Distributed Video Coding Using JPEG2000 Coding Scheme(Image,<Special Section>Multimedia and Mobile Signal Processing)

概要

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Distributed Video Coding (DVC), based on the theorems proposed by Slepian-Wolf and Wyner-Ziv, is attracting attention as a new paradigm for video compression. Some of the DVC systems use intraframe compression based on discrete cosine transform (DCT). Unfortunately, conventional DVC systems have low affinity with DCT. In this paper, we propose a wavelet-based DVC scheme that utilizs current JPEG2000 standard. Accordingly, the scheme has scalability with regard to resolution and quality. In addition, we propose two methods to increase the coding gain of the new DVC scheme. One is the introduction of a Gray code, and the other method involves optimum quantization. An interesting point is that though our proposed method uses Gray code, it still achieves quality scalability. Tests confirmed that the PSNR is increased about 5[dB] by the two methods, and the PSNR of the new scheme (with methods) is about 1.5-3[dB] higher than that of conventional JPEG2000.
2007-03-01