US Patent No: 5,677,733

Number of patents in Portfolio can not be more than 2000

Exposure control device having a plurality of light detecting areas

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An exposure control device having a light measuring area setting circuit which sets a light measuring area on an image sensing plane, a discriminating circuit which discriminates from each other varied states of the image sensing plane through video signal parts corresponding to the inside and the outside of the light measuring area and an exposure compensating circuit which compensates the state of exposure to light is arranged to shift the set position of the light measuring area to trace an object's image at least when the exposure compensating circuit is in operation. The operating modes of the device includes a first light measuring mode in which a quantity of light is measured on the basis of the average video signal level of the whole image sensing plane, a second light measuring mode in which the light quantity is measured with weight attached to a video signal part obtained from the inside of the light measuring area, and a third light measuring mode in which the light quantity is measured with weight attached to the video signal of the light measuring area by shifting the light measuring area to trace the object. The three light measuring modes are adaptively switched from one over to another.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
CANON KABUSHIKI KAISHATOKYO54565

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujiwara, Akihiro Tochigi-ken, JP 76 773
Homma, Hideo Tokyo, JP 24 462
Kaneda, Kitahiro Kanagawa, JP 95 844
Suda, Hirofumi Kanagawa, JP 77 878
Yamada, Kunihiko Tokyo, JP 39 634
Yoshimura, Katsuji Kanagawa-ken, JP 73 1296

Cited Art Landscape

Patent Info (Count) # Cites Year
 
CANON KABUSHIKI KAISHA (3)
4,550,995 Automatic focus adjusting device 15 1984
4,774,401 Light measuring device variably controlled according to focus mode selection 45 1986
5,272,538 Exposure control device 140 1990
 
Mamiya Koki Kabushiki Kaisha (1)
4,382,665 Automatic focusing device 19 1981
 
Minolta Camera Kabushiki Kaisha (1)
4,792,820 Camera with automatic focus and exposure control means 23 1986
 
MITSUBISHI DENKI KABUSHIKI KAISHA (1)
5,023,712 Tracking distance-measuring equipment system with means for setting a window and means for sampling image signals at predetermined time intervals 29 1990
 
SOCIEE DE FABRICATION D'INSTRUMENTS DE MESURE (S.F.I.M.) 13, AVENUE MAREL RAMOLFO GARNIER 91301 MASSY, FRANCE (1)
4,644,397 Method of processing a video image to track a bright spot and to protect said tracking from interference from other bright spots 7 1985
 
TEXAS INSTRUMENTS INCORPORATED (1)
4,868,871 Nonparametric imaging tracker 23 1987
 
Westinghouse Electric Corp. (1)
4,713,533 Concentric detector array and associated hybrid signal processing for coarse and fine electro-optical tracking 17 1986

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
BEHAVIORAL RECOGNITION SYSTEMS, INC. (5)
8,131,012 Behavioral recognition system 3 2008
8,064,695 Dark scene compensation in a background-foreground module of a video analysis system 2 2008
8,300,924 Tracker component for behavioral recognition system 0 2008
8,620,028 Behavioral recognition system 0 2012
8,705,861 Context processor for video analysis system 0 2012
 
CANON KABUSHIKI KAISHA (3)
6,480,226 Image pickup apparatus having gradation control function for providing image signals definitive of backlighted objects 31 1995
6,630,960 Image pickup device 31 1998
7,359,000 Image pickup apparatus, control method therefor, and computer-readable program for implementing the control method 0 2003
 
COGNEX CORPORATION (2)
6,531,707 Machine vision method for the inspection of a material for defects 13 2001
6,765,224 Machine vision method and system for the inspection of a material 8 2003
 
SONY CORPORATION (2)
6,323,898 Tracking apparatus and tracking method 25 1996
7,268,806 Exposure control device for camera mounted on electronic apparatus 2 2001
 
TRANSPACIFIC OPTICS LLC (2)
6,674,549 Apparatus for capturing image 0 1999
RE41069 Apparatus for capturing image 0 2006
 
BRICKSTREAM CORPORATION (1)
6,141,433 System and method for segmenting image regions from a scene likely to represent particular objects in the scene 50 1997
 
CASIO COMPUTER CO., LTD. (1)
7,825,955 Image pickup apparatus, exposure control method, and computer program installed in the image pickup apparatus 1 2005
 
Konica Corporation (1)
6,583,820 Controlling method and apparatus for an electronic camera 22 1998
 
SAMSUNG TECHWIN CO., LTD. (1)
5,963,254 Technique for backlight compensation by selecting most appropriate compensation area and controlling iris in accordance with luminance level thereof 8 1996
 
SIMMONDS PRECISION PRODUCTS, INC. (1)
7,280,696 Video detection/verification system 17 2002
 
XACTI CORPORATION (1)
6,636,262 Automatic focusing device 16 1999

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