Image sensing device having expanded dynamic range

Details Image sensing device having expanded dynamic range Image sensing device having expanded dynamic range

1994-06-29

1996-05-14

Groody, James J.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348 28, 348229, H04N 5235

Patent

active

055172423

ABSTRACT:
An image sensing device is provided with an expanded dynamic range when it photographs a moving object. A first gray value D1 of first picture taken with first exposure time is read in the first time interval and a second gray value D2 of second picture taken with second exposure time is read in the second time interval. Two function values f(D2) and g(D2) are calculated with respect to the second gray value D2. Then, a weight coefficient with respect to the function f(D2) is multiplied by the first gray value D1 and a weight coefficient with respect to the function g(D2) is multiplied by the second gray value D2. Those multiplied gray values are summed up. Such calculation of multiplying and summing up is carried out in each picture element of the first picture and the second picture, respectively.

REFERENCES:
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patent: 5144442 (1992-09-01), Ginosaur et al.
patent: 5162914 (1992-11-01), Takahashi et al.
patent: 5309243 (1994-05-01), Tsai
Rangaraj M. Rangayyan, et al., Expanding the Dynamic Range of X-Ray Videodensitometry Using Ordinary Image Digitizing Devices, Sep. 15, 1984, vol. 23, No. 18, Applied Optics, pp. 3117-3120.

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