Method for determining color of an illuminant in an image based

Details Method for determining color of an illuminant in an image based Method for determining color of an illuminant in an image based

1993-08-31

1996-02-27

Ramirez, Ellis B.

Boots, shoes, and leggings

358522, 358518, 382167, 382171, 382274, 364514R, G06K 938

Patent

active

054954282

ABSTRACT:
An electronic method measures the color cast of a digital representation of a natural scene. Colors of the natural scene are represented in digital electronic form as pixels. Neighborhoods of pixel colors in a chrominance histogram are isolated. Neighborhoods may be isolated by convolving the chrominance histogram with a two-dimensional filter. Lighting color from the scene is measured from isolated color neighborhoods by: a) determining lines in a chrominance plane which lie along major axis of isolated color neighborhoods, and b) selecting a convergence-chrominance value near which the detected lines converge. Lines in the chrominance plane may be weighted so that lines from neighborhoods that are more reliable indicators of lighting contribute more to the convergence-chrominance than less lines from less reliable neighborhoods. The image is then transformed so as to map the measured lighting value to another value, such as neutral.

REFERENCES:
patent: 4648051 (1987-03-01), Wandell et al.
patent: 4661907 (1987-04-01), Arnone et al.
patent: 4685071 (1987-08-01), Lee
patent: 4719503 (1988-01-01), Craver et al.
patent: 4779142 (1988-10-01), Freeman et al.
patent: 4812904 (1989-03-01), Maring et al.
patent: 4977448 (1990-12-01), Murata et al.
patent: 4989080 (1991-01-01), Ito
patent: 4992963 (1991-02-01), Funt et al.
patent: 5045933 (1991-09-01), Tatsumi
patent: 5060060 (1991-10-01), Udagawa et al.
patent: 5089976 (1992-02-01), Cate et al.
patent: 5105466 (1992-04-01), Tsujiuchi et al.
patent: 5130789 (1992-07-01), Dobbs et al.
patent: 5278641 (1994-01-01), Sekizawa et al.

Affiliated with

Also associated with

Rating

Method for determining color of an illuminant in an image based 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 for determining color of an illuminant in an image based , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for determining color of an illuminant in an image based will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1683840