The image/video sensor, which is the most important part of the webcam, is shown in the image above. The sensor used here is a CMOS Image sensor. The purpose of the image sensor is to convert the optical light signals into electrical signals. A CMOS sensor is made up of an array of photo detector with amplifiers, noise- correction and digitization circuit. It uses the CMOS technology for its manufacturing. The output of the CMOS sensor is digitalized signals.