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Description of the data path
OSCAR Technical Manual V2.4.0
76
The following pictures illustrate the sequence of commands for generating
the shading image.
The correction sequence controlled (e.g. via Directcontrol) uses the average
of 16 frames (10H) to calculate the correction frame.
The top picture shows the input image (with lens out of focus). The bottom
picture shows the shading corrected output image (unfocused lens).
Note
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Configuration
To configure this feature in an advanced register: See Table
90: Advanced register: Shading on page 188.
Note
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The SHDG_CTRL register should not be queried at very short
intervals. This is because each query delays the generation of
the shading image. An optimal interval time is 500 ms.
Note
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• The maximum value of GRAB_COUNT depends on the
type of camera and the number of frame buffers that
exist. GRAB_COUNT is corrected to the power of two
automatically.
Note
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• The calculation of shading data is always carried out at
the current resolution setting. If the AOI is later larger
than the window in which correction data was calcu-
lated, none of the pixels lying outside are corrected.
• For Format_7 mode, it is advisable to generate the
shading image in the largest displayable frame format.
This ensures that any smaller AOIs are completely cov-
ered by the shading correction.
• The automatic generation of shading data can also be
enabled when image capture is already running. The
camera then pauses the running image capture for the
time needed for generation and resumes after genera-
tion is completed.
• Shading correction can be combined with the image
mirror, binning and gamma functionality.
• Changing binning modes involves the generation of
new shading reference images due to a change in the
image size.