Limitation of Traditional Photoreceptive Hardware Design
Photo-resistor and photo-diode are two kinds of electronic components that have been widely used in cameras to detect the illumination of the surveillance scene so that the IR cut can be properly shifted to provide light compensation in low-light situations. They are sensitive to light and temperature to control the current of the circuit. When they detected brightness decreases to a threshold value, the IR lamp will be turned on to give light compensation. However, there are loads of disadvantages, which brings unavoidable troubles for customers.