Television – Camera – system and detail – Optics
Patent
1993-05-20
1997-12-30
Faile, Andrew
Television
Camera, system and detail
Optics
348221, H04N 5335
Patent
active
057036446
ABSTRACT:
An automatic exposure control apparatus includes an image frame luminance calculation unit for calculating an average luminance of an image frame; a region luminance calculation unit for calculating average luminances of a plurality of regions, the plurality of regions constituting the image frame; a select region luminance calculation unit for arranging the average luminances obtained by the region luminance calculation unit in the luminance order, for selecting at least one of the plurality of regions according to the luminance order and for calculating an average luminance selected from at least one of the plurality of regions; a backlight degree calculation unit for calculating a value representing a backlight degree based on the average luminance obtained by the select region luminance calculation unit; a target luminance calculation unit for calculating the target average luminance based on the value; and an exposure correction unit for correcting an exposure so that the average luminance obtained by the image frame luminance calculation unit is kept substantially equal to the target average luminance.
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Egusa Yo
Fujimoto Makoto
Goto Yukie
Mori Tsutomu
Christensen Andrew B.
Faile Andrew
Matsushita Electric - Industrial Co., Ltd.
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