Photon Focus MV3-D640I-M01-144-CL, User Manual, Page: 60 / 121

9 Pixel Data Processing
2400 2600 2800 3000 3200 3400 3600 3800 4000 4200
0
0.2
0.4
0.6
0.8
1
Histogram of the uncorrected grey reference image
Grey level, 12 Bit [DN]
Relative number of pixels [−]
grey reference image ok
grey reference image too bright
Figure 9.5: Proper grey reference image for gain correction
Defect pixel correction
If the hot pixel correction is switched on, the camera replaces the value of a defect pixel by an
average of its neighbour pixels (see Fig. 9.6).
The hot pixel correction also corrects cold (black) defect pixels if a grey reference
image has been set prior to the
Calculate
step.
h o t
p i x e l
p
n
p
n - 1
p
n + 1
p
n
=
p
n - 1
+ p
n + 1
2
Figure 9.6: Defect pixel interpolation by the hot pixel correction
9.2.5 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.
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