Method for image compression implementing fast two-dimensional discrete cosine transform
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United States of America Patent
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Jun 24, 1997
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Mar 17, 1995
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Dec 20, 1991
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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.
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