The difference between analog video and digital video video signals can be divided into two categories: analog video signals and digital video signals. Analog video means that each frame of image is the real image signal of natural scenery obtained in real time.
Video signals can be divided into analog video signals and digital video signals.
Analog video means that each frame of image is the real image signal of natural scenery obtained in real time. The TV and movies we see in our daily life belong to the category of analog video. Analog video signals have the advantages of low cost and good reproducibility, and video images often give people an immersive feeling. However, its biggest disadvantage is that no matter how good the recorded image signal is, the signal and picture quality will be greatly reduced after long-term storage; Or after repeated copying, the picture distortion will be obvious.
Digital video signal is video information based on digital technology and other extended image display standards. Compared with analog video, digital video has the following characteristics:
(1) Digital video can be copied countless times without distortion, while the analog video signal will have an error accumulation every time it is transcribed, resulting in signal distortion.
(2) The quality of analog video will decrease after long-term storage, while digital video is convenient for long-term storage.
(3) The digital video can be non-linearly edited and special effects can be added.
(4) The amount of digital video data is large, so it must be compressed and encoded in the process of storage and transmission.
With the continuous development of the application range of digital video, its role is becoming more and more obvious.