DISTANCE MEASUREMENT DEVICE AND DISTANCE MEASUREMENT METHOD

摘要

A distance measurement device (10) is provided with an imaging element (14) that includes photoelectric conversion elements disposed in rows and columns and that images an object by performing exposure and charge reading sequentially by row or column, an optical system (11) that is for forming an image of the object on the imaging element (14) and has a focus position that can be controlled, an imaging control unit (12A) that controls the optical system (11) so as to move the focus position at a constant velocity and acquires a plurality of blurred images by causing the imaging element to sequentially image the object in the middle of the movement of the focus position at the constant velocity, a distance measurement unit (16) that uses a point spread function corresponding to the object distance and the plurality of blurred images to measure the distance from a reference position in the optical system (11) to the object, and a correction unit (17A) for performing distance correction for each row or column before or after distance measurement on the basis of the movement ranges of the focus position during the exposure periods for each row or column when the plurality of blurred images were acquired.