IMAGE PICKUP APPARATUS CAPABLE OF DETERMINING LIGHT AMOUNT CHANGE CHARACTERISTIC, METHOD OF DETERMINING LIGHT AMOUNT CHANGE CHARACTERISTIC, AND STORAGE MEDIUM

摘要

An image pickup apparatus capable of determining a light amount change characteristic at the time of photographing with high accuracy. A light amount change period of light from a photometric target is determined, based first and second evaluation values calculated, respectively, based on a predetermined photometric value, and each of photometric values at first and second intervals causing the photometric values to be in the same phase relationship and the opposite phase relationship with the predetermined photometric value, respectively, in a case where the light from the photometric target changes at a predetermined frequency. It is determined whether or not the light from the photometric target changes at a light amount change period corresponding to the predetermined frequency.

主权项

1. An image pickup apparatus comprising:
a photometry unit; a first calculation unit configured to calculate a first evaluation value, based on a predetermined photometric value and a photometric value at a first interval from the predetermined photometric value, out of a plurality of photometric values acquired by periodically performing photometry at fixed time intervals using said photometry unit; a second calculation unit configured to calculate a second evaluation value, based on the predetermined photometric value and a photometric value at a second interval from the predetermined photometric value, out of the plurality of photometric values; and a determination unit configured to determine a light amount change period of light from a photometric target, based on the first evaluation value and the second evaluation value; wherein said determination unit determines whether or not the light from the photometric target changes at a light amount change period corresponding to a first frequency, wherein the first interval is an interval which causes the photometric value at the first interval to be in the same phase relationship with the predetermined photometric value in a case where the light from the photometric target changes at the first frequency, and wherein the second interval is an interval which causes the photometric value at the second interval to be in an opposite phase relationship with the predetermined photometric value in a case where the light from the photometric target changes at the first frequency.