A coding method for UVLC targeting efficient decoder architecture

3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the Pub Date : 2003-09-18 DOI:10.1109/ISPA.2003.1296935

Shang Xue, B. Oelmann

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引用次数: 5

Abstract

Variable length code (VLC) is used in a large variety of lossless compression applications. A specially designed VLC, called "universal variable length code" (UVLC), is utilized in the latest video coding standard H.26L under development. In this work we propose a coding method that we call "alternating coding" (ALT coding) for UVLC. An efficient UVLC decoder is designed (ALT decoder) on the basis of it. ALT coding facilitates a much easier decoding scheme for UVLC. It frees the decoder from codeword tables and the sizes of the barrel shifters are reduced. The codeword tables and barrel shifters usually occupy the largest portion of the area in the traditional VLC decoders and they are also performance limiting in terms of speed and power consumption. We compare the ALT decoder with one of the most efficient VLC decoders called "VLC decoder using plane separation" (PLS). Our results show that the ALT decoder increases 257% in speed, decreases 41% in size, and consumes 45% power of the PLS decoder.

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一种针对高效解码器结构的UVLC编码方法

可变长度码(VLC)用于各种各样的无损压缩应用。在正在开发的最新视频编码标准H.26L中，使用了一种专门设计的VLC，称为“通用变长码”(UVLC)。在这项工作中，我们提出了一种编码方法，我们称之为UVLC的“交替编码”(ALT编码)。在此基础上设计了一种高效的UVLC解码器(ALT解码器)。ALT编码为UVLC提供了一个更容易的解码方案。它将解码器从码字表中解放出来，并且减小了桶移位器的大小。在传统的VLC解码器中，码字表和桶移位器通常占据最大的面积，并且在速度和功耗方面也受到性能限制。我们将ALT解码器与最有效的VLC解码器之一进行比较，称为“使用平面分离的VLC解码器”(PLS)。我们的研究结果表明，ALT解码器的速度提高了257%，尺寸减小了41%，功耗仅为PLS解码器的45%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the

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