Optical EngineeringFuzzy approach to controlling the bit rate for pre-encoded video in the discrete cosine transform domain
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We propose a fuzzy method to control the bit rate in the discrete cosine transform (DCT) domain. The method consists of a bit-rate allocation with fuzzy measures and a least-distortion bit-rate reduction. Fuzzy measures are calculated from the code length, the discontinuity ambiguity, and the neighborhood momentum in each DCT block. These measures are summed with weights and form a reduction fuzziness to indicate the degree of preferable reduction. Using the reduction fuzziness, each DCT block is filtered by the least-distortion reduction method to adjust the bit rate for the target bandwidth. In an experiment, we show that the video quality transcoded by the method is better and the bandwidth is more regular than with existing methods, both visually and quantitatively.