The difference between digital million HD and traditional analog camera technology

[ Huaqiang Security Network News ] HD cameras are the goal of many photographers, and the digital million HD cameras have won many people's favorite. What is the essential difference between it and the traditional analog camera? Let's compare it technically!
In terms of performance, the digital million HD camera can be said to be comprehensive beyond the traditional analog camera. Due to the essential difference of its working principle, the analog camera technology has developed various bottlenecks and limitations, and the digital million HD The outstanding features of the product overcome these limitations. The biggest difference between a million HD cameras and analog cameras is the leap in picture quality.
Analog camera
First of all, the original analog camera original resolution is not high, coupled with repeated A / D conversion, electromagnetic transmission interference, interlaced scanning, D1 picture synthesis de-interlacing and other video damage, the actual arrival of the human eye is very blurred It is unclear, so whether it is D1 or 4CIF, it is only a theoretical value. In practical applications, the resolution is completely below the theoretical level. The digital camera adopts digital signal transmission, which converts the optical signal into digital signal, then the image is compressed and processed by the DSP, and finally the digital compressed video is output through the network. The digital camera is anti-electromagnetic interference, progressive scan, and image resolution. The rate has the advantage that traditional analog cameras can't match.
Secondly, the traditional analog color camera captures the vertical resolution, 625 lines in the PAL system, 575 lines after blanking, up to 540 lines is the current limit, and the digital HD camera can reach the minimum of 800 lines, and the resolution from From the above point of view, the highest resolution of traditional analog cameras can reach D1 or 4CIF, which is about (400,000 pixels), while digital cameras do not have this limitation, and can reach megapixels or even tens of millions of pixels. The performance of pixels and clarity is simply not the same.
Third, the image scanning mode adopted by the digital million HD camera is progressive scanning, and each frame image is continuously scanned by the electron beam sequentially one by one and one row. The scanning mode of the conventional analog camera uses interlaced scanning, and the line scanning frequency of the interlaced scanning is half of that of the progressive scanning. Interlaced scanning has many disadvantages in its application due to its working principle, such as the occurrence of inter-row flickering effects, parallel phenomena or vertical edge aliasing, and the overall motion picture clarity is reduced.
Fourth, the color of the digital high-definition camera can be more realistic than the analog camera. The luminance signal and the chrominance signal in the analog video signal occupy the same frequency band, and when comb-filtering (bright color separation) is performed by the video capture chip, It is difficult to completely separate the chromaticity and brightness signals, resulting in faint spots and color penetration on the screen, while the digital HD camera does not have this trouble, the color is more realistic, more layered, and the picture saturation is better.
Fifth, analog cameras need to have control lines, video lines, audio lines, and power lines all wired in an independent form. The wiring is very complicated and complicated, and the workload is large, and the overall wiring cost is high. There are many in engineering applications. Limitations.


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