METHOD AND CIRCUIT FOR ELECTRONIC SHUTTER CONTROL

An improved method and apparatus for controlling the shutter open time in an opto-electronic device is presented. A frame of pixel intensity data is collected and the average pixel intensity value is across said frame is calculated and compared to a first threshold. If the average pixel intensity is outside a first intensity range defined by said first threshold, the shutter open time is adjusted in a first direction. Otherwise, the peak pixel intensity value across the frame is found and compared to a second threshold. If the peak pixel intensity value is outside a second intensity range defined by said second threshold, the shutter open time is adjusted in said first direction. If the peak pixel intensity value is not outside a second intensity range, the peak pixel intensity value is compared to a third threshold. If the peak pixel intensity value is outside a third intensity range defined by the third threshold, the shutter open time is adjusted in a second direction.