Electronic still camera for compensating color temperature depen

Details Electronic still camera for compensating color temperature depen Electronic still camera for compensating color temperature depen

1987-09-08

1988-09-27

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 41, 358909, H04N 973

Patent

active

047745649

ABSTRACT:
The output level of color video signals, especially the G-signal or the luminance signal from a solid-state imaging device of an electronic still camera, is maintained constant regardless of the color temperature for optimum adjustment of the white balance. This is made possible in such a manner that the gain of a variable-gain amplifier for white balance adjustment is separately controlled for each of the three primary colors as a function of a measured color temperature, or that the light exposure realized by the diaphragm and the shutter is adjusted as a function of the color temperature. A control circuit for effecting the adjustment includes lookup table data for compensating for color-temperature-dependent sensitivity characteristics of the solid-state imaging device. The color temperature is measured by a color temperature sensor or a sensor sensing the color component of incident light. In such a manner, changes in sensitivity characteristics of the solid-state imaging device or the difference in sensitivity characteristics between the solid-state imaging device and the light measurement device as a function of the color temperature may be compensated.

REFERENCES:
patent: 4584598 (1986-04-01), Kutaragi
patent: 4595946 (1986-06-01), Uehara et al.
patent: 4646161 (1987-02-01), Tsuchiya et al.
patent: 4682210 (1987-07-01), Ikemura et al.
patent: 4682211 (1987-07-01), Kaji
patent: 4692794 (1987-09-01), Suzuki
patent: 4692815 (1987-09-01), Kawahara et al.
patent: 4727413 (1988-02-01), Mirura et al.

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