Basler raL2048-48gm User Manual download pdf (Page 191)

AW00118302000 Standard Features

Basler racer GigE 181

Creating a "Usershading" File for Offset Shading Correction

To create a "usershading" file for offset shading correction, perform the following steps:

1. Adjust the lighting, optics, line rate, exposure time control mode, exposure time, gain, and

camera temperature as you would for normal operation.

2. Prevent light from striking the camera’s sensor: Cover the camera lens, close the iris in the

camera lens, or darken the room so that the camera will be capturing lines in complete

darkness.

3. Set the camera’s X Offset and Width parameters so that the entire width of the sensor will be

used during frame acquisition.

Note: You can create a "usershading" file for an AOI that is narrower than the entire width of

the sensor. In this case, however, the "usershading" file will only apply to the narrower AOI or

to smaller included AOIs. We recommend using the entire width of the sensor.

4. Select Offset Shading in the Basler pylon Viewer or via the Basler pylon API.

5. Select "usershading" file in the Basler pylon Viewer or via the Basler pylon API.

6. Go to the Create enumeration in the Basler pylon Viewer and select Once or send a create

command via the Basler pylon API.

7. Perform at least 128 line acquisitions.

To ease acquisition of the required number of lines we recommend to set the line start trigger

mode to off for automatic line start triggering and to set the Height parameter for the frame to at

least 128.

For more information about the line start trigger mode, see Section 8.2.4 on page 87.

For more information about defining a frame, see Section 8.1 on page 75.

After 128 line acquisitions are completed the camera creates the "usershading" file

automatically. The "usershading" file is stored in the camera’s non-volatile memory and is not

lost if the camera power is switched off.

Creating a "usershading" file for offset shading correction will overwrite any

"usershading" file for offset shading correction that is already in the camera’s

memory.

If you want to preserve the previous "usershading" file save it to your PC before

creating the new "usershading" file.

For information about saving a "usershading" file to the PC, see Section 10.8.3.2

on page 183.

Any time you make a change to the line rate, exposure time control mode,

exposure time, gain, or camera temperature, you must create a new

"usershading" file for offset shading correction. Using an out of date "usershading"

file can result in poor image quality.

1 2 ... 186 187 188 189 190 191 192 193 194 195 196 ... 237 238

No comments

Basler raL2048-48gm User Manual Page 191