DVDO iScan Guide de l'utilisateur télécharger pdf (Page 29)

DVDO iScan Mini - 4K Scaler / Video Enhancement

DVDO iScan Mini 29

be the native resolution of your display or your display may scale all input signals even if the input

resolution is already at native resolution.

Note: If this test pattern does not appear as it should and you have chosen the native resolution of your

display, you may not be able to bypass the internal processing on your display.

The ‘Vertical Lines’ test pattern should appear as one pixel wide black and white columns. If you see any

irregular pattern(s) in the image then you know that the display is scaling the signal horizontally.

If using a projector, the vertical lines will show distortion if any keystone is used. Keystone should be

avoided at all costs – instead, hang the projector in the correct position.

The ‘Horizontal Lines’ test pattern should appear as one pixel tall black and white rows. If you see any

irregular pattern(s) in the image then you know that the display is scaling the signal vertically.

Judder (Frame Rate)

The Frame Rate Conversion test pattern consists of a vertical bar which moves slowly back and forth

across the screen. The bar’s motion is updated once in each output frame period of the IScan Mini, and it

moves a fixed number of pixels horizontally in each frame period. This moving bar test pattern is intended

to identify the frame rates at which a display will operate. If the display is not performing any frame rate

conversion, i.e., it is actually displaying the output frame rate of the IScan Mini – the motion will be very

smooth. However, if the display is performing any type of frame rate conversion there will be very

noticeable stutter introduced in the smooth motion. There may also be other objectionable artifacts

introduced depending on how the display actually performs the conversion. These include tearing (top and

bottom portion of the bar are horizontally misaligned) and distortion.

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DVDO iScan Guide de l'utilisateur Page 29