Image processing apparatus capable of movie recording, image pickup apparatus, control method therefor, and storage medium

Abstract

An image processing apparatus that correctly acquires evaluation values when movie recording is performed at a fixed frame rate. A first readout unit reduces readout rows of an image pickup device, and acquires and outputs image data for movie recording from the reduced readout rows. A second readout unit acquires image data from readout rows that do not overlap with that by the first readout unit at higher rate than the first readout unit, and outputs the acquired image data simultaneously with the first readout unit. Whether a subject's state changes for both the image data acquired by the first and second readout units is determined. If it is determined that the subject's state in the image data acquired by the second readout unit is changed, a speed at which the second readout unit acquires image data is changed while the first readout unit maintains a fixed speed.