Basler Vision Technologies Sprint Series, User Manual

Page: 133 / 236

Features
Basler sprint Mono Cameras 123
6.3.2 Generating and Saving User Shading Correction
Values
This section includes procedures for generating the user DSNU and PRNU shading correction
values that will be stored in the user shading correction values file. If you will be setting the camera
to do DSNU correction only, then you only need to perform the DSNU procedure. If you will be
setting the camera to do PRNU correction only, then you only need to perform the PRNU procedure.
And if you will be setting the camera to do both DSNU and PRNU correction, you must follow both
procedures.
Generating and Saving User DSNU Shading Correction Values
The procedure below describes how to generate user DSNU shading correction values. When you
generate the values, they will automatically be stored in the camera’s user shading value file.
You should be aware that the camera uses one set of DSNU values when it is operating in single
line acquisition mode and a different set of values when it is operating in any one of the other line
acquisition modes (see Chapter 3 on
page 39 for more information about line acquisition modes).
This means that:
„
If you will always be operating the camera in single line acquisition mode, you should set the
camera for single line acquisition mode and then follow the steps below one time.
„
If you will never be operating the camera in single line acquisition mode, you should set the
camera for any one of the other acquisition modes and then follow the steps below one time.
„
If you will sometimes operate the camera in single line acquisition mode and other times
operate the camera in one of the other modes, you should first set the camera for single line
acquisition mode and follow the steps below. You should then, set the camera for any one of
the other acquisition modes and you should go through the steps a second time.
(The camera’s user shading values file has one area where it holds the DSNU values it uses for
single line mode and another area where it stores the values for all of the other modes.)
To generate a set of user DSNU values:
1. Set the camera for the desired line acquisition mode.
2. Make sure the area of interest parameters are set so that the camera will use the full length of
the sensor (see Section 6.2 on page 118 ).
3. Ensure that the camera will be capturing lines in complete darkness by covering the camera
lens, closing the iris in the lens, or darkening the room.
4. Begin acquiring lines either by generating an ExSync signal to trigger line acquisition or by
setting the camera for a free run exposure time control mode.
5. Signal the camera to generate a set of DSNU values:
a. You can start the generation of a set of DSNU values with the Camera Configuration Tool
Plus (see Section 7.1 on page 156 ). With the CCT+, set the value of the Generate
parameter in the DSNU & PRNU Shading Correction parameters group to Generate DSNU
Values.