Calibration Tools - N Point

The N Point Calibration Tool is used to construct a calibration file, using 2 to 16 input features and their associated real-world coordinates.This calibration file can be exported and applied as a Calibration Type in the Set Up Image step and used in other jobs.

Tip: After constructing the calibration, it is recommended that you save the job file. For subsequent calibrations, you can simply load the calibration job, acquire the image and then auto export the updated calibration file to all of the jobs that reference this calibration file.

This tool is useful in situations where you have a part or object of known real-world dimensions, such as from a CAD drawing, and want to apply those values as a calibration. In this type of application, an image of the part or object is acquired by the In-Sight vision system, and the real-world values are associated with the image pixel coordinates. Stored on the vision system's local file system, this allows the resulting calibration to be applied to other jobs.

Note:

This tool requires other Location and/or Inspection Tools to be used as inputs to define the points for the calibration. Assemble the necessary Location and/or Inspection Tools that will be used as inputs before adding this tool.
When using an N Point or Sequential N Point Calibration Tool, the physical and optical set-up (the lens, vision system and the physical relationship between the vision system and the scene being acquired) must be the same for both the calibration and run-time operation. If any of these items is altered, the system must be re-calibrated. Therefore, it is recommended that the same vision system and lens be used to both calibrate and process the run-time images. The vision system and lens must also retain their original set-up and calibration settings. For example, changing the acquisition format (by altering the resolution) or moving the vision system will invalidate the computed 2D transformation that maps pixel to real-world coordinates.