| Type of Document |
Master's Thesis |
| Author |
Richmond II, Richard Steven
|
| Author's Email Address |
srichmond@vt.edu |
| URN |
etd-03132001-140635 |
| Title |
A Low-Power Design of Motion Estimation Blocks for Low Bit-Rate Wireless Video Communications |
| Degree |
Master of Science |
| Department |
Electrical and Computer Engineering |
| Advisory Committee |
| Advisor Name |
Title |
| Ha, Dong Sam |
Committee Chair |
| Armstrong, James R. |
Committee Member |
| Reed, Jeffrey Hugh |
Committee Member |
|
| Keywords |
- Four-step search
- Low power
- Motion estimation
- H.263
|
| Date of Defense |
2001-03-13 |
| Availability |
unrestricted |
Abstract
Motion estimation and motion compensation comprise one of the most important compression methods for video communications. We propose a low-power design of a motion estimation block for a low bit-rate video codec standard H.263. Since the motion estimation is computationally intensive to result in large power consumption, a low-power design is essential for portable or mobile systems. Our block employs the Four-Step Search (4SS) method as its primary algorithm. The design and the algorithm have been optimized to provide adequate results for low-quality video at low-power consumption. The model is developed in VHDL and synthesized using a 0.35 um CMOS library. Power consumption of both gate-level circuits and memory-accesses have been considered. Gate-level simulation shows the proposed design offers a 38% power reduction over a "baseline" implementation of a 4SS model and a 60% power reduction over a baseline Three-Step Search (TSS) model. Power savings through reduction of memory access is 26% over the TSS model and 32% over the 4SS model. The total power consumption of the proposed motion estimation block ranges from 7 - 9 mW and is dependent on the type of video being motion estimated.
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| Files |
| Filename |
Size |
Approximate Download Time
(Hours:Minutes:Seconds)
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| 28.8 Modem |
56K Modem |
ISDN (64 Kb) |
ISDN (128 Kb) |
Higher-speed Access |
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Final.pdf |
721.35 Kb |
00:03:20 |
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