What is the principle of digital camera detection?

The working principle of CCD is that the light reflected by the photographed object propagates to the lens and is focused on the CCD chip through the lens. CCD accumulates corresponding charges according to the intensity of light, and generates electrical signals representing pictures after periodic discharge. After filtering and amplification, the standard composite video signal is output through the output end of the camera. This standard video signal is the same as the video output of home video recorder, VCD player and home video camera, so it can also be recorded or connected to TV to watch. A camera is a device that converts a light image of a scene into an electrical signal. From the perspective of energy conversion, the working principle of the camera is a light-electricity-magnetism-electricity-light conversion process. Therefore, the camera can shoot and image, mainly relying on the lens to form the image of the subject, and project it onto the imaging surface of the camera tube or solid-state camera device. The principle of depth of field plays an extremely important role in camera shooting. Correct understanding and application of depth of field is helpful to take satisfactory photos. Aperture, focal length and object distance are the main factors that determine the depth of field.

Zoom lens has the performance of continuously changing the focal length in a certain range under the condition that the imaging plane position is unchanged, and has become the most widely used lens in household cameras. The automatic acquisition device has four working modes, namely infrared mode, ultrasonic mode, Hainai Uai mode and Canon SST mode. They all have high measurement accuracy and are used in different types of cameras. The working principle of the camera: The camera is a device that converts the light image of a scene into an electrical signal. Its structure can be roughly divided into three parts: optical system (mainly lens), photoelectric conversion system (mainly camera tube or solid-state camera device) and circuit system (mainly video processing circuit). The main component of an optical system is an optical lens, which consists of a lens system. This lens system contains many lenses with different convexity and concavity, in which the middle of the convex lens is thicker than the edge, so the light passing through the edge of the lens will be refracted more than the light passing through the central part. When the object is refracted by the lens of the optical system, it forms a "focus" on the imaging surface of the camera tube or solid-state camera device of the photoelectric conversion system. The photosensitive element in the photoelectric conversion system will convert the optical image outside the "focus" into an electric signal with charge. These electrical signals are weak, and they must be further amplified by the circuit system to form signals that meet specific technical requirements and output from the camera.

The optical system is equivalent to the camera's eyes, which is closely related to the operation skills, and will be introduced in detail in the following chapters of this chapter. The photoelectric conversion system is the core of the camera, and the camera tube or solid-state camera device is the "heart" of the camera. The content of this part will be introduced in the third chapter. Since most household cameras combine the camera part and the video part into one, the working principle of the video part will be summarized below. When the camera system in the camera converts the optical image of an object into a corresponding electrical signal, a recording signal source is formed. The video recording system converts the electric signal sent by the signal source into a magnetic signal through the electromagnetic conversion system and records it on the video tape. If you need the camera's playback system to play back the recorded signal, you can manipulate the relevant buttons to turn the magnetic signal on the video tape into an electrical signal, which is amplified and sent to the TV screen for imaging.