Image input system, conversion matrix calculating method,...

Details Image input system, conversion matrix calculating method,... Image input system, conversion matrix calculating method,...

2004-10-14

2008-11-25

Safaipour, Houshang (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S509000, C358S515000, C358S518000

Reexamination Certificate

active

07457000

ABSTRACT:
The present invention provides a technique capable of promptly and easily acquiring object color component data of a plurality of subjects even if the spectral distribution of light illuminating said plurality of subjects is not known in advance. For example, under predetermined conditions of irradiating a subject with predetermined illumination light by using an electronic flash, an image input system captures an image of a first subject to thereby acquire first color image data. On the basis of the acquired first color image data, the image input system estimates first object color component data of the first subject. After that, the image input system captures an image of the first subject in unknown illumination environments to thereby acquire second color image data. By using the first object color component data and the second color image data, the image input system estimates the spectral distribution of unknown illumination. Subsequently, on the basis of the estimated spectral distribution of unknown illumination, the image input system calculates a conversion matrix for converting color image data of the subject acquired in the unknown illumination environments into object color component data.

REFERENCES:
patent: 7158144 (2007-01-01), Shiraiwa et al.
patent: 2005/0012948 (2005-01-01), Gotoh et al.
patent: 2001-078202 (A) (2001-03-01), None
patent: 2003-169339 (A) (2003-06-01), None

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