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NIST FPD Lab Test Patterns for Laboratory Testing

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Title: NIST FPD Lab Test Patterns for Laboratory Testing Subject: Setup Author: Edward F. Kelley Description: For setting up the display for measurements. – PowerPoint PPT presentation

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Title: NIST FPD Lab Test Patterns for Laboratory Testing


1
National Institute of Standards and
Technology Flat Panel Display Laboratory Version
1.0, April 16, 2001
TEST PATTERNS NISTSU01.
These patterns are provided for the setting up
and examining an electronic display. If the
display has adjustments and the manufacturer
doesnt specify how to set the display up, adjust
the display settings (contrast, brightness,
etc.) to obtain the most acceptable performance
according to how the display is intended to be
used. The settings established with this method
should not be changed during the course of other
measurements serving to characterize the display,
unless the display is used in a manner that
optimizes the display performance for each
measurement performed.
For more information contact Edward F. Kelley,
301-975-3842, kelley_at_nist.gov.
RENDERING GRAY LEVELS AT A LOWER GRAY-SCALE
RESOLUTION Bits in software are associated with
discrete levels of electrical signals to produce
various shades of gray on the screen. These bit
levels are called gray levels or command levels.
The relationship between the gray level (bits in
software) and the gray shade is the gray scale or
the electro-optical transfer functionsometimes
called the gamma because of the historical
usage of the term. The number of gray shades
actually produced will not necessarily be the
same as the number of gray levels depending upon
the characteristics of the display used. Given n
gray levels that can be employed to present gray
shades on a screen, there are w  n - 1 gray
levels above zero with gray-level 0 for black and
gray-level w  n - 1 for white. We want to select
a subset of m levels (m lt n) that are relatively
evenly spaced within this larger set of n levels.
The interval between the w levels to create m
levels is DV  w/(m-1), which may not be an
integer. The m levels we select are the (integer)
values given by Vi  int(i-1)DV for
i  1, 2, ..., m or Vi  0, int(DV), int(2DV),
int(3DV), ..., int(m-1)DV, with
int(m-1)DV  w for white. For example, in an
8-bit gray scale, there are n  256  28 levels
with the white level as w  255. Suppose we want
to select m  8 gray levels that are evenly
spaced. The needed interval is DV  36.4286, and
the chosen levels are 0, 36, 73, 109, 146, 182,
219, 255. If we wanted to select m  32 levels
from the 256 levels, wed use DV  8.2258 to give
levels 0, 8, 16, 25, 33, 41, 49, 58, 66, 74, 82,
90, 99, 107, 115, 123, 132, 140, 148, 156, 165,
173, 181, 189, 197, 206, 214, 222, 230, 239, 247,
255.
DISCLAIMER These patterns and test images are
prototypes for our electronic-display standards
development activities in standards committees
and working groups. They are not to be
distributed as approved NIST test patterns nor
are they standard reference material. They are
supplied without any guarantee of their accuracy,
suitability, or completeness. It is anticipated
that modifications will be made to this set in
the future. These are supplied for your
scientific experimentation only. We would value
any suggestions or comments. The use of any
commercial products in connection with the
development of these test patterns does not
constitute an endorsement by NIST.
2
Large circle diameters are 5 of diagonal.
Small circle diameters are 3 of diagonal.
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32 Gray Levels
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TEXT SAMPLES
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
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The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
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The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps. 0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
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TEXT SAMPLES
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps. 0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
The quick brown fox jumps over the lazy dog.
0123456789
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50 Gray (127/255)
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Dark Gray (66/255)
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7 (255/255)
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6 (219/255)
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5 (182/255)
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4 (146/255)
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3 (109/255)
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2 (73/255)
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1 (36/255)
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0 (0/255)
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Large circle diameters are 5 of diagonal.
Small circle diameters are 3 of diagonal.
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0, 5, 10, 15 (0, 13, 25, 38) 85, 90,
95, 100 (216, 229, 242, 255)
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0, 5, 10, 15 (0, 13, 25, 38) 85, 90,
95, 100 (216, 229, 242, 255)
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0, 5, 10, 15 (0, 13, 25, 38) 85, 90,
95, 100 (216, 229, 242, 255)
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2x2
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2x2
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2x2
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2x2
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3x3
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3x3
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3x3
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3x3
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4x4
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4x4
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4x4
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4x4
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5x5
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5x5
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5x5
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5x5
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6x6
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7x7
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7x7
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8x8
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12x12
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16
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24
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32
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64
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128
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256
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32 Gray Levels
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Large circle diameters are 5 of diagonal.
Small circle diameters are 3 of diagonal.
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