title: High-Performance Motion Estimation for Image Sensors with Video Compression.
abstract: It is important to reduce the time cost of video compression for image sensors in video sensor network. Motion estimation (ME) is the most time-consuming part in video compression. Previous work on ME exploited intra-frame data reuse in a reference frame to improve the time efficiency but neglected inter-frame data reuse. We propose a novel inter-frame data reuse scheme which can exploit both intra-frame and inter-frame data reuse for ME in video compression (VC-ME). Pixels of reconstructed frames are kept on-chip until they are used by the next current frame to avoid off-chip memory access. On-chip buffers with smart schedules of data access are designed to perform the new data reuse scheme. Three levels of the proposed inter-frame data reuse scheme are presented and analyzed. They give different choices with tradeoff between off-chip bandwidth requirement and on-chip memory size. All three levels have better data reuse efficiency than their intra-frame counterparts, so off-chip memory traffic is reduced effectively. Comparing the new inter-frame data reuse scheme with the traditional intra-frame data reuse scheme, the memory traffic can be reduced by 50% for VC-ME.
authors: Institute of Microelectronics, Tsinghua University, Beijing 100084, China. weizhixu@gmail.com.|School of Information Science and Engineering, Shandong Normal University, Jinan 250014, China. weizhixu@gmail.com.
authors: Weizhi
authors: W
authors: Xu
authors: Institute of Microelectronics, Tsinghua University, Beijing 100084, China. yinsy@tsinghua.edu.cn.
authors: Shouyi
authors: S
authors: Yin
authors: Institute of Microelectronics, Tsinghua University, Beijing 100084, China. liulb@tsinghua.edu.cn.
authors: Leibo
authors: L
authors: Liu
authors: State Key Laboratory for Computer Architecture, Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100190, China. zyliu@ict.ac.cn.
authors: Zhiyong
authors: Z
authors: Liu
authors: Institute of Microelectronics, Tsinghua University, Beijing 100084, China. wsj@tsinghua.edu.cn.
authors: Shaojun
authors: S
authors: Wei
keywords: data reuse; full search; image sensors; inter-frame; memory bandwidth; motion estimation; video compression