摘要： 针对MPEG-4 实现中算术编码器的计算瓶颈，在算法上对原始Q-coder 编码的进位翻转问题和移位加方法进行改进，大大提高了编码效率。针对二值形状视频对象编码消耗大量资源的特点，提出一种高效的实现CAE 的VLSI 结构。在内部采用了一种延迟缓冲线机制保存输入的像素，每个时钟输出相应模板的内容，同时最大限度地安排要重复使用的像素。

关键词: MPEG-4；形状编码；基于内容的算术编码；延迟缓冲线

Abstract: This paper focuses on the computational bottleneck of arithmetic coding in MPEG-4. It improves the original Q-coder by modified shift-and-add scheme, with the consideration of carry-over problem. In order to get better coding efficiency, a high efficient VLSI structure of CAE is proposed to resolve the high resources consumption problem. It embeds a delay-line buffer in it to store the input pixels, thus it can directly output pixels according to the specific template, reuse data maximally

Key words: MPEG-4; Shape coding; CAE; Delay-line buffer