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8 February 2005 Sequence image coding rate control strategy based on the distribution character of DCT coefficients
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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.
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Xiaohui Li, Lan Chen, and Hongyu Fang "Sequence image coding rate control strategy based on the distribution character of DCT coefficients", Proc. SPIE 5637, Electronic Imaging and Multimedia Technology IV, (8 February 2005); https://doi.org/10.1117/12.566446
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