| 主权项 |
1. A focus detection apparatus comprising:
a plurality of filters respectively suitable for processing of signals having different frequencies for obtaining a focus state evaluation value in a sub-scanning direction of an image sensor that has a plurality of pixels arranged two-dimensionally; a setting unit configured to set a thinning rate in a main-scanning direction of the image sensor depending on a filter to be used, of the plurality of filters; a control unit configured to perform control such that image signals are sequentially read with the thinning rate set by the setting unit from a detection area, on which focus control processing is performed, of areas of the plurality of pixels and are stored in a storage unit; a processing unit configured to process, each time image signals of the number of lines required for the processing by the filter to be used are stored in the storage unit, the stored image signals with the filter to be used and obtain a focus state evaluation value; and a focus control unit configured to perform the focus control processing based on the focus state evaluation value obtained by the processing unit, wherein, if the filter to be used is suitable for processing of a signal having a second frequency that is higher than a first frequency, the setting unit sets a thinning rate that is lower than that in the case where the filter is suitable for processing of a signal having the first frequency. |
