Patent ID: 8446495

Claim:
An image pickup apparatus comprising: a detection unit including a plurality of pixels arranged in a matrix of rows and columns, each pixel including a conversion element configured to convert radiation or light into an electric charge, a first switch element configured to output an electric signal corresponding to the electric charge, and a second switch element that is electrically connected to the conversion element and that is configured to output a correction electric signal; a correction unit configured to perform a correction process based on the electric signal output via the first switch element of a particular pixel and the correction electric signal output via the second switch element of the particular pixel; and a control unit configured to control an operation of the detection unit such that a correction image signal based on the correction electric signal output via the second switch element is acquired in a period that partially overlaps in time a period in which an image signal based on the electric signal output via the first switch element is acquired, and such that, when the electric signal associated with the image signal is output for the particular pixel, the second switch element of the particular pixel is controlled to be in an on-state over a period during which the first switch element of the particular pixel is in an off-state.