Efficient Rate Allocation for Multi-Resolution Coding of Data
Patent Information:
Filing Country: USA
Application No: 12/638225
Filing Date: 15 December 2009
Patent No: 7970224
Issue Date: 28 June 2011
 
Inventors:
Inventor 1: Prof. Oscar Chi Lim, AU
Inventor 2: Mr. Yick Ming, YEUNG

Technology
JPEG2000, a newly developed international standard for still image compression. It can provide superior objective and subjective image quality and can reduce file size by 40% compared with JPEG while retaining the same visual quality. Rate control or rate allocation is of great necessity to control the birate of image/video coding. A new and useful rate control scheme for JPEG2000 image coding, namely Successive Bit-plane Rate Allocation(SBRA), that can reduce the computation and memory requirement significantly, is highly suitable for real-time low-delay applications such as digital cameras. The proposed scheme uses only the currently available rate-distortion information to control the birate instead of using rate-distortion of whole image and can obtain an image quality close to the optimal truncation. Without the need of future rate-distortion slope information, the proposed casual scheme can be done in real-time with minimal delay such that part of the data can be sent out during the encoding process. This is very useful especially for the progressive transmission in JPEG2000 without long delay. JPEG2000 is the main application for the proposed fast rate control scheme. However, it can also be applied to any other multi-resolution image/video coding system.
 
 
Potential Application   Advantage
- Digital cameras, digital camcorders, PDAs, multimedia-enabled cellular phones (2.5G, 3G and beyond), wireless LAN devices, bluetooth applications, webservers, internet applications, scanners, remote sensing, etc.   1. It can be done sequentially resulting in effectively zero delay
2. Easy algorithm and thus low computation complexity with essentially zero memory requirement
     
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Contact information :
Ms Shirley Woo
(852) 2358 7918
cawoosw@ust.hk
HKUST R and D Corporation Ltd
http://rdc.ust.hk
(852) 2358 7917
ttcac@ust.hk
Technology Transfer Center
http://www.ttc.ust.hk/
   
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