Image Acquisition
Calibration
First, choose the description file for your calibration plate and the calibration plate Thickness (in mm). The name of the description file indicates the size of the plate and the file extension indicates the type of the calibration plate. In particular, the file ending .cpd is used for calibration plates with hexagonally arranged marks and the file extension .descr is used for calibration plates with rectangularly arranged marks. Note that calibration plates with hexagonally arranged marks usually have light marks on a dark background. Nevertheless, also calibration plates with dark marks on a light background are available. Then, you have to choose a description file with the filename ending "_dark_on_light". Calibration plates with rectangularly arranged marks always have dark marks on a light background. With the parameter Thickness, you can modify the position of the world coordinate system and the measurement plane, which is located beneath the calibration plate surface by the value of Thickness in the
Reference Image (page 195).