Patent ID: 7684615

Claim:
A signal correcting method performed by a control device that includes a processor, the method comprising: obtaining, by the control device, image data containing color-related signals in correspondence to individual pixels; and substituting, by the control device, a signal value of the color-related signal at a target pixel with an average value calculated by using the signal value of the color-related signal at the target pixel and a signal value of the color-related signal at each of nearby pixels when the color-related signal at the target pixel and the color-related signal at each of the nearby pixels are judged to be symmetrical to each other relative to a specific color, wherein: a coordinate system is expressed by color components constituting the color-related signal, and when the color-related signal at the target pixel and the color-related signal at each of the nearby pixels are symmetrical to each other relative to the specific color, a point determined by the color components at the target pixel and a point determined by the color components at each of the nearby pixels are substantially present on a straight line having a predetermined slope in the coordinate system.