The interlaced scanning photoreceptor at the front end of the analog camera will convert the optical signal into an analog electrical signal, and the DSP is responsible for A/D conversion and color processing and then performs D/A conversion, and finally outputs the video signal in PAL/NTSC format; the front end of the digital camera is used. The mega-pixel CMOS sensor converts the optical signal into a digital signal, while the DSP is responsible for image processing and compression, and finally output as a compressed video.
In terms of scanning mode: the analog camera adopts interlaced scanning, and its line scanning frequency is half of that of progressive scanning. Progressive scanning, each frame of image is continuously scanned by the electron beam line by line in sequence.
In terms of video transmission: because the analog camera outputs an analog signal, the signal is easily attenuated during long-distance transmission, and is susceptible to electromagnetic interference, which ultimately affects the image quality; the digital camera outputs a digital signal, which will not be affected by the long transmission distance. Electromagnetic interference and signal attenuation ensure the image quality after video transmission.