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A differential image quantizer based on wavelet for low bit rate video coding  

주수경 (광운대학교 전자공학과 디지털미디어 연구실)
유지상 (광운대학교 전자공학과 디지털미디어 연구실)
Publication Information
Journal of Broadcast Engineering / v.8, no.4, 2003 , pp. 473-480 More about this Journal
Abstract
In this paper, we propose a new quadtree coding a1gorithm to improve the performance of the old one. The new algorithm can process any frame of size in standard and reduce encoding and decoding time by decreasing computational load. It also improves the image quality comparing with any old quantizer based on quadtree and zerotree structure. In order for the new algorithm to be applied for real video codec, we analyze the statistical characteristics of coefficients of differential image and add a function that makes It deal with an arbitrary size of image by using new technique while the old one process by block unit. We can also improve the image quality by scaling the coefficient's value from a differential image. By comparing the performance of the new algorithm with quadtree and SPIHT, it Is shown that PSNR is improved, that the computational load is not reduced in encoding and decoding.
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