| 摘要: |
| 视频对象形状编码是视频压缩传输中的重要环节，为了获得较好的恢复图像质量，提
出了新的七方向差分链码的形状编码。在对象分割的基础上，利用每个码与其前一个码之间
的
方向变化角度值来定义码值，这样码值则集中在其中几个码元上，并采用可变长编码对形状
进行压缩，则需要的码长较短。实验表明，新算法与八方向链码相比，峰值信噪比平均提高
了1.2 dB，运行时间减少了2.1 ms。 |
| 关键词: 视频压缩 对象分割 形状编码 七方向差分链码 |
| DOI： |
|
| 基金项目:陕西省教育厅专项基金项目(07JK295) |
|
| A Seven Differential Chain Algorithm for Video Object Shape Coding |
| WANG Yan-ni,FAN Yang-yu |
| (1. School of Information and Control Engineering, Xi′an University of Architecture & Technology, Xi′an 710055, China;2.School of Electronic and Information,Northwestern Polytechnical University, Xi′an 710072, China) |
| Abstract: |
| Video object shape coding is an important part in video compression. I
n order to obtain a better reconstructed image，a seven differential chain(SDC)
algor
ithm is introduced in video object shape coding. After video object segmentation
, each code value is defined to mean the angle value of the change directio
n between the code and its former one, so the code value is concentrated in a fe
w codes. Through shape compression using variable length coding，the required co
de length is shorter. Experimen
tal results showed that the time of new algorithm is reduced 2.1 ms and P
SNR is increased about 1.2 dB,compared with the eight Freeman algorithm. |
| Key words: video compression object segmentation shape coding seven differential chain(SD
C) |
