Optimized Design of Entropy Encoder of Block Transform Coefficients of AVS Video Coding Standard
Yü Liu · Microelectronics & Computer · 2004
This paper discusses the entropy coding technique of block transform coefficients of the video section of National Audio and Video Coding Standard of China. First, the coding procedure of current entropy encoder (AVS_VLC) of AVS is introduced. Then the problems existed in AVS_VLC such as differences of coding efficiency at different bit rates and mismatching with transform and quantization modules are analyzed. The paper proposed a new entropy encoder design combining mechanisms of QP range division and VLC sub tables switch. The new entropy encoder has high efficiency over AVS_VLC at all 3 bit rate sections and has an average gain of 0.1548dB at QCIF sequence test. The gain at low bit rate section is 0.3211dB, which is most significant. So the new entropy encoder has more advantages over AVS_VLC in the low bit rate wireless communication applications.