Photon Focus MV2-D1280-640, User Manual, Page: 35 / 85

Figure 4.18: Proper grey reference image for gain correction
4.4.4 Corrected Image
Offset and gain correction can be switched on seperately. The following configurations are
possible:
• No correction
• Offset correction only
• Offset and gain correction
In addition, the black reference image and grey reference image that are currently stored in
the camera RAM can be output.
5
7
6
5 7
6
6
5 6
4 3 7
3
4
7
1
7 4 6 4
4
3
1
3
4
c u r r e n t i m a g e
)
5
6
6
5 5
6
5
5 4
4 3 7
3
4
7
1
7 4 6 4
4
3
1
3
4
)
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 4.19: Corrected image
Table 4.1 shows the maximum values of the correction matrices, i.e. the error range that the
offset and gain algorithm can correct.
minimum maximum
Offset correction -63 DN @ 8 bit +63 DN @ 8 bit
Gain correction 0.42 2.67
Table 4.1: Offset and gain correction ranges
.
4.4 Image Correction 33