Precise Calibration - Omron FH-3 Series Reference Manual

Precise Calibration

This corrects for camera tilt, and also corrects image distortion caused by the camera lens. Also, by setting the
calibration, the measurement result can be converted and output as actual dimensions.
A calibration parameter that corrects the X and Y coordinates is generated in this processing item. There is no
correction for angle, area, line and distance.
Make sure to set 5 or more actual coordinates when you perform Precise Calibration.
Calibration is also available for camera image input and the calibration data from just prior to the unit referencing
calibration data becomes effective.
Used in the Following Case
• Processing a trapezoidal image shot tilted to make it easier to inspect
• Processing an image that has lens distortion to make it easier to inspect
• Setting calibration for an image in which there is lens distortion or trapezoidal distortion
Image before conversion
After application of precise calibration
Note
A square-matrix calibration plate pattern (Pattern) printed by the Calibration Plate Print Tool (refer to: the Calibration Plate
Print Tool in the Vision Sensor FH Series Operation Manual for Sysmac Studio (Cat. No. Z343-E1)) can be used in this
processing item.
The accuracy of the calibration will be affected by the accuracy of the Calibration Plate. If the Pattern is printed on paper,
the quality of the paper and/or degree of print jitter also affects the accuracy of the calibration.
If sub-pixel level accuracy is required,use OMRON pattern plate (FZD-CAL 3D Calibration Tool).
FH/FZ5 Processing Item Function Reference Manual
• Shooting the target from a
diagonal
(trapezoidal distortion)
• Lens distortion occurs in the
corners of the image.
• Correcting the image to be
from directly in front
(removing trapezoidal distortion)
• Lens distortion removal
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Precise Calibration