Exposure control device having a plurality of light detecting areas

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5677733
SERIAL NO

08190226

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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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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
CANON KABUSHIKI KAISHATOKYO44371

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujiwara, Akihiro Kanagawa-ken, JP 71 993
Homma, Hideo Tokyo, JP 22 592
Kaneda, Kitahiro Kanagawa-ken, JP 69 1204
Suda, Hirofumi Kanagawa-ken, JP 61 1255
Yamada, Kunihiko Tokyo, JP 38 767
Yoshimura, Katsuji Kanagawa-ken, JP 73 1701

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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Mamiya Koki Kabushiki Kaisha (1)
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Minolta Camera Kabushiki Kaisha (1)
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MITSUBISHI DENKI KABUSHIKI KAISHA (1)
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CANON KABUSHIKI KAISHA (3)
* 4550995 Automatic focus adjusting device 15 1984
* 4774401 Light measuring device variably controlled according to focus mode selection 45 1986
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* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
AMETEK, INC. (2)
* 6531707 Machine vision method for the inspection of a material for defects 13 2001
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SAMSUNG TECHWIN CO., LTD. (1)
* 5963254 Technique for backlight compensation by selecting most appropriate compensation area and controlling iris in accordance with luminance level thereof 9 1996
 
FLIR COMMERCIAL SYSTEMS, INC. (1)
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SIMMONDS PRECISION PRODUCTS, INC. (2)
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EASTMAN KODAK COMPANY (1)
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SONY CORPORATION (3)
* 6323898 Tracking apparatus and tracking method 30 1996
* 7268806 Exposure control device for camera mounted on electronic apparatus 2 2001
* 2002/0021,901 Exposure control device for camera mounted on electronic apparatus 1 2001
 
AVIGILON PATENT HOLDING 1 CORPORATION (7)
8131012 Behavioral recognition system 17 2008
* 8064695 Dark scene compensation in a background-foreground module of a video analysis system 2 2008
* 2009/0087,093 DARK SCENE COMPENSATION IN A BACKGROUND-FOREGROUND MODULE OF A VIDEO ANALYSIS SYSTEM 9 2008
8300924 Tracker component for behavioral recognition system 2 2008
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XACTI CORPORATION (1)
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TRANSPACIFIC OPTICS LLC (2)
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Konica Corporation (1)
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CASIO COMPUTER CO., LTD. (2)
7825955 Image pickup apparatus, exposure control method, and computer program installed in the image pickup apparatus 3 2005
* 2006/0044,459 Image pickup apparatus, exposure control method, and computer program installed in the image pickup apparatus 14 2005
 
CANON KABUSHIKI KAISHA (4)
* 6480226 Image pickup apparatus having gradation control function for providing image signals definitive of backlighted objects 33 1995
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* 7359000 Image pickup apparatus, control method therefor, and computer-readable program for implementing the control method 0 2003
* 2004/0151,488 Image pickup apparatus, control method therefor, and computer-readable program for implementing the control method 1 2003
* Cited By Examiner