Patent ID: 8451349
Filing Date: 2013-05-28
Classification: H04N

Abstract:
1. A video signal correcting device of an electronic camera comprising: a storage unit which stores therein white spot addresses, and an optical black level median obtained from a video signal at a time of dark shooting, and a sensitivity and a time-in-second at the time of dark shooting, as well as a temperature coefficient for correcting an output level of the video signal at each of the white spot addresses in accordance with a temperature at a time of shooting by the electronic camera, a sensitivity coefficient for correcting the output level of the video signal at each of the white spot addresses in accordance with the sensitivity at the time of shooting by the electronic camera, and a time-in-second coefficient for correcting the output level of the video signal at each of the white spot addresses in accordance with an exposure time-in-second at the time of shooting by the electronic camera; a temperature detection unit which obtains a temperature difference at a time of shooting a subject according to a difference between the optical black level median at the time of shooting a subject and the optical black level median at the time of dark shooting stored in said storage unit; and an operation unit which obtains a correction value for the output level of the video signal at each of the white spot addresses due to a temperature according to the temperature difference and the temperature coefficient stored in said storage unit, obtains a correction value for the output level of the video signal at each of the white spot addresses due to a sensitivity according to a difference between the sensitivity at the time of shooting a subject and the sensitivity at the time of dark shooting stored in said storage unit and to the sensitivity coefficient stored in said storage unit, obtains a correction value for the output level of the video signal at each of the white spot addresses due to a time-in-second according to a difference between the time-in-second at the time of shooting a subject and the time-in-second at the time of dark shooting stored in said storage unit and to the time-in-second coefficient stored in said storage unit, performs correction on the output level of the video signal at each of the white spot addresses included in the video signal at the time of shooting a subject according to each correction value for the output level of the video signal at each of the white spot addresses due to the temperature, the sensitivity, and the time-in-second, and subtracts the optical black level median at the time of shooting a subject from the video signal at the time of shooting a subject.