1, charge-coupled device (CCD) to receive the image transmitted by the optical lens, the analog-to-digital converter into a digital signal stored in the memory. The optical lens of the digital camera is the same as the traditional camera, the image will be aggregated to the light-sensitive device, that is, the (light) charge-coupled device (CCD).CCD replaces the position of the traditional camera in the light-sensitive film, its function is to convert light signals into electrical signals, the same as the TV camera.CCD is a semiconductor device is the core of the digital camera, the number of units of the device containing the decision of the digital camera imaging.
2, the camera is a use of optical imaging principles to form an image and the use of film to record the image of the device, is used for photography optical instruments. In modern society, there are many devices that can record images, they all have the characteristics of the camera, such as medical imaging equipment, astronomical observation equipment.
3, the photographed scene reflected light through the camera lens (camera lens) and control the exposure of the shutter focus, the photographed scene in the dark box on the formation of photographic material latent image, after processing (i.e., developing, fixing) constitute a permanent image, this technology is called photography, divided into general photography and professional camera.