Patent Number: 8,878,980

Title: Image signal processing device for auto-focus for a scene including a point light source

Abstract: The autofocus function included in general digital cameras and video cameras cannot set the camera to an in-focus state for a scene including a point light source depending on cases. This difficulty is removed by an image signal processing device including an area setting unit to set an area as a target area to calculate a focus evaluation value, a detection unit to judge presence or absence of a point light source in the area set as a target area, and a calculation unit to identify, by use of information obtained from the detection unit, an area in which a point light source exists and to calculate a focus evaluation value by removing the identified area from the target area. Once the detection unit detects a point light source, it conducts the operation only after a predetermined period of time.

Inventors: Ohbuchi; Mari (Yokohama, JP), Sai; Hirotomo (Yokohama, JP), Shiokawa; Junji (Chigasaki, JP)

Assignee: Hitachi, Ltd.

International Classification: H04N 5/232 (20060101)

Expiration Date: 2019-11-04 0:00:00