Efficient Multi-Frame Motion Estimation for Video Compression用於視頻壓縮的高效多參考幀運動估值
Due to huge size of the raw digital video data (or image sequences), compression must be applied such data so that they may be transmitted and stored. There have been many important video compression standards, including the ISO/IEC MPEG-1, MPEG-2, MPEG-4 standards and the ITU-T H.261, H.263, H.263+, H.263++, H.264 standards.
In particular, H.264 allows the encoder to store five reference pictures for motion estimation (ME) and motion compensation (MC). However, the processing time increases linearly with the number of reference pictures used.
A novel fast multi-frame selection scheme has been developed. It significantly reduces computational cost while achieving similar visual quality and bit-rate as the full selection. It seeks to provide new and useful multi-frame motion estimation techniques for any current frame in H.264 or MPEG-4 AVC or AVS or related video coding. Instead of searching through all the possible reference frames, the proposed scheme tries to select only a few representative frames for motion estimation. This is very useful for real-time applications.
Moreover, the present invention in any of its aspect is applicable to, but not limited to the encoding of audio signals, speech signals, video signals, seismic signals, medical signals.
1. Fast processing time and quick response using the multi-frame selection scheme
2. Computational cost is reduced while achieving similar visual quality and bit-rate as the full selection process
3. Reduce temporal redundancy in video sequences
- digital cameras, digital camcorders, digital video recorders
- set-top boxes
- personal digital assistants (PDA)
- multimedia-enabled cellular phones (2.5G, 3G, and beyond)
- video conferencing systems, video-on-demand systems
- wireless LAN devices
- bluetooth applications
- web servers, video streaming server in low or high bandwidth applications
- video transcoders (converter from one format to another)
- other visual communication systems
Patent Number: US7720148B2
Application Number: US200590373A
Inventor: Au, Oscar Chi-Lim | Chang, Andy
Priority Date: 26 Mar 2004
Priority Number: US7720148B2
Application Date: 25 Mar 2005
Publication Date: 18 May 2010
IPC Current: H04N000712 | H04N000736
US Class: 37524012 | 37524013 | 37524016 | 37524017
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Efficient multi-frame motion estimation for video compression
Usefulness: Efficient multi-frame motion estimation for video compression
Summary: Used for matching an image object against a set of reference image objects in a video compression.
Novelty: Image object matching method for use in video compression, involves defining regions in image object, and defining corresponding representative coordinate for each region in image object
信息和通信技術/電信
圖像處理
25 Mar 2005
US 11/090373
US 7720148
TTC.PA.221S
香港
