New adaptive interpolation schemes for efficient meshbased motion estimation
Motion estimation and compensation is an essential part of existing video coding systems. The mesh-based motion estimation (MME) produces smoother motion field, better subjective quality (free from blocking artifacts), and higher peak signal-to-noise ratio (PSNR) in many cases, especially at low bit...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Iran University of Science and Technology
2005-04-01
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| Series: | Iranian Journal of Electrical and Electronic Engineering |
| Subjects: | |
| Online Access: | http://ijeee.iust.ac.ir/browse.php?a_code=A-10-3-42&slc_lang=en&sid=1 |
| Summary: | Motion estimation and compensation is an essential part of existing video coding
systems. The mesh-based motion estimation (MME) produces smoother motion field, better
subjective quality (free from blocking artifacts), and higher peak signal-to-noise ratio
(PSNR) in many cases, especially at low bitrate video communications, compared to the
conventional block matching algorithm (BMA). However, the iterative refinement process
of MME is computationally much costly and makes the method impractical in real- (or near
real-) time systems. Also, eliminating the iterative refinement step deteriorates the motion
estimation result. In this paper, we propose motion adaptive interpolation schemes for noniterative
MME, which use BMA to compute the motion vectors (MVs) of mesh nodes. The
proposed algorithm aims at compromising the MME and BMA by modifying the
interpolation patterns (IPPs) of the MME in an adaptive manner, based on the MVs of
mesh nodes. Experimental results show notable rate-distortion improvement over both
BMA and conventional non-iterative MME, with acceptable visual quality and system
complexity, especially when applied to sequences with medium to high motion activities. |
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| ISSN: | 1735-2827 2383-3890 |