Image Calibration

The Choose a calibration type dialog box appears when you select Image Calibration in the Image tab of the Processing Functions palette or select Image»Image Calibration.

Note  To edit the settings in the Calibration and Calibration Axis tabs, click Edit Calibration to launch the Calibration wizard.

Main Tab

The following control is available on the Main tab.

• Step Name—Name to give the step.

Calibration Tab

The following controls are available on the Calibration tab.

• Simple Calibration
  • Pixel Type—Indicates if the image has square or nonsquare pixels.
  • Correspondence Image - Real World—Gives the real-world size of a pixel in both the horizontal (x) and vertical (y) directions.
• User Points Calibration
  • Calibration Points—Lists the points you selected for calibration in the Calibration wizard.
  • Image Coordinates—Coordinates of the currently selected calibration point, given as the number of pixels from the origin.
  • Real-World Coordinates—Coordinates of the currently selected calibration point, given as the number of Units from the origin.
  • Unit—Unit of measure you selected in the Calibration wizard.
  • Distortion—Type of distortion you selected in the Calibration wizard, either Perspective or Nonlinear.
• Grid Calibration
  • Pixel Type—Indicates if the image has square or nonsquare pixels.
  • Correspondence Image - Real World—Gives the real-world size of a pixel in both the horizontal (x) and vertical (y) directions.
  • Unit—Unit of measure you selected in the Calibration wizard.
  • Distortion—Type of distortion you selected in the Calibration wizard, either Perspective or Nonlinear.
• Edit Calibration—Displays the Calibration wizard, allowing you to modify the calibration settings you specified.

Axis Tab

The following controls are available on the Axis tab.

• Axis Origin—X- and y-coordinates of the origin you selected in the Calibration wizard.
• Axis Reference—Direction of the y-axis, either Direct or Indirect.
• Angle Relative to Horizontal—Angle of the x-axis of the calibration axis you selected relative to horizontal.
• Preview Corrected Image—Option to preview the image with perspective errors and lens distortion errors corrected.