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Proceedings Paper

Sequence image coding rate control strategy based on the distribution character of DCT coefficients
Author(s): Xiaohui Li; Lan Chen; Hongyu Fang
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Paper Abstract

The strategy of sequence image coding rate control by picture layer and mcroblock is proposed in this paper. Rate control on picture layer actually allocates a number of target bits for current frame to be encoded. Based on this number, a reference quantization parameter is selected on picture layer. In the course of determining the quantization step of every macroblock in a frame, the characteristics of an image itself should be fully considered. The characteristic of the image by the distribution characteristics of the DCT coefficients is denoted and a best quantization parameter for every macroblock in a frame is selected. The complexity of the algorithm is analyzed and an improved method is proposed. The experiment shows that the rate control strategy proposed in this paper can effectively reduce and avoid the overflow and underflow of the encoder buffer, and the output bit rates tend to stabilization. The peak signal-to-noise ratio (PSNR) of the reconstructed image is raised.

Paper Details

Date Published: 8 February 2005
PDF: 5 pages
Proc. SPIE 5637, Electronic Imaging and Multimedia Technology IV, (8 February 2005); doi: 10.1117/12.566446
Show Author Affiliations
Xiaohui Li, Anhui Univ. (China)
Lan Chen, Anhui Univ. (China)
Hongyu Fang, Anhui Univ. (China)

Published in SPIE Proceedings Vol. 5637:
Electronic Imaging and Multimedia Technology IV
Chung-Sheng Li; Minerva M. Yeung, Editor(s)

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