The frame interpolation circuit 61 interpolates an interpolated image for interpolating the non-photographing section between the exposure section to be exposed and the next exposure section based on the captured images of both exposure sections temporally adjacent to the non-photographing section. To generate. Then, the frame composition circuit 62 generates a composite image for the predetermined time interval based on the captured image captured in the predetermined time interval and the interpolation image generated by the frame interpolation circuit 61 for the time interval.
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