Signal processor

A point setting part sets a position on a time axis of a main image signal corresponding to a capture instruction, as a registration point. A playback control part causes a buffer memory to output an image frame from the registration point used as a starting point in response to a given playback instruction. A capture processing part generates a registration image based on at least one image frame of the main image signal and stores the registration image, the at least one image frame being placed in a neighborhood of the registration point. A point recording part writes the registration point as a recorded point into a memory and writes the registration image as a recorded image corresponding to the recorded point into the memory. A point calling part reads out the recorded image and the recorded point from the memory in response to a given calling instruction. The point setting part sets the recorded point and the recorded image as the registration point and the registration image, respectively.