序列帧被分解为多频率子带,将它们按一定方式组织成小波子树结构来表示视频序列的运动特性。对这些小波子树进行运动检测,分成运动树和非运动树两类。非运动树的编码直接、简单;运动树则采用可变树长混合小波和子树自量化方法来进行编码。实验结果表明:在低比特率情况下,文中所述的方案在PSNR(峰值信噪比)
Explorationhasbeenconductedtothevariabletree sizeadapativefractalvideocodingscheme basedonmixedwavelettransformationandsubtrees.Throghpyramidalwavelettransformation ,eachframeof videosequenceisdecomposedintomulti subbands,whicharestructuredintoasetofwaveletsubtreestorepre sentthemotioncharacteristicsofthevideosequence .Aftermotiondetection ,thesewaveletsubtreesareclassified into 2types,motionandnon motionsubtrees.Thecodingofnon motionsubtreesisstraightforwardandsimple , whilethemotionsubtreesareencodedusingvariabletree sizeadaptivefractalcodingbasedonmixedwavelet transformationandsubtrees.Experimentalresultshaveshownthattheproposedschemeprovidessatisfactory performanceintermsofbothPSNRandsubjectivequality .
出处
《南京邮电学院学报》
1999年第4期45-49,共5页
Journal of Nanjing University of Posts and Telecommunications(Natural Science)
关键词
可变树长
子树
自量化分形视频编码
混合小波
Pyramidal waveletde composition
Variable tree size
Rangetree
Domain tree
Motion sub tree
Non motionsubtree .
