Image analysis – Image enhancement or restoration – Edge or contour enhancement
Patent
1994-11-14
1996-12-31
Boudreau, Leo
Image analysis
Image enhancement or restoration
Edge or contour enhancement
382254, 382276, G06K 940
Patent
active
055902227
ABSTRACT:
A technique for processing a decoded image signal having a distortion obtained by decoding coded data by utilizing a two-dimensional inverse orthogonal transformation in which the coded data is obtained by coding an image signal by utilizing a two-dimensional orthogonal transformation. At least one correction block is constructed each including a plurality of pixels from a plurality of coded blocks from the decoded image signal and having a distortion on at least one boundary therebetween. The coded blocks of each correction block are adjacent to one another. A two-dimensional orthogonal transformation of each the correction block is performed by utilizing a Haar function so as to form a plurality of coefficients including higher-order side coefficients, lower-order side coefficients and a dc coefficient. A correction value is added to the higher-order side coefficients in accordance with a predetermined number of the lower-order side coefficients when the predetermined number of the lower-order side coefficients have values other than zero so as to form a correction coefficient signal for each correction block. A two-dimensional inverse orthogonal transformation is performed on the correction coefficient signal of each correction block by utilizing the Haar function so as to obtain a smoothed image signal in which each distortion on each boundary of the coded blocks has been smoothed.
REFERENCES:
patent: 4261043 (1981-04-01), Robinson et al.
patent: 5293415 (1994-03-01), Hartley et al.
patent: 5384849 (1995-01-01), Jeong
patent: 5454051 (1995-09-01), Smith
Transactions of the Institute of Electronics, Information and Communication Engineers A, Feb. 1988, Japan, vol. J71A, No. 2, ISSN 0373-6091, pp. 481-487, Wu Z et al. `Modified block transform coding of images`.
Visual Communications and Image Processing, Cambridge, MA, USA, 15-16 Sep. 1986, vol. 707, ISSN 0277-786X, Proceedings of the SPIE-the International Society for Optical Engineering, 1986, USA, pp. 182-187, TRAN A `Block-effect reduction in transform coding`.
Journal of Electronic Imaging, Apr. 1992, USA, vol. 1, No. 2, ISSN 1017-9909, pp. 183-191, Avril C et al. `Linear filtering for reducing blocking effects in orthogonal transform image coding`.
European Transactions on Telecommunications and Related Technologies, May-Jun. 1992, Italy, vol. 3, No. 3, pp. 265-274, Albanesi M G et al. `Image compression by the wavelet decomposition`.
Patent Abstracts of Japan vol. 017 No. 508 (E-1431), 13 Sep. 1993, JP-A-05 130424 (Sony Corp) 25 May 1993, abstract.
Boudreau Leo
Frommer William S.
Johnson Timothy M.
Sinderbrand Alvin
Sony Corporation
LandOfFree
Image signal processing apparatus utilizing a 2D Haar transform does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Image signal processing apparatus utilizing a 2D Haar transform , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image signal processing apparatus utilizing a 2D Haar transform will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1148129