An image sensor with a dynamic range of 100 dB should be used. An image sensor with an optical format of 1/3 inch has been specified. Image sensors supply 3.6V voltage. It is, however, recommended that the minimum voltage supplied by image sensors be 3V. A temperature of 105°C is required for the operation of image sensors. The temperature of these electronic parts should be higher than -40°C. The maximum current that a sensor can carry is 60mA.