What We Should Know In Order To Make Qualitative Digital Video Recording?
Disputes about the transition to digital techniques have ended - by modern digital device it is possible to record absolutely everything qualitative - from the car up to a brilliant, from the press conference up the wedding celebration.
The digital image is a result of mathematical calculation in which as one of the key parameters the number of pixels defining the spatial sanction appears. To each pixel the certain value of a signal of brightness and signals of chromaticity is attributed at the set length - the number of bites. The higher is the sanction and the more gradation of colours and levels of brightness; the higher will be quality of the image also (and certainly, the greater will be also a volume of the digital information). At reception of images of high clearness, all video information in a camera is processed and deduced in the form of HD or HDV video signals, like the wy it occurs in a usual video camera.
If the cameras of PAL format, as a rule, write down a signal received with the use of usual four-channel HD-cameras enable a choice between interlaced and progressive format of recording. The choice of the record format renders an essential influence on the quality of the image. In interlaced mode, the camera usually works with the filter operating in a vertical direction due to which reduction of the sanction on a vertical can reach 30 percents.
However the filtration is necessary, otherwise it would be impossible at use of the equipment on electron beam tubes to get rid of importunate trembling lines of the image. At record in a progressive mode such problem does not arise, and the filter doesn't become necessary. In the same way, the progressive record provides the best sanction of moving images. That is why the images received by means of progressive record appear at the same number of lines much more precise, than those, which are interlaced.
All new systems of display, such as plasma and liquid crystal screens and projectors are progressive. At submission on them interlaced signal, it should be de-interlace first, which is very complex, demands additional processing and not always leads to success. On the other hand, progressive signals generating such displays directly, and clearing from interlaced becomes unnecessary. Thus, it is possible to expect that progressive formats in the near future become prevailing.
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