Patent ID: 8355058

Claim:
An image pickup apparatus comprising: an image pickup unit configured to photoelectrically convert an optical image of an object, the optical image having passed through an optical member, to thereby output the optical image as image data; an acquisition unit configured to acquire a status of the optical member; a first calculation unit configured to calculate a first correction value for correcting image quality degradation due to characteristics of the optical member, based on characteristic information on the optical member and the status of the optical member acquired by said acquisition unit; a second calculation unit configured to set a rate of change at which a second correction value is made closer to the first correction value, and to repeatedly calculate the second correction value according to the first correction value and the rate of change; and a correction unit configured to correct the image data based on the second correction value calculated by said second calculation unit, wherein said second calculation unit is configured to set the rate of change in dependence upon a relationship between a preceding value of the second correction value calculated in the past and the first correction value.