基于通用DSP的视频编码器量化算法研究

Quantization Scheme of a Video Encoder Based on General DSP

通过构造合适的量化矩阵,实现了快速量化;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DSP上的量化效率,而且明显改善了编码图像的主、客观质量。

Considering the traits of a DSP, an optimal quantization matrix is constructed, which can realize one-step quantization by substituting shift for division. Meanwhile, this scheme uses 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 show that this scheme can obviously improve the efficiency of quantization, and subjective and objective quality of images coded as well.