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Reduction Method of Added Information Generated by Increasing the Number of Quantizer Reconstruction Levels  

Wu, Ya-Lin (동의대학교 컴퓨터소프트웨어공학과)
Kwon, Soon-Kak (동의대학교 컴퓨터소프트웨어공학과)
Kwon, Oh-Jun (동의대학교 컴퓨터소프트웨어공학과)
Publication Information
Journal of Korea Multimedia Society / v.13, no.8, 2010 , pp. 1154-1162 More about this Journal
Abstract
Because it is easy to implement the scalar quantizer, it is used in various video coding systems. Although the scalar quantizer with a large quantization stepsize can reduce the amount of data, it has disadvantage that the reconstructed picture quality is poor. In this paper, we propose an efficient method which improves the coding performance by maintaining original quantization stepsize and increasing the number of quantization reconstruction levels. Simultaneously, for the purpose of solving the problem of transmitting the added symbol informations which is used to indicate the region of quantizer reconstruction level as the number of quantizer reconstruction level is increased, we also suggest the method to reduce the added informations. Therefore, for the intra-coded picture of H.264 video coding system, we generate the huffman codes for the symbol informations of quantization reconstruction regions by 4${\times}$4(horizontal 4 pixels, vertical pixels) block unit. Furthermore, for the inter-coded picture, we also generate the huffman codes for the symbol informations of quantization reconstruction regions by 8${\times}$8 blocks and 4${\times}$4 blocks within a macroblock. Adopting this method of reducing the added information by increasing the number of quantization reconstruction region, It is shown that the coding performance can be improved at the same bitrate.
Keywords
H.264 Video Coding; Quantization; Additional Information;
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