嵌入式视频编码器量化算法优化

Qptimization design of video encoder quantizer for general DSPs

通过构造合适的量化矩阵,实现了快速量化,解决了通用嵌入式处理器实现视频压缩标准量化算法存在效率差、量化器结构复杂等问题;同时,对不同的视频编码块类型,采用不同的量化策略,避免了统一量化引起的图像质量下降。实验结果表明:不仅提高了编码器在通用嵌入式处理器上的量化效率,而且明显改善了编码图像的主、客观质量。

A new scheme of quantization which was constructed by an optimal quantization matrix was proposed. It was inefficient for the traditional quantization of MPEG video encoders on the general DSPs. Considering the traits of a DSP, which could realized one-step quantization by substituting shift for division. Meanwhile, this scheme used different quantization strategies according to the differences of the types of video blocks to be coded, and avoids the loss of the quality of images with the unified quantization. Experiments had shown that this scheme could obviously improve the efficiency of quantization, and subjective and objective quality of images coded as well.