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WalVisions Test Patterns

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Animated Test Patterns - Descriptions

WV-11 Animated Color Bars

Here's a good demonstration of how areas of the eye can be desensitized by what has been viewed. Hold your head steady and stare at the center of the image (or any fixed place), and note that after the color bars disappear, they remain  in your eye, but reversed from normal!  For instance, where the green bar was now appears magenta, the complementary color.  By looking at green (or any color) for just a few seconds, that part of the eye becomes less sensitive to green (or that color).

WV-12 Animated 4x4 Checkerboard

With this animated pattern you can check how much dark image areas become "washed out" by other screen areas being illuminated.  This is a simple way to subjectively check "ANSI Contrast Ratio".  Try making a viewing tunnel by coiling your fingers, then look at only one of the dark squares - how much does the white squares lighting affect the dark square?  Do the dim grays and dim, saturated colors become "clouded"?

WV-13 Animated 2x2 Checkerboard

This is similar to the Animated 4x4 Checkerboard, but has larger dark and white areas.  When viewing in a full screen mode, the lower left portion of the screen should be all black.  Check the washout in this area when the white areas are illuminated. Try to determine how much of the washout in that area comes directly from the projector, and how much is reflected back from the room furniture, floor, walls and ceiling.

WV-14 DLP Rainbow Finder

Follow the "Look Here" prompt as accurately as you can. What happens to the center white column? Single chip DLP projectors only project one color at any one instant, but the eye nicely combines the rapid cycling of the red-green-blue projected images so it appears as though all colors are continuously present. But if the eye moves rapidly, the red, green and blue images form on different parts of the eye - and "rainbows" are seen.
  The center column can also show separation/distortion on any display that isn't always present, such as CRTs displays.  

WV-15 Expanding Ring

As this ring expands, you will likely notice the rings linger in your eye as you eye is desensitized where the rings have been imaged.  With single chip DLP projectors the rainbow effect may be apparent if you try to follow the rings.  With "slow" LCD projectors you may see the rings linger a bit.  You may see some color differences in the rings if the colors (red, green, blue) turn ON/OFF at different speeds.  Note that the rings may breakup due to imperfections in graphics processing.

WV-16 Growing Fields

This pattern is primarily for evaluating CRT projectors.  Unlike "bulb" projectors where the light for all screen areas is always present, the CRT projector starts with no light and makes light as it is needed.  This takes power, and the projector may show some effects of the high demand for power as more white area is illuminated.  Check for image size changes, bending of the vertical lines and dimming as a greater percentage of the image becomes  illuminated.
WV-17 Dynamic Brightness

This pattern can be used in the evaluation of display performance as the image undergoes overall scene brightness changes.  The gray bars in the lower left are the unchanging reference, and ideally will stay constant as the brightness in the rest of the image changes.  Digital projectors with dynamic lamp or iris features that react to overall scene brightness changes may show some effects, and plasmas and CRT projectors will likely show dimming with the brighter frames due to power (beam current) limiting.

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