The different formats of the video determine the performance of the signal in terms of brightness, chromaticity, contrast, sharpness, sharpness, and maximum resolution. From the analysis of the video formats we use in engineering, we can know that the level of video high-definition quality can be roughly sorted like this: DVI-ïƒ RGBHV/VGA-ïƒ DHTV-ïƒ SDI-ïƒ Y, Pb,Pr/Y, RY, BY-ïƒ Y/C S-Video-ïƒ Video-ïƒ RF.
Among them, the highest level of DVI digital video signals are currently selected, but there are shortcomings of short-distance transmission (effective distance is about 5 meters), SDI digital video has the advantage of being editable and longer-distance transmission, RGBHV and VGA are actually the same grade. The signal is only because of the different components of the signal. There are two kinds of names. S-Video has a significant improvement in brightness utilization compared to Video (short for composite video), and effectively eliminates the phenomenon of color creep. The RF format is the lowest. Level signals are only applied in the range of surveillance and public television.
Engineering applications often face many conversion processes for signal formats. Which of these different formats of signal conversion need to follow? What effect will it ultimately have?
Generally considered:
The low-level format has a significant quality improvement to the high-level format conversion, such as the early multi-frequency scanner or quadruple-frequency scanner, and the current popular intelligent video regulator, which is Video-RGBHV (composite video-component video) The conversion process has a significant improvement in improving the quality of the signal. Because these products use multi-bit digital technology, signal quality (sharpness, brightness, signal-to-noise ratio) can be highly restored.
DVI digital video is usually converted to SDI or RGBHV, the original signal has a loss of clarity after conversion, but the DVI signal is transmitted over long distances; the actual effect of VGA signal conversion to RGBHV is not improved, because the two are equivalent. However, the problem of synchronous universal matching of the VGA signal is solved, and transmission over a longer distance is possible.
The process of converting high-level formats to low-level formats (such as VGA to Video) can cause serious damage to any aspect of the original signal, including brightness, chrominance, color, contrast, sharpness, sharpness, and maximum resolution. This conversion does not make any sense, but it has a certain value in the early days, such as: converting the computer's VGA signal into Video for tape recording, TV TV wall display, or for "grabbing" transmission in video conferencing.
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