Method of coding two-dimensional data by fast cosine transform a

Details Method of coding two-dimensional data by fast cosine transform a Method of coding two-dimensional data by fast cosine transform a

1992-06-25

1994-03-29

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

358432, 358433, 364725, 364726, H04N 146

Patent

active

052990257

ABSTRACT:
A method of encoding two-dimensional original image data through fast cosine transformation FCT, the method including steps of inputting each block of N.times.N picture elements from the image data and transforming the block into N.times.N values of the first FCT coefficients by a first N.times.1 FCT circuit. The first N.times.1 FCT circuit uses multiplication factors of prescribed butterfly operations, the factors being multiplied by .sqroot.2. The method further includes storing the first FCT coefficients in a memory and transforming the first FCT coefficients into N.times.N values of second FCT coefficients by a second N.times.1 FCT circuit, the second N.times.1 FCT circuit using multiplication factors of prescribed butterfly operations, the factors being multiplied by .sqroot.2. The method further includes quantizing each of the second FCT coefficients using one of N.times.N corresponding values from a quantization table, the corresponding values being multiplied by 2. Finally, an entropy encoding of the quantized second FCT coefficients is performed, so as to produce compressed image data.

REFERENCES:
patent: 4679163 (1987-07-01), Arnould
patent: 4791598 (1988-12-01), Liou et al.
patent: 5164980 (1992-11-01), Bush

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