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- W2129467389 abstract "The complexity of the MPEG video coding standard makes it a challenging task to provide simple strategies to tune the coder parameters in order to produce consistent quality images for a given bit budget. Pre-quantization and pre-coding of individual frames have been proposed in the literature as a viable solution to the problem. In this paper, we show that a simple statistical model for the DCT coefficients can be used to select quantization parameters at the macroblock level. In particular, 8/spl times/8 blocks of DCT coefficients are modelled as i.i.d. random vectors of independent variables. The rate-distortion performance associated to a given quantizer can be calculated from the model and the quantizer parameters can be locally controlled to meet the specified rate-distortion target. The experimental results show that, with a limited complexity, it is possible to achieve a great precision in the bit rate control without actual pre-coding." @default.
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- W2129467389 date "2002-11-23" @default.
- W2129467389 modified "2023-09-25" @default.
- W2129467389 title "Accurate bit-rate and quality control for the MPEG video coder" @default.
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- W2129467389 doi "https://doi.org/10.1109/icip.1997.632185" @default.
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