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Sensors 2015, 15(8), 20752-20778; doi:10.3390/s150820752

High-Performance Motion Estimation for Image Sensors with Video Compression

1
Institute of Microelectronics, Tsinghua University, Beijing 100084, China
2
School of Information Science and Engineering, Shandong Normal University, Jinan 250014, China
3
State Key Laboratory for Computer Architecture, Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100190, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio Passaro
Received: 29 June 2015 / Revised: 5 August 2015 / Accepted: 13 August 2015 / Published: 21 August 2015
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [949 KB, uploaded 21 August 2015]   |  

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. View Full-Text
Keywords: memory bandwidth; image sensors; video compression; motion estimation; full search; inter-frame; data reuse memory bandwidth; image sensors; video compression; motion estimation; full search; inter-frame; data reuse
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Xu, W.; Yin, S.; Liu, L.; Liu, Z.; Wei, S. High-Performance Motion Estimation for Image Sensors with Video Compression. Sensors 2015, 15, 20752-20778.

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