A Global-Motion-Compensation Based Video Coding Scheme and Its Application to Video Resolution Enhancement
Date Issued
2005
Date
2005
Author(s)
Li, Chia-Ying
DOI
en-US
Abstract
Global motion estimation helps in many applications. The concept of global motion compensation (GMC) has been developed in the last decade, and reaches maturity for being applied to video coding recently. On the other hand, super-resolution (SR) image reconstruction is widely used to build a high spatial resolution image through referencing a series of low-resolution (LR) images of the same scene.
In this thesis, we propose some refinements to the global motion compensation in MPEG-4 Advanced Simple Profile (ASP) for higher utilization in complex scenes. We also introduce the GMC concept into the latest video coding standard, H.264/AVC. Experiment results show that by applying our scheme, videos with apparent camera motion, i.e., pan, rotate, or zoom, are coded in a more efficient way.
On the other hand, a scheme of video resolution enhancement is proposed. It considers common camera motion and precise outlier removal which enhance the video sharpness while avoid unfavorable noise interference at the same time. Through subjective quality test, our proposed scheme outperforms the simple interpolation method and previous SR approaches.
Finally, a framework to combine GMC and SR reconstruction for video decoding applications is designed. In the proposal, most computation-intensive task is shifted to an offline encoding process. All GMC parameters are generated and embedded in the video bitstreams. Then, the major task for the decoder is simply doing the registration, whose computation is acceptable in time-constrained applications. In our experiments, the proposal can produce a high quality video up to 4 times large in each spatial dimension while just introducing an unnoticeable bitrate increase.
Subjects
全域移動補償
全域移動預測
視訊編碼
提升空間解析度
global motion estimation
global motion compensation
video coding
resolution enhancement
super-resolution image
Type
thesis
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