8x8 transformation based all zero block detection for H.264/AVC encoder

By introducing all zero block (AZB) algorithm, this paper provides an easily implement solution for reducing the complexity of an 8x8 integer transform and quantization. Through the statistic analysis of all zero block for more than 30 typical sequences, We set cubic modules for threshold decision of QCIF, CIF and 720p which can almost reach 100% accuracy and averagely save 5%~40% (according to different sequences and QP values) of the 8x8 DCT and quantization calculation. Index Terms—8x8 integer transform and quantization, all zero block, H.264/AVC, sum of absolute difference (SAD).