Image processing method, image processing apparatus and image pickup apparatus

摘要

The image processing method acquires an input image and information on an image capturing condition, acquires an optical transfer function corresponding to the image capturing condition, calculates a specific frequency at which an index value obtained by using the optical transfer function becomes a predetermined value in each azimuth direction, and produces a window function to divide a frequency band of the input image into lower and higher frequency side bands than the specific frequency in each azimuth direction. Then, the method produces, by using the window function and the optical transfer function, an image restoration filter to perform the image restoration process on the lower frequency side band of the input image and to restrict the image restoration process on the higher frequency side band thereof, and performs the image restoration process using the image restoration filter.

主权项

1. An image processing method for performing an image restoration process on an input image produced by an image pickup apparatus, the method comprising the steps of:
acquiring the input image and information on an image capturing condition at a time of producing the input image in the image pickup apparatus; acquiring an optical transfer function of the image pickup apparatus corresponding to the information on the image capturing condition; calculating a specific frequency at which an index value obtained by using the optical transfer function becomes a predetermined value in each of azimuth directions; producing a window function to divide a frequency band of the input image into a lower frequency side band and a higher frequency side band than the specific frequency calculated in each of the azimuth directions; producing, by using the window function and the optical transfer function, an image restoration filter to perform the image restoration process on the lower frequency side band of the input image and to restrict the image restoration process on the higher frequency side band thereof; and performing the image restoration process using the image restoration filter.