Automatic cross color elimination

Details Automatic cross color elimination Automatic cross color elimination

1996-01-11

1997-09-30

Boudreau, Leo

Image analysis

Color image processing

Color correction

382191, G06K 900

Patent

active

056733364

ABSTRACT:
Color crosstalk is determined between layers of an image storage medium based on the cross correlations and autocorrelations of noise in the grain pattern in each layer of the image storage medium. Rather than relying on prior measurement under laboratory conditions, the invention scans the storage medium in a plurality of spectral bands to derive the record stored in each of the dye layers. A computer derives the autocorrelations and the crosscorrelations of a group of pixels between the plurality of color records of the scanned images each of which corresponds to one of the spectral bands. The invention is based on the observation that as each dye layer is deposited separately in the film, one would expect that the "noise" from the grain boundaries in one layer to be independent from the "noise" due to the grain boundaries in other layers. If there is correlation in noise between separate color scans, it is because the scanner is measuring the grain boundaries in more than one layer in the color scans.

REFERENCES:
patent: 4974068 (1990-11-01), Hiramatsu et al.
patent: 5509086 (1996-04-01), Edgar et al.

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