What does camera CCD mean?

the CCD marked on the camera is an image sensor. The optical signal can be directly converted into an analog current signal, and the current signal can be amplified and converted to an analog-to-digital signal to realize image acquisition, storage, transmission, processing and reproduction.

the image sensor utilizes the photoelectric conversion function of photoelectric devices. Convert the light image on the photosensitive surface into an electrical signal with a corresponding proportional relationship with the light image. Compared with the photosensitive elements of "point" light sources such as photodiode and phototransistor, the image sensor is a functional device that divides the light image on the light receiving surface into many small units and converts it into usable electrical signals.

Extended information:

CCD is widely used in digital photography and astronomy, especially in optical telemetry, optical and spectral telescopes and high-speed photography, such as Lucky imaging. CCD is widely used in video cameras, digital cameras and scanners, except that the camera uses dot matrix CCD, that is, it includes X and Y directions for taking plane images, while the scanner uses linear CCD, which has only X direction, and the Y direction scanning is completed by the mechanical device of the scanner.

Reference: Baidu Encyclopedia --CCD.