Photon Focus MV4 Series, User Manual

Page: 73 / 143

12.2 Image Correction
12.2.5 Corrected Image
Offset, gain and hot pixel correction can be switched on separately. The following
configurations are possible:
• No correction
• Offset correction only
• Offset and hot pixel correction
• Hot pixel correction only
• Offset and gain correction
• Offset, gain and hot pixel correction
In addition, the black reference image and grey reference image that are currently stored in
the camera RAM can be output.
5
7
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5 7
6 6
5 6
4 3 7
3
4
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1
7 4 6 4
4
3
1
3
4
c
u r r e n t i m a g e
)
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5 5
6 5
5 4
4 3 7
3
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1
7 4 6 4
4
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)
1
1
1
2 - 1
2 - 2
- 1 0
1 - 1 1
- 1
0
2
0
- 1
0
- 2
0
1 1 - 2 - 2 - 2
o f f s e t c o r r e c t i o n
m a t r i x
-
1
1 . 2
1
0 . 9 1
1 . 2 - 2
0 . 9 1
1 - 1 1
0 . 8
1
1
0
1 . 3
0 . 8
1
0
1 1 - 2 - 2 - 2
g a i n c o r r e c t i o n
m a t r i x
=
.
c o r r e c t e d i m a g e
)
Figure 12.5: Schematic presentation of the corrected image using gain correction algorithm
12.2.6 Correction Ranges
Table 12.1 shows the minimum and maximum values of the correction matrices, i.e. the range
that the offset and gain algorithm can correct.
Minimum Maximum
Offset correction -1023 DN @ 12 bit +1023 DN @ 12 bit
Gain correction 0.75 1.75
Table 12.1: Offset and gain correction ranges
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