IMAGE PICKUP APPARATUS AND CAMERA SYSTEM CAPABLE OF IMPROVING CALCULATION ACCURACY OF DEFOCUS AMOUNT

摘要

An image pickup apparatus includes an image pickup element that includes imaging pixels and focus detection pixels and that performs a photoelectric conversion of an object image, a readout unit that reads a pair of image signals from the focus detection pixels with a predetermined period, a storage unit that stores the pair of image signals read by the readout unit and optical information of the pair of image signals, an addition unit that adds a plurality of signals of time-series continuous frames of the pair of image signals, and a conversion coefficient determination unit that determines a conversion coefficient that converts an image shift amount of a pair of image signals of an addition frame obtained by the addition unit into a defocus amount, and the conversion coefficient determination unit determines the conversion coefficient of the addition frame based on the time-series continuous optical information.