Patent ID: 8248508

Claim:
A computer-implemented distortion correcting method, the computer comprising a processor, the method comprising: a preparation operation of respectively obtaining actual measured lens position information obtained by an optical system at a time of shooting an image via the processor, an error range in the lens position information, and a relational expression between a distortion pattern given by the optical system to the image and the lens position information; a correcting operation of estimating the distortion pattern of the image shot by the optical system by fitting actual measured data of the lens position information to the relational expression via the processor, and performing distortion correcting on the image at least once or more to obtain one or more temporary corrected images; a selection operation of selecting via the processor, based on at least one of the temporary corrected images obtained in the correcting operation, a distortion correcting pattern to be applied in main correcting performed on the image; and a repeating operation of repeating via the processor the correcting operation by adjusting a value of the actual measured data to be fit to the relational expression in the correcting operation within the error range when the distortion correcting pattern to be applied in the main correcting is not selected.