Smartek UCC User Manual page 121

The third example, illustrated in Figure 91, shows the inverting of an 8 bit monochrome image by
a LUT. Every input gray level value is transformed into an output gray-level value by the formula
8
.
Value = 2 − Value
out in
255
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195
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90
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45
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15
0
0
The last example demonstrates two implementations of contrast enhancement, using a look-up table applied
to an 8-bit per channel color image. In Figure 92 the first 45 pixel values have been set to 0 and pixel values
in range from 173 to 255 have been set to 255.
255
240
225
210
195
180
165
150
135
120
105
90
75
60
45
30
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0
0
15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255
index
Figure 91: Inverting a monochrome image using look-up table
15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255
index
Figure 92: Enhancing contrast of an image using look-up table
index value
0 255
1 254
2 253
... ...
126 129
127 128
128 127
... ...
253 2
254 1
255 0
index value
0 0
1 0
2 0
... ...
126 162
127 164
128 166
... ...
253 255
254 255
255 255
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User Manual - twentynine
Input Image
Output Image
Input Image
Output Image
SMARTEK Vision | User Manual - twentynine | Doc. v1.0.2