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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Oct 14, 1997
Issued date -
Feb 1, 1994
filing date -
08/190,226
serial no -
In Force
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Abstract
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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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 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 | 138 | 1990 | |
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| 4,382,665 Automatic focusing device | 18 | 1981 | |
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| 4,792,820 Camera with automatic focus and exposure control means | 23 | 1986 | |
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| 5,023,712 Tracking distance-measuring equipment system with means for setting a window and means for sampling image signals at predetermined time intervals | 28 | 1990 | |
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| 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 | |
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| 4,868,871 Nonparametric imaging tracker | 22 | 1987 | |
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| 4,713,533 Concentric detector array and associated hybrid signal processing for coarse and fine electro-optical tracking | 17 | 1986 | |