Title:
DEVICE AND METHOD FOR ESTIMATING LIGHT SOURCE, IMAGE PICKUP DEVICE, AND IMAGE PROCESSING METHOD
Document Type and Number:
Japanese Patent JP3767541
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a device and method for estimating a light source by which the chromatic characteristic of an unknown light source of a photographed scene can be estimated from a sensor response, an image pickup device, and an image processing method for improving the color reproduction quality of white balance adjustment etc.
SOLUTION: In the method for estimating a light source, a projection converting section 6 using a parameter obtained from the spectral sensitivity characteristic of an already known image pickup means 4 and the spectral characteristic of a supposed test light source 1 through colorimetrically approximation-possible calculation estimates the correct photographing light source 2 with respect to a sensor response value 5, by projecting a scene upon an image distribution 9 in an evaluation space not relying upon the light source 2, and evaluating rightfulnesses of a plurality of test light sources 1 based on the distributed state of sample value of the projected scene by means of an evaluating section 10.
Inventors:
Koichiro Ishigami
Naoya Kato
Naoya Kato
Application Number:
JP2002328719A
Publication Date:
April 19, 2006
Filing Date:
November 12, 2002
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H04N9/04; H04N9/64; H04N1/46; H04N1/60; H04N9/73; H04N101/00; (IPC1-7): H04N9/64; H04N1/46; H04N1/60; H04N9/04; //H04N101:00
Domestic Patent References:
| JP2001186540A | ||||
| JP2001311666A | ||||
| JP5111059A | ||||
| JP11025252A |
Attorney, Agent or Firm:
Yoshitsuno Kakuda
Hironobu Isoyama
Hironobu Isoyama
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