Optimal Denoising for Video Coding
Patent Information:
Filing Country: USA
Application No: 11/750498
Filing Date: 18 May 2007
Patent No: 8369417
Issue Date: 05 February 2013
 
Inventors:
Inventor 1: Prof. Oscar Chi Lim, AU
Inventor 2: Dr. Liwei, GUO

Technology
The importance of video technology is constantly growing with the ever-increasing use of television and video systems in consumer, commercial, medical and scientific applications. Video coding performance is becoming more and more important but the presence of noise, usually introduced by capture device, will reduce temporal redundancy among consecutive frames. This can decrease the accuracy of the motion vectors obtained in motion estimation. As a result, a lot of denoising methods have been previously proposed, such as 2-D Kalman filter, and Spatial Varying Filter (SVF). However, these filters are designed as pure pre-processing schemes independent of video coding process and are to be cascaded with the encoders. Thus, they require extra computation on top of the video encoder. The present invention proposes a new purely pre-processing denoising method named Multi-Hypothesis Motion Compensated Filter (MHMCF) which requires much fewer pixels as input and some linear operation than most existing denoising filters to achieve the same or better performance. The method is based on the temporal linear minimum mean square error (LMMSE) estimator. Another denoising method is also proposed which is named as Embedded Optimal Denoising Filter (EODF). This filter can be seamlessly embedded into motion compensation process of video encoders with nearly no extra computation introduced. As a result, the video can be highly compressed with good quality with the use of these 2 filters.
 
 
Potential Application   Advantage
- Digital signal compression, coding and representation
- Related computer program product
  1. Video noise reduced
2. Negligible computational effort introduced
3. Pure pre-processing schemes
     
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Contact information :
Ms Shirley Woo
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HKUST R and D Corporation Ltd
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香港九龍清水灣 香港科技大學
THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, CLEAR WATER BAY, KOWLOON