Method of correcting the measured reflectance of an image acquir

Details Method of correcting the measured reflectance of an image acquir Method of correcting the measured reflectance of an image acquir

1996-10-02

1998-08-04

Coles, Edward L.

Facsimile and static presentation processing

Natural color facsimile

Measuring, testing, and calibrating

358509, 358516, 358518, H04N 146

Patent

active

057902810

ABSTRACT:
This invention discloses a method of correcting the measurement of the amount of light reflected by a document that is being processed by a digital image acquisition apparatus. A typical image acquisition apparatus measures the amount of light reflected from the surface of the original document and sets a corresponding set of electrical signals to a printing or storage module. Image acquisition usually requires illuminating the original document with a reflecting cavity, which causes the measurement of the amount of light present on the surface of the document to become distorted. The method disclosed by the present invention corrects this phenomenon by calculating the amount of light that reaches the surface of the original document by being reflected from the illumination system and the surrounding cavity. This allows the measured reflectance to be corrected, and the true reflectance to be used for subsequent output or storage.

REFERENCES:
patent: 4717254 (1988-01-01), Masuda
patent: 5079678 (1992-01-01), Parker
patent: 5095372 (1992-03-01), Silverberg
patent: 5103385 (1992-04-01), Federico et al.
patent: 5123740 (1992-06-01), Giebeler, Jr.
patent: 5386267 (1995-01-01), Jones
patent: 5422703 (1995-06-01), Horie et al.
patent: 5453849 (1995-09-01), Copenhaver et al.
patent: 5519513 (1996-05-01), Copenhaver et al.
J.E. Farrell et al., "Sources of Scanner Calibration Errors", IS&T's Eighth International Congress on Advances in Non-Impact Printing Technologies, 1992, pp. 491-495.
Joyce E. Farrel & Brian A. Wandell, "Scanner Linearity", Journal of Electronic Imaging, Jul. 1993, vol. 2(3), pp. 225-230.

Affiliated with

Also associated with

Rating

Method of correcting the measured reflectance of an image acquir does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of correcting the measured reflectance of an image acquir, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of correcting the measured reflectance of an image acquir will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1183843