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A Study on the Very Low bit-rate Video Coding Based on Isodensity areas

基于等密度区域的极低码率视频编码研究

基本信息

批准号：
07455162
负责人：
MINAMI Toshi
金额：
$ 3.97万
依托单位：
Kanto Gakuin University (1996)Kogakuin University (1995)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455162/
关键词：
MPEG4 Modified HSV color system Facial area Object scalability Video coding 動画像 DCT 符号化アフィン変換極低ビットレート等濃線分布

项目摘要

In MPEG4, not only promotion of a low bit rate but also an object scalability depended on the contents of images are strongly requested. In this research project, an efficient video coding algorithm for the upper half of human body is propsed. In this coding system, a facial area, which is a moving object in image sequence, is extracted from both sending and receiving side without any control information. The candidate areas of person are segmented using color information and the moving areas. The color information, which represent human skin color, is extracted with modified HSV color system. The moving areas are estimated using the motion parameters of objects which are utilized for constructing a previous frame. Then a human face is extracted by merging the candidate areas based on hue-element of modified HSV color system. For a computer simulation, the standard video "Claire" and "Miss America" are used and facial areas are extracted precisely in all frames. The experimental results of "Claire" show that a signal to noise ratio is 34.1dB at 13.4kbits/sec and "Miss America" show that a signal to noise ratio is 33.1dB at 17.4kbits/sec on average respectively. From these experimental results, the prospects of adopting this method for a coding system of MPEG4 can be seriously considered.

在MPEG4中，不仅强烈要求提高低比特率，而且强烈要求依赖于图像内容的对象可扩展性。在这个研究项目中，提出了一种针对人体上半部的高效视频编码算法。在该编码系统中，面部区域是图像序列中的运动对象，从发送方和接收方提取，无需任何控制信息。使用颜色信息和运动区域来分割人的候选区域。采用改进的HSV颜色系统提取代表人类肤色的颜色信息。使用用于构建前一帧的对象的运动参数来估计运动区域。然后根据改进的HSV颜色系统的色调元素合并候选区域来提取人脸。对于计算机模拟，使用标准视频“克莱尔”和“美国小姐”，并在所有帧中精确提取面部区域。实验结果显示，“克莱尔”号在13.4kbits/sec下的平均信噪比为34.1dB，“美国小姐”在17.4kbits/sec下的平均信噪比为33.1dB。从这些实验结果来看，可以认真考虑在MPEG4编码系统中采用该方法的前景。