Image analysis – Image compression or coding – Adaptive coding
Reexamination Certificate
2007-08-21
2007-08-21
Chen, Wenpeng (Department: 2624)
Image analysis
Image compression or coding
Adaptive coding
C382S251000
Reexamination Certificate
active
10263653
ABSTRACT:
Further compression of data allowing economical storage of data for extended periods of time in high-speed access memory is performed in reduced time by performing further compression during transcoding in the transform domain and without restoring image data to its original image data form. The reduction in processing time is achieved by exploiting the large number of zero-valued quantization transform coefficients and not changing quantized transform coefficients at zig-zag scan positions where non-zero coefficients are rare during range reduction of the entropy decoded quantized transformed data. The range can be restored by computation or estimation of an altered quantization table which is stored with the further compressed a quantization values. Further advantages accrue from use of JPEG packed format for the data during transcoding.
REFERENCES:
patent: 5339368 (1994-08-01), Higgins-Luthman
patent: 5583656 (1996-12-01), Gandhi et al.
patent: 5666161 (1997-09-01), Kohiyama et al.
patent: 5699458 (1997-12-01), Sprague
patent: 5724453 (1998-03-01), Ratnakar et al.
patent: 5774597 (1998-06-01), Wilson
patent: 5991451 (1999-11-01), Keith et al.
patent: 603137 (2000-02-01), Graffagnino
patent: 6118820 (2000-09-01), Reitmeier et al.
patent: 6141452 (2000-10-01), Murao
patent: 6167161 (2000-12-01), Oami
patent: 6182034 (2001-01-01), Malvar
patent: 6195465 (2001-02-01), Zandi et al.
patent: 6195466 (2001-02-01), Schwartz et al.
patent: 6526099 (2003-02-01), Christopoulos et al.
patent: 6606418 (2003-08-01), Mitchell et al.
patent: 6658161 (2003-12-01), Chen et al.
patent: 6941019 (2005-09-01), Mitchell et al.
patent: 6950463 (2005-09-01), Moni et al.
patent: 2003/0044076 (2003-03-01), Mitchell et al.
PCT International Search Report dated Jun. 30, 2004.
Prakesh et al. XP-002280411“ Enhanced JPEG-Compression of Documents” 2001 IEEE International Conference on Image Processing. Oct. 7, 2001; pp. 494-497.
Ricardo L. de Queiroz XP-00786795 “Processing JPEG-Compressed Images and Documents” IEEE Transactions on Image Processing, vol. 7, No. 12; Dec. 1, 1998.
Syin Chan XP-002280412 “Recompression of Still Images” Internal Report University of Kent, pp. 1-41; Mar. 1992.
Smith et al. XP004419658 “Compressed Domain of JPEG-Encoded Images” Real-Time Imaging, Academic Press Limited vol. 2, No. 1; pp. 3-17, Feb. 1996.
“Digital Compression and Coding of Continuous-Tone Still Images Part I: Requirements and Guidelines Appendix”A XP-00102358; pp. 337-339-369,371-379,381-403,405-475,477,537,539-543.
Copyright 1999 IEEE Low Cost Video Compression using Fast, Modified Z-Coding of Wavelet Pyramids.
Paper from the University of Aahus for Real-Time Software Video Codec based on Wavelets.
Mitchell Joan L.
Prakash Ravi
Chen Wenpeng
Ge Yuzhen
International Business Machines - Corporation
Lashmit Douglas A.
Whitham Curtis Christofferson & Cook PC
LandOfFree
Enhancing compression while transcoding JPEG images does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Enhancing compression while transcoding JPEG images, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Enhancing compression while transcoding JPEG images will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3854600