Basler raL2048-48gm User Manual download pdf (Page 190)

Standard Features AW00118302000

180 Basler racer GigE

10.8.3 Default Shading Set File and

User Shading Set File

For each type of shading correction, two types of shading set files are available in the camera’s

nonvolatile memory:

 The first type of shading set file is called the "defaultshading" file. One "defaultshading" file is

available for offset shading correction and another one for gain shading correction.

A "defaultshading" file contains a complete collection of the values needed to perform either

offset shading or gain shading correction. The values in the files are generated during the

camera’s factory setup procedure and they essentially serve as default shading correction

values. The values are optimized for performing shading correction with "standard" optics and

lighting. Using the factory values will give you reasonable shading correction performance in

most situations. One advantage of the factory values is that they serve as a good default. The

"defaultshading" files are in a protected area of the camera’s memory and can’t be changed.

"Defaultshading" files are always enabled. When "usershading" files are also enabled, they will

supplement the default shading correction by modifying the default correction values.

 The second type of shading set file is called the "usershading" file. One "usershading" file is

available for offset shading correction and another one for gain shading correction.

Like a "defaultshading" file, a "usershading" file also holds a complete collection of the values

needed to perform either offset shading or gain shading correction. The values stored in the files

must, however, be generated by the camera user. When the values are generated the camera

must operate under its real world conditions. The "usershading" files contain the shading

correction values that will normally be used for day-to-day camera operation. A procedure

describing how to generate the values in the files appears below.

10.8.3.1 Creating a "Usershading" File

To create a "usershading" file and enable it, you must take the steps listed below. We strongly

recommend that you read through all of the steps and read all of the other information in this section

before you attempt to do shading correction.

When you create a "usershading" file you must make sure to create correction values for all of the

pixels in the sensor’s line regardless of how you plan to use the camera during normal operation.

"Defaultshading" files are always enabled. When "usershading" files are also

enabled, they will supplement the default shading correction by modifying the

default correction values.

The steps below are intended to give you the basic knowledge needed to create

a "usershading" file and to activate it. A code sample that includes the

complete details of how to create a usershading file and how to enable

shading correction on a camera is included with the Basler pylon SDK.

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Basler raL2048-48gm User Manual Page 190