Bibliographic data: US5638119 (A) ― 1997-06-10


Device for increasing the dynamic range of a camera  

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Page bookmark US5638119 (A)  -  Device for increasing the dynamic range of a camera
Inventor(s): CORNUEJOLS GEORGES [FR] +
Applicant(s): SCANERA S C [FR] +
Classification:
- international: H04N5/235; H04N5/238; H04N5/335; (IPC1-7): H04N5/235
- cooperative:
Application number: US19920920302 19920817 
Priority number(s): FR19900002151 19900216 ; FR19900004756 19900405 ; WO1991FR00127 19910218
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Abstract of  US5638119 (A)


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PCT No. PCT/FR91/00127 Sec. 371 Date Aug. 17, 1992 Sec. 102(e) Date Aug. 17, 1992 PCT Filed Feb. 18, 1991 PCT Pub. No. WO91/12690 PCT Pub. Date Aug. 22, 1991A device for increasing the dynamic range of a camera comprising a lens (2) which forms a picture (6) of a scene (1) on a primary electronic image sensor (3) having a first dynamic range, a second image data source (4) corresponding to one picture of said scene (1), and an electronic image processing circuit (5), which combines the data from the primary image sensor (3) and the data from the second image data source (4) and provides image data representing the scene (1) as observed and represented by said image data, with a ratio between the brightest and dimmest areas of said scene (1) which is greater than the dynamic range of a primary image sensor (3). In various embodiments, the second image data source (4) is either a secondary image sensor or a memory which stores a previously sensed image from the primary image sensor (3). Said device preferably comprises a device (10) for controlling the sensitivity of the primary image sensor (3), and a transmissive, passive flat matrix screen (11) optically placed before the primary image sensor (3) to dim the brightest light rays passing therethrough.