Schäfter+Kirchhoff SK12240U3KOC-LB, Instruction Manual, Page: 17 / 34

Camera Control and Performing a Scan
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Instruction Manual
SK12240U3KOC-LB
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Instruction Manual SK12240U3KOC-LB © 2020-03 E
Camera Contr
ol and Performing a Scan
Shading Correction Memories and API Functions
As an alternative to the user dialog, a new shading correction reference signal can also be generated using API
(Application Programming Interface) functions. The relationship between the memory locations and the related
API functions are shown in the following figure. The API functions are included in the SK91USB3-WIN software
package. For more information, refer to the
SK91USB3-WIN manual .
Structure of the shading correction memories (SCM) and the related API functions for memory handling
„
Optimum brightness adjustment, Integration Time
The brightness distribution of the line signal is influenced not only by the integration time, but also by the illumi-
nation and the aperture setting. It should be noted that the aperture setting affects the depth of field and thus the
overall quality of the image.
The line signal is optimal if the signal from the brightest area of the object corresponds to 95% of the maximum
output value. At 8-bit digitizing depth, 256 brightness levels are available, at 12-bit 4096. In this setting, optimum
signal sensitivity is achieved and overexposure or even blooming is avoided.
Open the Camera Control dialog.
Menu Edit -> Operation Parameters or [F4]
•
The integration time can be set by two vertical sliders
or two input fields in the section Integration Time of
this dialog. The left slider is for coarser the right for
finer adjustments.
• The current line frequency is displayed in the Line
Frequency status field.
•
For cameras with integration control function
(shutter), it is possible to shorten the integration time
without increasing the line frequency. This integration
control mode is activated as soon as the maximum
line frequency of the camera is reached by shortening
the integration time or by checking
Decoupl. LF and
thus the integration time is decoupled from the line
frequency.
The Default button sets the integration time to the
minimum exposure period that is determined from the
maximum line frequency.
Reset restores the start values.
Cancel closes the dialog without changes.
OK stores the integration time values and closes the
dialog.
For synchronization settings, see section
Synchroni-
zation of the Image Acquisition with the Feed Rate of
the Object (p. 18)
.
A camera signal with insufficient level: The
integration time is too short, since only about
50% of the gray levels are used.
Optimized level of the camera signal after incre-
asing the integration time by a factor of 4 to 95
% of the available scale.
SkLineScan Camera Control dialog