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先分析了当前低比特率编码中的码率控制策略及存在的问题 ,接着为码率控制问题建立了相应的数学模型 ,然后以此为基础提出了一种低码率传输的新的控制策略 ,最后在计算机模拟实验中选用“Trevor”序列对该方法和传统的码率控制策略 RM8方法进行了比较。结果表明 ,平均信噪比提高了 0 .86 d B,恢复后的图象质量也有明显改善。
At first, the rate control strategy and its existing problems in the current low bit rate coding are analyzed. Then the corresponding mathematical model is established for the rate control problem. Based on this, a new control strategy of low bit rate transmission Finally, the “Trevor” sequence was chosen in computer simulation to compare the proposed method with the traditional rate control strategy RM8. The results show that the average signal to noise ratio increased by 0.86 d B, after the restoration of the image quality has also been significantly improved.