Value correction method

Details Value correction method Value correction method

1987-03-17

1988-07-19

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

375 26, H04N 7133

Patent

active

047588896

ABSTRACT:
A method and circuitry for correcting discreet values transmitted in blocks. Circuitry performs at least one multiplication as of matrixes to obtain at least one product value having a plurality of digits, while limiting the number of digits. The correction value is then added to the product value. In the preferred embodiment, multiplication is of matrixes representing blocks of chromaticity or gray values by a transformation matrix and the multiplication produces matrixes in the frequency region. In this embodiment, only a single correction value is calculated, which is added to the mean value element of the matrix obtained by the multiplication and which corresponds to a multiple of the arithmetic mean of all of the elements of the image region matrix.

REFERENCES:
patent: 3927312 (1975-12-01), Dickinson
patent: 4524447 (1985-06-01), Willis
patent: 4594726 (1986-06-01), Willis
patent: 4694336 (1987-09-01), Keesen
B. G. Teubner Stuttgart, Arithmetic in Rechenanlagen, Logik und Entwurf, S. 62 u. 63, 77 bis 81 (1976).
Patent Abstract of Japan p. 344, Mar. 28, 1985, vol. 9, No. 68.
Patent Abstract of Japan p. 83, Oct. 8, 1981, vol. 5, No. 157.

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