3. AOS Camera Calibration This section describes when and how to execute AOS camera calibration. 3.1. Overview The geometric positional relationship inside the 3D vision sensor changes due to temperature changes inside and outside the sensor, which may cause an error in the measurement results. To maintain stable measurement, it is necessary to implement regular calibration, and calibrate the geometric positional relationship between the 3D measurement lighting and imaging units of the 3D vision sensor.
In this manual, this calibration is called “AOS camera calibration.” You can execute AOS camera calibration by using the 3D vision sensor to capture the images of the camera calibration target from two viewpoints, i.e., the near imaging position and the far imaging position. 3.2. Executing Timing • When you install the 3D vision sensor for the first time Execute AOS camera calibration in the following timing. • When you change the installation location of the 3D vision sensor • When one month has passed since you executed AOS camera calibration last time You can execute AOS camera calibration in the following three ways. 15 3.3.
Calibration Methods Method Description Manual Calibration The 3D vision sensor or the camera calibration target.is moved manually in order to execute AOS camera calibration. If you use the 3D vision sensor alone for workpiece evaluation, etc., use this method to execute AOS camera calibration. Automatic Calibration (Vision Master) The vision system issues motion instructions to the robot to move the 3D vision sensor attached to the robot in order to execute AOS camera calibration. Automatic Calibration (Robot Master) The robot issues motion instructions to the vision system to move the 3D vision sensor attached to the robot in order to execute AOS camera calibration.
This method allows AOS camera calibration to be executed automatically from the robot program.