A fast adaptive quantization matrix selection method in H.264/AVC

Adaptive quantization matrix selection (AQMS) method was recently proposed in ITU-T VCEG to improve video coding performance. As a reference model for VCEG, this method involves coding a frame multiple times to obtain optimal candidate matrix parameters. In this paper, the method in AQMS is analyzed and an fast adaptive quantization matrix selection method is proposed. The proposed method keeps the quantization matrix selection in the macroblock level but removes the iterative quantization matrix parameter calculation in the frame level. Therefore, computational complexity is greatly reduced while the coding gain is maintained.