A Novel Mode Selection Algorithm for H.264 Inter Frames
Cai An-ni · Beijing Youdian Xueyuan xuebao · 2007
The suitable mode-class is adaptively selected for the current macroblock(MB) based on the context of encoded MB-modes in the spatiotemporal neighborhoods of the previous and current H.264 video frames.Two matrixes which are composed of sum of absolute values of the integer transform coefficients in 4×4-residual-block contained in luminance 16×16-block and 8×8-block are defined respectively,the novel MB and sub-MB mode selection criteria which use the derived gradients of the two matrixes are then proposed.Experiments show that the proposed algorithm can averagely save about 11% and 7% encoding time compared to joint video team(JVT)-J033 and JVT-K021 respectively with almost no rate distortion efficiency degradation.