Intelligent exposure control for electronic cameras

Details Intelligent exposure control for electronic cameras Intelligent exposure control for electronic cameras

1986-10-10

1988-04-19

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358221, 358228, 35821319, H04N 5235, H04N 5238

Patent

active

047394099

ABSTRACT:
In an electronic still camera adapted for professional or amateur photography, a solid state thermo-electric cooler rapidly cools a solid state image sensor (imager) in accordance with the ambient illumination or subject brightness, so as to rapidly increase the sensitivity of the imager to the required level. Thus, the device may be used in place of a flash attachment for still photography under low-light conditions. A microprocessor controls the cooler and determines optimum imager temperature for a given set of subject brightness, shutter speed and aperture size values. These values are correlated to corresponding optimum imager temperatures by a set of polynomials--or by a set of look-up tables--stored in a read only memory accessed by the microprocessor.

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