Method and apparatus for fast two-dimensional cosine transform f

Details Method and apparatus for fast two-dimensional cosine transform f Method and apparatus for fast two-dimensional cosine transform f

1995-05-15

1998-04-07

Bost, Dwayne

Image analysis

Image enhancement or restoration

Image filter

382263, 382264, 348403, 358433, G06K 940

Patent

active

057374503

ABSTRACT:
A method and apparatus for applying an image filter to an image signal where image data terms, corresponding to the image signal, are converted by means of an overlapping operation and a scaled forward orthogonal transformation to form frequency coefficient matrices, the image filter is converted by means of a descaled orthogonal transformation to form a descaled frequency filter matrix, and the frequency coefficient matrices are multiplied by the descaled frequency filter matrix to form filtered coefficient matrices for conversion into a filtered image signal by means of an inverse orthogonal transformation process.

REFERENCES:
patent: 5168375 (1992-12-01), Reisch et al.
patent: 5224062 (1993-06-01), McMillan, Jr. et al.
patent: 5299025 (1994-03-01), Shirasawa
patent: 5408425 (1995-04-01), Hou
patent: 5563718 (1996-10-01), Wober
Y. Arai et al., "A Fast DCT-SQ Scheme for Images," Trans. IEICE, vol. E-71, No. 11 (Nov. 1988), pp. 1095-1097.
W.B. Pennebaker et al., JPEG Still Image Data Compression Standard, Van Nostrand Reinhold (1993), pp. 344-345.
Y. Arai et al., A Fast DCT-SQ Scheme for Images, Trans. IEICE, vol. E-71, No. 11 (Nov. 1988), pp. 1095-1097.
B.D. Tseng et al., "On Computing the Discrete Cosine Transform," IEEE Trans. Comput., vol. C-27, No. 10 (Oct. 1978), pp. 966-968.
E. Feig, "A Fast Scaled-DCT Algorithm," SPIE, vol. 1244 Image Processing Algorithms and Techniques (1990).
B.G. Lee, "A New Algorithm for the Discrete Cosine Transform," IEEE Trans. Acoust., Speech and Signal Process., vol. ASSP-32 (Dec. 1984), pp. 1243-1245.

Affiliated with

Also associated with

Rating

Method and apparatus for fast two-dimensional cosine transform f does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for fast two-dimensional cosine transform f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for fast two-dimensional cosine transform f will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-21266