Efficient requantization method for INTRA MB in heterogeneous transcoding

Kwang-deok Seo; Jae-Kyoon Kim; Kook-yeol Yoo; Yoon-Soo Kim

doi:10.1117/12.411787

29 December 2000 Efficient requantization method for INTRA MB in heterogeneous transcoding

Kwang-deok Seo, Jae-Kyoon Kim, Kook-yeol Yoo, Yoon-Soo Kim

Proceedings Volume 4310, Visual Communications and Image Processing 2001; (2000) https://doi.org/10.1117/12.411787
Event: Photonics West 2001 - Electronic Imaging, 2001, San Jose, CA, United States

Abstract

In this paper, we propose an efficient requantization method for INTRA Macroblocks (MB) in heterogeneous transcoding MPEG-1 to MPEG-4 simple profile. The quantizer for MPEG-1 INTRA MB usually uses a quantization matrix while the quantizer for MPEG-4 simple profile doesn't. As a result, the quantization step sizes of the two quantizers may not be the same even for the same quantization parameter. Due to this mismatch in the quantization step size, the transcoded MPEG-4 sequence suffers serious quality degradation and the number of bits produced by transcoding increases from the original MPEG-1 video sequence. To solve these problems, we propose an efficient method to find a near-optimum reconstruction level in the transcoder. We also present a PDF (probability distribution function) estimation model for the original DCT coefficients of MPEG-1 video sequence, which is required for the proposed requantization. Experimental results show that the proposed method gives 0.3 to approximately 0.7 dB improvement in PSNR over the conventional method, even at the reduced bit-rate about 5 to approximately 7% from the conventional method.

Citation Download Citation

Kwang-deok Seo, Jae-Kyoon Kim, Kook-yeol Yoo, and Yoon-Soo Kim "Efficient requantization method for INTRA MB in heterogeneous transcoding", Proc. SPIE 4310, Visual Communications and Image Processing 2001, (29 December 2000); https://doi.org/10.1117/12.411787

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KEYWORDS

Quantization

Video

Curium

Video coding

Computer programming

Reliability

Statistical analysis

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