Abstract
An increasing demand for mobile video recording systems makes it important to reduce power consumption and to increase battery lifetime. The H.264/AVC compression is widely used for many video recording systems because of its high compression efficiency; however, the complex coding structure of H.264/AVC compression requires large power consumption. A light-weight video compression (LWC), based on discrete wavelet transform and set partitioning in hierarchical trees, consumes less power than H.264/AVC compression thanks to its relatively simple coding structure, although its compression efficiency is lower than that of H.264/AVC compression. This paper proposes a low-power video recording system that combines both the H.264/AVC encoder with high compression efficiency and LWC with low power consumption. The LWC is used to compress video data for temporal storage while the H.264/AVC encoder is used for permanent storage of data when some events are detected. For further power reduction, a down-sampling operation is utilized for permanent data storage. For an effective use of the two compressions with the down-sampling operation, an appropriate scheme is selected according to the proportion of long-term to short-term storage and the target bitrate. The proposed system reduces power consumption by up to 72.5% compared to that in a conventional video recording system.
Original language | English |
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Article number | 7399420 |
Pages (from-to) | 603-613 |
Number of pages | 11 |
Journal | IEEE Transactions on Multimedia |
Volume | 18 |
Issue number | 4 |
DOIs | |
State | Published - Apr 2016 |
Bibliographical note
Publisher Copyright:© 2016 IEEE.
Keywords
- Down-sampling
- H.264/AVC compression
- lightweight compression (LWC)
- low power implementation
- multi operation modes
- multi video codec
- video recording system (VRS)