How does a digital video camera work?

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The working principle of digital video camera:

Simply put, it is the conversion and transmission of photoelectric digital signal, that is, the optical signal is converted into current through photosensitive elements, and then the analog electrical signal is converted into digital signal, and the information obtained after special chip processing and filtering is restored to the dynamic picture we see.

The photosensitive element of digital camera can convert light into charge, and the charge is converted into digital signal through analog-to-digital conversion chip. There are two main types: one is the widely used CCD (Charge Coupled Device); The other is CMOS (complementary metal oxide conductor) device.

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The high-definition analog camera records analog signals, so the image clarity (also called resolution, resolution or resolution) is not high. For example, the horizontal resolution of VHS camera is mainly 240 lines. It is better to mention that the Hi8 model has only 400 lines. DV records digital signals with a horizontal resolution of 500 to 540 lines, which is comparable to that of professional cameras.

The bandwidth of chroma and brightness signals of DV is almost six times that of analog cameras, and the bandwidth of chroma and brightness is one of the most important factors to determine the image quality, so the color of images taken by DV is more pure and gorgeous, reaching the level of professional cameras.