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首页> 外国专利> A RATE-CONTROLLED DIGITAL VIDEO EDITING METHOD AND SYSTEM WHICH CONTROLS BIT ALLOCATION OF A VIDEO ENCODER BY VARYING QUANTIZATION LEVELS

A RATE-CONTROLLED DIGITAL VIDEO EDITING METHOD AND SYSTEM WHICH CONTROLS BIT ALLOCATION OF A VIDEO ENCODER BY VARYING QUANTIZATION LEVELS

机译：一种通过改变量化水平来控制视频编码器的位分配的速率控制数字视频编辑方法和系统

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A method and system for re-encoding frames of a digital video stream withoutchanging the previouslycalculated bit length of the stream. A set of macroblocks at a time are re-encoded (292), the number ofresulting bits is calculated (306, 368) and the deviation from an estimatednumber of bits is calculated (372),either set-by-set or cumulatively. Based on the accuracy (372), of theestimate (422) and the remainingnumber of sets of macroblocks (424) to re-encode, a correction factor (710)for the quantization level of thenext set of macroblocks is chosen from a lookup table. The correction factoris added to the quantizationlevel of the next set of macroblocks (712) and the results stored as the newquantization level of the set(706). This sequential process is done for all sets of macroblocks in thedigital stream which are to berecorded according to changed image qualities (706. 708. 710. 712. 714).
机译：一种无需重新编码数字视频流的帧的方法和系统改变以前计算的流的位长。一次重新设置一组宏块编码（292），计算得到的位（306、368）以及与估计的偏差计算位数（372），逐个设置或累计设置。基于精度（372）估计（422），其余要重新编码的宏块集合数（424），校正因子（710）为的量化水平从查找表中选择下一组宏块。校正系数被添加到量化下一组宏块的级别（712），结果存储为新的宏块集合的量化级别（706）。该顺序过程是针对将要的数字流根据更改的图像质量进行录制（706. 708. 710. 712. 714）。

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