Keywords: H.264, JM-9.3, motion estimation mode, mode decision, spatial-temporal correlation
Received August 31, 2005; revised November 24, 2005; accepted December 22, 2005.
Communicated by Jeng-Neng Hwang.
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Cheng-Chang Lien and Chung-Ping Yu
Department of Computer Science and Information Engineering
Chung Hua University
Hsinchu, 300 Taiwan
In the H.264/AVC coding standard, seven motion estimation modes from 4 ¡Ñ 4 to
16 ¡Ñ 16 are used to find the minimum motion compensation error for each macroblock.
However, the high computation cost of the full search method in the reference software
JM-9.3 makes the encoding process inefficient. Therefore, the methods of applying the
SAD (sum of absolute difference), homogeneous region analysis, and edge detection are
developed to determine the optimum motion estimation mode. Nevertheless, the additional
computation cost of image processing still reduces the efficiency of the motion
compensation process. In this paper, the spatial-temporal correlations between the current
frame and reference frame are analyzed to develop a fast mode decision method in
which no extra image processes are used. Furthermore, the concept of drift compensation
is adopted to avoid the error accumulation phenomenon during the mode decision process.
The experimental results show that the computation cost may be reduced above 60%
and the average PSNR is only dropped about 0.04db.
Received August 31, 2005; revised November 24, 2005; accepted December 22, 2005.
Communicated by Jeng-Neng Hwang.