Modified adaptive scan pattern for quantized coefficients

Scan patterns for quantized coefficients that are intra predicted are needed to improve the efficiency of entropy coding. Therefore, various scanning algorithms have been proposed. In this paper, a modified adaptive scan pattern algorithm is proposed. A new scanning pattern can achieve an entropy coding gain in intra coding by updating the zero-counter and scan pattern at every macroblock. Experimental results show that the proposed algorithm can reduce the bit-rate about 2.23% as compared with H.264/AVC and 0.49% as compared with Yoo's algorithm.