Method and apparatus for the realization of two-dimensional disc

Details Method and apparatus for the realization of two-dimensional disc Method and apparatus for the realization of two-dimensional disc

1994-01-03

1996-07-23

Boudreau, Leo H.

Image analysis

Image compression or coding

Transform coding

358433, 364725, G06K 900

Patent

active

055398367

ABSTRACT:
A method and apparatus for the realization of two-dimensional discrete cosine transform (DCT) for an 8*8 image fragment with three levels of approximation of DCT coefficients. A first embodiment uses two multiplications for a pixel. A second embodiment does not use multiplications. The accuracy of approximation of DCT coefficients in the second embodiment is coordinated with distortion defined by a given quantization matrix. The Discrete Algebraic Transform (DAT) is presented. The DAT is a good approximation of the DCT and can be used in any combination with DCT.

REFERENCES:
patent: 4449194 (1984-05-01), Wilhelm
patent: 4831574 (1989-05-01), Duhamel
patent: 4837724 (1989-06-01), Borgers et al.
patent: 5029122 (1991-07-01), Uetani
patent: 5181183 (1993-01-01), Miyazaki

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