1. Camera: in the system, the camera is at the forefront of the system. It transforms the light image of the set object into an electrical signal -- video signal, providing a signal source for the system, so it is one of the most important equipment in the system.
2. The camera lens: the function of the camera optical lens is like observable light to focus on the pieces of the CCD sensor, the sensor of objects on the image will be like, although with a simple convex lens can achieve the above purpose, but the image quality is not high, not available in the center and edge of image, therefore often additional number of lens elements, composed of a compound lens, can get satisfactory image.