Abstract
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.
Highlights
Giving the rising trend of high-definition (HD) video services for mobile terminals, the previous video coding standard, called H.264/AVC[1], cannot meet the current coding requirement because coding bit-rate reduction is the most important design aims
high-efficiency video coding (HEVC) provides quadtree-based structure defined as coding tree unit (CTU) to code a frame, and the CTU can be split into small coding unit (CU) based on video coding contents
While CU settings chosen, the corresponding CU size can be further partitioned into small prediction unit (PU) for mode decision of inter or intra prediction
Summary
Giving the rising trend of high-definition (HD) video services for mobile terminals, the previous video coding standard, called H.264/AVC[1], cannot meet the current coding requirement because coding bit-rate reduction is the most important design aims. The emerging video coding standard HEVC[2] provides almost the 50% bit-rate reduction[3] than H.264/AVC due to the abundant coding tools. HEVC provides both symmetric and asymmetric PU partition size from 64 × 64 down to 4 × 4 Owing to such a variety of CU block size and PU partition size settings, the coding complexity for mode decision of rate-distortion cost calculations in HEVC are more complicated than in H.264/AVC, especially on ME of inter prediction. TZ search comprises with diamond search pattern and raster search to decrease computational complexity and speed up coding time Another search scheme of ME was provided by adopting initial search center form origin to AMVP. We are interested in developing a low-memory access ME algorithm and simultaneously awareness of memory bandwidth variation for HEVC.
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