Image analysis – Image enhancement or restoration – Image filter
Reexamination Certificate
2006-07-11
2006-07-11
Mehta, Bhavesh M. (Department: 2625)
Image analysis
Image enhancement or restoration
Image filter
C382S226000, C382S232000, C348S666000, C348S420100, C375S240200, C375S240240, C358S462000
Reexamination Certificate
active
07076113
ABSTRACT:
An efficient and non-iterative post processing method and system is proposed for mosquito noise reduction in DCT block-based decoded images. The post-processing is based on a simple classification that segments a picture in multiple regions such as Edge, Near Edge, Flat, Near Flat and Texture regions. The proposed technique comprises also an efficient and shape adaptive local power estimation for equivalent additive noise and provides simple noise power weighting for each above cited region. An MMSE or MMSE-like noise reduction with robust and effective shape adaptive windowing is utilized for smoothing mosquito and/or random noise for the whole image, particularly for Edge regions. Finally, the proposed technique comprises also, for chrominance components, efficient shape adaptive local noise power estimation and correction.
REFERENCES:
patent: 5237410 (1993-08-01), Inoue
patent: 5329311 (1994-07-01), Ward et al.
patent: 5400082 (1995-03-01), Kamiya
patent: 5610729 (1997-03-01), Nakajima
patent: 5852475 (1998-12-01), Gupta et al.
patent: 5920356 (1999-07-01), Gupta et al.
patent: 6064776 (2000-05-01), Kikuchi et al.
patent: 6577679 (2003-06-01), Apostolopoulos
patent: WO 02/01855 (2002-01-01), None
Sun X Z et al: “Adaptive Filters Based on Local Estimates”, 1988 IEEE International Symposium on Circuits and Systems. Proceedings (Cat. No. 88CH2458-8), Espoo, Finland, Jun. 7-9, 1988, pp. 2549-2552 vol. 3, XP01069435 1988, New York, NY, USA, IEEE, USA. Abstract.
Lee Y-L et al: “Loop Filtering and Post-Filtering for Low-Bit-Rates Moving Picture Coding”. Signal Processing, Image Communication, Elsevier Science Publishers, Amsterdam, the Netherlands, vol. 16, No. 9, Jun. 2001, pp. 871-890, XP004245273. ISSN: 0923-59652. p. 883, para. 3.3.2.
Bhaskar Ramamurthi et al: “Nonlinear Space-Variant Postprocessing of Block Coded Images”, IEEE Transactions on Acoustics, Speech and Signal Processing, IEEE Inc. New York, U.S., vol. 34, No. 5, Oct. 1, 1986, pp. 1258-1268, XP00349257. ISSN 0096-3518. Whole document.
Lee J-S: “Digital Image Smoothing and the Sigma Filter”. Computer Vision Graphics and Image Processing, Academic Press, Duluth, MA, U.S., vol. 24, 1983, pp. 255-269, XP000199489. Whole document.
Chawan Sheela
Miranda Technologies Inc.
Ogilvy Renault LLP
LandOfFree
Apparatus and method for adaptive spatial segmentation-based... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for adaptive spatial segmentation-based..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for adaptive spatial segmentation-based... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3552986