【作者】 刘剑秋； 阮秋琦；

【Author】 Liu Jianqiu Ruan Qiuqi Institute of Information Science,Northern Jiaotong University Beijing 100044 P.R.China.

【机构】 北方交通大学信息科学研究所；

【摘要】 在极低比特率视频编码算法中,对感兴趣区域(ROI)优先进行编码能够获得更好的重建图像质量。在本文中,我们讨论了一种基于彩色直方图的人脸跟踪技术,它能够在头肩像图像序列中简单有效的准确定位ROI区域(人脸区域),并且,本文还提出了一种被称为小波块集合划分(SPWB)的小波编码算法用来对视频序列进行帧内编码,编码试验的结果表明,在同样的压缩比下,SPWB编码器能够获得比H.26L帧内编码器更好的重建图像质量。更多还原

【Abstract】 For very low bit-rate video coding,encode the region of interest with higher priority will achieve better decoded image, in this paper,we discuss a simple but robust face tracking technique base on color histogram analysis,this technique can locate the region of interest(face region) in head-shoulder image sequence,moreover,a wavelet based intra-frame codec that focusing on face region is proposed,which is called Set Partition in Wavelet Block(SPWB).Experimental results show that SPWB codec achieved better decoded image than H.26L intra-frame codec at the same compression ratio.更多还原