19.2 Improving the acquisition / image quality 145
19.2.1.1.2 Correcting cold pixels
To correct the cold pixels following steps are necessary:
1. You will need a uniform sensor illumination approx. 50 - 70 % saturation (which means an average gray value
between 128 and 180)
2. Set the (Filter-) "Mode = Calibrate cold pixel" (Figure 2)
3. Snap an image ("Acquire" with "Acquisition Mode = SingleFrame")
4. To activate the correction, choose one of the neighbor replace methods: "Replace 3x1 average" or
"Replace 3x3 median"
5. Save the settings including the correction data via "Action -> Capture Settings -> Save
Active Device Settings"
(Settings can be saved in the Windows registry or in a file)
Note
After having re-started the camera you have to reload the capture settings vice versa.
The filter checks:
Pixel < T[cold] // (default value: 15 %)
// T[cold] = deviation of the average gray value (ColdPixelDeviation_pc)
All pixels below this value have a dynamic below normal behavior.
MATRIX VISION GmbH
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