Techno;ogy

Guide To Virtual Reality Studio

The display or screen resolution used in a Virtual Reality Studio is the number of dots or pixels that can display graphics on a screen. The definition is the product of the number of points along the horizontal by the number of points in the vertical display.

To use a particular definition, it is necessary that the graphics card is capable of generating the video signal and the screen is able to display. The screen size and the drilling step (pitch) define the maximum resolution that can be achieved without loss of quality with respect to the image. It is also possible to use two monitors with one CPU: it allows for example to have a number of pixels in width that are twice as large, using a definition of 2048 × 768 points.

For a digital camera, a printer or scanner, the definition indicates the number of points that can be scanned or printed.

Definitions in the frequency sweep

The vertical resolution depends on the horizontal frequency of the monitor in kHz, which is the product of the frame rate by the vertical resolution. This is typically 50 Hz PAL or SECAM, 60 Hz NTSC and VGA monitors of basic 1 or LCD panels. They have more than 85 Hz high frame screens to limit the effects of flicker.

Generally, the vertical resolution is only achieved by its theoretical maximum value because some lines are often suppressed (as black) screens on analog connection (although the screen is a TFT LCD or slab). This allows the electron beam to move vertically during the retrace to the next frame on CRTs that are ideal for Virtual Reality Studio.

Similarly, the pixel frequency (in MHz) gives a maximum horizontal resolution. Likewise, the horizontal resolution obtained is the theoretical maximum as a number of pixels that can be displayed during the flyback.

On TV screens, scanning the screen is often interlaced. Two successive frames moving on one line, each following a second line is necessary to scan the entire screen. This technique reduces flickering and takes advantage of the high persistence CRT TV. Image retention is equivalent to a frame memory.

New TV screens offer a double scan (100 Hz in PAL or SECAM or NTSC 120 Hz using a full frame memory. It does not increase the resolution but reduces the spaced flicker and transforms the two half frames of an interlaced signal. This is done in non-interlaced complete frames covering the entire screen (not half lines) to the normal frequency of 50 Hz or 60 Hz.

However, it is not enough to increase frequencies to obtain a better resolution. The screen comprises a mask effect to determine the number of reproducing the phosphor pixels.

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