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Description of the data path
Figure 56: Shading correction: Source image with non-uniform illumination
How to store shading image
There are two storing possibilities:
•
After generating the shading image in the camera, it can be uploaded to
the host computer for nonvolatile storage purposes.
•
The shading image can be stored in the camera itself.
The following pictures describe the process of automatic generation of cor-
rection data (PIKE F-032C). Surface plots and histograms were created using
the ImageJ program.
255.0
surface plot
0.0
histogram
0
•
On the left you see the source image with non-uniform illumination.
•
The surface plot on the right clearly shows a gradient of the brightness
(0: brightest
255: darkest pixels).
•
The histogram shows a wide band of gray values.
By defocusing the lens, high-frequency image data is removed from the
source image, therefore its not included in the shading image.
Count: 307200
Min: 79
Mean: 135.337
Max. 19
StdDev. 30.497
Mode: 88 (4200)
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PIKE Technical Manual V4.1.0
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