Method of designing opening pattern, image restoration method and image restoration apparatus

摘要

PROBLEM TO BE SOLVED: To allow image restoration to be preferably performed even when capturing an image by light having a narrow wavelength band.SOLUTION: An imaging portion of a positioning device that functions as an image restoration device is provided with an aperture diaphragm having an aperture pattern. In designing the aperture pattern, a plurality of candidate patterns are prepared. A PSF (Point Spread Function) of each candidate pattern is determined as a multi-gradation image by calculation (a step S22). A wavelength band of light is narrow, and an airy pattern appears in the PSF. Using the PSF, an evaluation value of each candidate pattern is determined (a step S23). The evaluation value indicates precision in restoration of a blurred image using the PSF. Based on the evaluation value, one of the plurality of candidate patterns is selected (a step S30). By utilizing the multi-gradation PSF, even when capturing an image by light having a narrow wavelength band, an aperture pattern that achieves preferable image restoration can be designed.