Description: In this paper, the image layer and macroblock layer rate control of H.263. In the image layer to the adaptive control approach, through the introduction of quantization step size factor- encoding bits output mapping table to identify each frame image quantization step size factor of the reference value. In the macroblock layer to control the use of the former method, in accordance with the design of visual masking properties of fuzzy classifier to determine the human eye to each macroblock and the corresponding sensitivity of the quantization step size factor. Video output at a constant bit-rate conditions, to maintain the stability of image quality and achieved better visual effect.
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