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Adjusting the Detection Settings for Marker Measurement

This documentation describes how to adjust the settings for detecting and measuring reference marks and is only necessary if automatic measurement of the marks fails using the default values.

WARNING
Software malfunction caused by incorrect settings!

  • Creating or modifying files containing settings for marker measurement should only be done by experts.
  • Before modifying settings files, please contact the point electronic support.

Location of the settings files

The settings for detecting and measuring the calibration marks can be found in the XML file containing the "Detection Settings" in the directory:

C:\ProgramData\point electronic\microCAL\DetectionSettings\

Creating a settings file

  1. Create a backup copy of the "DetectionSettings" directory containing all settings files.
  2. Create a copy of an existing settings file in the "DetectionSettings" directory.
  3. Save the copy with a unique filename (filename.xml).
  4. Adjust the parameters in the file.
  5. Restart microCAL.
    The settings file can be selected from the Detection Settings list in the "Settings" group of the Calibration toolbar, and calibration can be performed using the modified settings.

Customizable settings

If the calibration marks are not detected or measured correctly, you can change the following settings:

  • Use the template's automatic resizing for pattern recognition (autoadjust=1)
  • Increase the number of steps for the Hough transform (hough_steps). Note: Higher values result in longer computation times.
  • Decrease the threshold for the correlation coefficient when verifying the measured marker centers (rho_min in crosscorrelation section)
  • Increase the measurement range for verifying the measured marker centers (rho_x and rho_y in crosscorrelation section). Note: Higher values result in longer computation times.
  • Decrease the threshold value for the correlation coefficient during subpixel correlation (rho_min in subpixel section)
  • Increase the measurement range for subpixel correlation (rho_x and rho_y in subpixel section). Note: Higher values result in longer computation times.

A complete description of all parameters can be found here: Detection Settings

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