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Repeating and
Full Field Test
Patterns - Descriptions
Repeating Test Patterns
For best use of these repeating patterns (WV-51 to WV-57), a "pixel
by pixel" display is necessary.
For fixed resolution
(digital) displays, this means setting the graphics display
output to exactly match the projector/display resolution, and
setting the display scaling to "native" or "true" or "resizing
OFF". While this isn't important for many of the patterns
at WalVisions, for the Repeating Patterns this "pixel by
pixel" display mapping is necessary to achieve the maximum
pattern benefit.
WV-51 Complex Test Pattern
This repeating pattern can be used for many checks, including geometry, color registration, overscan, gray scale, brightness and contrast control setting, pixel clock and phase setting, resolution, bandwidth, focus and aliasing. This is possibly the one single pattern that is the most revealing about a display's characteristics.
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WV-52 Convergence Test Pattern
This pattern is a critical test of color registration and individual color focus over all parts of the screen. The positions of the red, green and blue images can be directly compared to each of the other colors, both horizontally and vertically. The focus of each color is also apparent in all parts of the screen.
Look carefully at plasma and LCD panels, and you will see that the red, green
and blue vertical line are offset from each other in the horizontal direction!
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WV-53 Alternating Pixel Test Pattern
This pattern consists of pixels that alternate ON-OFF going across the screen. In
some row sections the pixels are arranged in columns, and in row sections they are staggered. For displays that exactly match the source resolution, pixels should be perfectly clear. If not, the Clock and Phase adjustments may be necessary.
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WV-54 256 Level Horizontal Gray Ramp
Each block of this repeating pattern consists of all gray levels from 0 to 255, which corresponds to 24 bit color (8 bits each for red, green, blue). Each small bar marks the four pixel wide column for each particular level. The pattern should display as a smoothly increasing brightness ramp without any coloration.
How many times this is repeated will depending upon your display resolution -
you can compare the performance in different screen areas by looking at the
pattern in the different areas.
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WV-55 256 Level Vertical Gray Ramp
Each block of this repeating pattern consists of all gray levels from 0 to 255, which corresponds to 24 bit color (8 bits each for red, green, blue). Each small bar marks the six pixel tall row for each particular level. The pattern should display as a smoothly increasing brightness ramp without any coloration.
How many times this is repeated will depending upon your display resolution -
you can compare the performance in different screen areas by looking at the
pattern in the different areas. |
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WV-56 64 Lowest Level Vertical Gray Steps
Each block of this repeating pattern consists of all gray levels from 0 to 63, which corresponds to the lowest 64 of 256 levels in 24 bit color (8 bits each for red, green, blue). These low steps should be color-free, but you should be able to make out the differences in levels, particularly for the lowest steps.
How many times this is repeated will depending upon your display resolution -
you can compare the performance in different screen areas by looking at the
pattern in the different areas. |
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WV-57 90% Step Diff Vertical Gray Steps
Each block of this repeating pattern is 90% of its brighter neighbor. The peak level is full white, and the minimum level is about 1/500th of peak white, assuming a properly setup display with a gamma of 2.5. The apparent brightness difference for each of these steps should be approximately the same, and all should appear gray (color-free).
How many times this is repeated will depending upon your display resolution -
you can compare the performance in different screen areas by looking at the
pattern in the different areas. |
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WV-58
Resolution Targets
Each block of this repeating pattern is
a resolution target consisting of a series of alternating ON/OFF lines of
pixels. The finest lines are one pixel wide, the medium lines and two
pixels wide, and the widest lines are four pixels wide. This pattern can
be used to check resolution over all screen areas. |
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WV-59 Complex2 Pattern
Each block of this repeating pattern is
a composite test target consisting of a mini color bar pattern, a mini gray
scale pattern, a resolution-focus-registration pattern, gray block, and the
WalVisions name-logo. This pattern can
be used to check for uniformity and consistency of all these patterns over all screen areas.
Note that each individual test block is 160 x 160 pixels. |
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WV-60 Complex3 Pattern
An enhanced version of WV-59, each block of this repeating pattern is a
composite test target also includes 1 and 2 alternating pixel vertical and
horizontal lines, and tick marks that are spaced at every 10 pixels, and
the test block is 200 x 200 pixels. Like WV-59 this pattern can be used to
check for uniformity and consistency of all these patterns over all screen
areas, as well to check for true pixel to pixel mapping and possible scaling
artifacts. |
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