Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-11-24
1988-09-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
350354, H01J 314
Patent
active
047727853
ABSTRACT:
Apparatus is provided which greatly reduces the intensity of bright portions of an image while only moderately reducing the brightness of dimmer portions of the image, to thereby compress the range of light intensities to facilitate detection of the image. The apparatus includes a light detector device formed by a chip of photorefractive material. A two-dimensional array of light beams from an object to be detected, passes through a beam splitter to form two arrays of light beams. The two arrays of light beams are directed at different angles against a surface of the chip of photorefractive material, the two arrays of light beams forming coincident images on the surface. One of the two-dimensional arrays of beams emerging from an opposite surface of the chip has a lower range of intensities, to facilitate detection of the object despite very bright spots on its image. The other array of light beams energing from the chip has a greater range of intensities than the unprocessed image of the object.
REFERENCES:
patent: 4508431 (1985-04-01), Henshaw
patent: 4585301 (1986-04-01), Bialkowski
patent: 4720176 (1988-01-01), Klein et al.
Cheng Li-Jen
Liu Hua-Kuang
Cooper Crystal
Jones Thomas H.
Manning John R.
McCaul Paul F.
Nelms David C.
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