DVDO AVLab TPG Podręcznik Użytkownika Pobierz pdf (Strona 24)

DVDO AVLab TPG - 4K Test Pattern Generator

DVDO AVLab TPG 24 A.04

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 AVLab, 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 AVLab – 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.

PLUGE patterns (2 white and 2 black)

These patterns are used to visually adjust brightness (black level) and contrast (white level) as well as to

verify the display is in the correct color space mode.

RGB video is normally sent using all 256 bits (in 8 bit color)

but YCbCr (component video) sets black at 16 and white at

238. This allows room above and below the active video for

below black and above white. PLUGE patterns are

specifically designed to allow quick visual setting of the

black and white level.

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DVDO AVLab TPG Podręcznik Użytkownika Strona 24