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Motion estimation (ME) is the most computation- and power-demanding module of portable video coding owing to the numerous calculations of rate–distortion (R-D) optimization operation and a large number of frame memory access. Nevertheless, how to minimize the power consumption of this component is the main research topic with regard to the H.264/AVC video coding standard. More severe problems arose in the latest video coding standard, called high-efficiency video coding (HEVC) because of the more R-D calculations and frame data access owing to utilization of larger block sizes and numerous block partitions for better coding bit-rate reduction than H.264/AVC. Accordingly, in this paper, we introduce a bandwidth-adjustable ME design, which is capability of not only awareness of bus bandwidth change but lower memory access times. Compared with the HEVC test model (HM-16.6), the proposed algorithm can save memory access under the common test conditions with negligible rate-distortion degradation.

A Bandwidth-Adjustable Motion Estimation Design for Portable Video Coding