Oliff & Berridge, PLC
Electronic camera video signal correcting device
A device stores in ROM white spot addresses, white spot levels, an OB level median, sensitivity, and time-in-second under dark shooting, a temperature coefficient correcting the white spot level according to the temperature under normal shooting, a sensitivity coefficient for the sensitivity-based correction, and a time-in-second coefficient for the exposure time-in-second-based correction. A temperature difference during shooting a subject is obtained according to the difference between OB level median during normal shooting and that during dark shooting. A correction value for the white spot level due to temperature is obtained from temperature difference and temperature coefficient, and similarly, correction value due to sensitivity is obtained from sensitivity difference and sensitivity coefficient, and correction value due to time-in-second is obtained from time-in-second difference and time-in-second coefficient for correction. Dark current is corrected by subtracting OB level median during shooting a subject from the video signal during shooting a subject.
Nikon Corporation
H H
H04N H04N
inventional inventional
Yoshizo
Mori