Digital signal processing circuit for digital camera

Details Digital signal processing circuit for digital camera Digital signal processing circuit for digital camera

1988-09-26

1990-03-27

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 55, 358 21R, 358 29V, 358160, H04N 973, H04N 907

Patent

active

049115529

ABSTRACT:
A digital detecting or charge-discharge control circuit is useful in a video camera as a peak detector in an automatic iris control circuit, as a reference voltage generator in an automatic white balance control circuit and/or as a low pass filter in an automatic black balance control circuit. The digital detecting circuit includes multipliers for multiplying by first and second coefficients which determine charging and discharging times, respectively, and the value of such first and second coefficients are controlled or varied in accordance with the selected operating mode of the camera so that broad ranges of iris, white balance and/or black balance control can be achieved.

REFERENCES:
patent: 4805010 (1989-02-01), Shroyer et al.
patent: 4814864 (1989-03-01), Pritchard

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