Arrangement for the expansion of the dynamic range of optical de

Details Arrangement for the expansion of the dynamic range of optical de Arrangement for the expansion of the dynamic range of optical de

1983-10-06

1986-05-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250578, G01J 132

Patent

active

045903670

ABSTRACT:
Light intensity levels are measured at various locations in a scene and light amplified and/or attenuated by a device interposed between the source of light and the light-sensitive surface having a limited dynamic range. By attenuating bright regions and/or amplifying weak regions, the dynamic range of light intensities of the scene is reduced, thus enabling the limited dynamic range device to be used with scenes having a larger light intensity dynamic range. In applying the method to the receiving side of a 3-D measurement system employing projected light, a simpler system results and problems associated with modifying the high energy projected light are avoided. Also, a greater range of measured object surface reflectance is accommodated.

REFERENCES:
patent: 4183672 (1980-01-01), Raber et al.
patent: 4314761 (1982-02-01), Reymond et al.
patent: 4441096 (1984-04-01), Evanchuk
patent: 4494874 (1985-01-01), Di Matteo et al.

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