Browse Prior Art Database

MULTIPLE MATRIX REGRESSION METHOD FOR SCANNER COLOR REGRESSION

IP.com Disclosure Number: IPCOM000027759D
Original Publication Date: 1999-Jun-30
Included in the Prior Art Database: 2004-Apr-09
Document File: 2 page(s) / 49K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is the use of a multiple 3x3 matrix regression method that considers a scanner's response to be piecewise linear. Color corrections are required as long as scanners are not colorimetric. By dividing the color input space (RGB) into two regions and using a 3x3 matrix to fit data in each region, the resulting color error is much less than that obtained by using a single 3x3 matrix. This two-matrix method improves data fitting at all luminance levels, especially at higher ones where the human visual system is more sensitive to see a difference.

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XEROX DISCLOSURE JOURNAL

MULTIPLE 3x3 MATRIX REGRESSION METHOD FOR SCANNER COLOR REGRESSION Int. C1. G03g 15/01 Hong Li

Proposed Classification
U. S. C1. 399/039

Disclosed is the use of a multiple 3x3 matrix regression method that considers a scanner's response to be piecewise linear.

Color corrections are required as long as scanners are not colorimetric. By dividing the color input space (RGB) into two regions and using a 3x3 matrix to fit data in each region, the resulting color error is much less than that obtained by using a single 3x3 matrix. This two-matrix method improves data fitting at all luminance levels, especially at higher ones where the human visual system is more sensitive to see a difference.

G channel information is used to separate the color space into two regions. The first matrix corrects colors with a G response above a predetermined threshold while the second matrix corrects the rest. In order to avoid artifacts at the transition plane between the two matrices, a low G threshold is chosen by reason of the human visual system being less sensitive at lower luminance levels.

DP5849

XEROX DISCLOSURE JOURNAL - Vol. 24, No. 3 May/June 1999 135

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136 XEROX DISCLOSURE JOURNAL - Vol. 24, No. 3 May/June 1999

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