Showing papers on "Digital camera published in 1988"

Digital signal processing circuit for digital camera

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.