Image-dependent color correction using black point and white poi

Details Image-dependent color correction using black point and white poi Image-dependent color correction using black point and white poi

1993-10-22

1994-12-06

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Color separation

358518, H04N 146

Patent

active

053716159

ABSTRACT:
A method for correcting color shifting produced by improper imaging, in a digital signal representation of a natural scene image including the steps of: determining the white point of an image; determining the black point in an image; calculating a color correction for the image as a function of the white point and the black point and applying the correction to each pixel in the digital signal representation of a natural scene image for printing.

REFERENCES:
patent: 2571697 (1951-10-01), Evans
patent: 4614967 (1986-09-01), Sayanagi
patent: 4864392 (1989-09-01), Sato
patent: 5315380 (1994-05-01), Ingraham et al.
A. Usami, "Signal Processing by the Input Interface to a Digital Color Laser Copier", SID 90 Digest, 1990 pp. 498-500.

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