Patent ID: 7936357

Claim:
A method of generating a correction value of an image generating device by a correction unit, the image generating device displaying an image which has a non-uniformity, the correction unit correcting an inputted image signal of the image by using a correction value corresponding to the non-uniformity, and then the correction unit outputting the corrected image signal to the image generating device, the method comprising: detecting the non-uniformity of the image displayed on the screen; setting nodes on the basis of the detected non-uniformity; dividing the image into a plurality of element regions by connecting the set nodes to one another; and setting a correction value for each of the divided plurality of element regions, each node being a single XY coordinate, the setting of the nodes including: setting a distance between equipotential lines on the basis of the non-uniformity, each of the equipotential lines being obtained by joining pixels having approximately same output characteristic values to one another; setting a plurality of equipotential lines on the basis of the set distance between equipotential lines; setting a plurality of nodes on each of the set equipotential lines; and dividing the image displayed on the screen into a plurality of element regions on the basis of the set nodes, each equipotential line having substantially the same output characteristic values, wherein the setting of the distance between equipotential lines includes: acquiring a portion, in which an output characteristic value farthest from an output characteristic value to be originally displayed is detected, on the basis of the non-uniformity, and setting the distance between equipotential lines in the vicinity of the acquired detection portion to be narrower than those in other portions.