Patent ID: 7479982

Claim:
A device for obtaining data for calibration of a camera capable of operating under varying optical conditions, using a plurality of images of a calibration chart comprising first marks and second marks, the first marks being more easily recognizable than the second marks, the images being photographed with said camera under varied optical conditions, comprising: a mark extracting part for extracting said second marks from said images photographed respectively under the varied optical conditions using at least three different photographing angles, the photographing angles being set using the first marks of said chart; an internal parameter calculating part for calculating data for calibration under optical conditions under which said images of said chart were photographed based on positions of said second marks extracted by said mark extracting part and a plurality of conditions under which said images of said chart were photographed; and an internal parameter function calculating part for calculating data for calibration corresponding to said varied optical conditions of said camera, using said data for calibration calculated in said internal parameter calculating part and a plurality of optical conditions under which said images of said chart were photographed.