Page 70
Vision Sensor SBSI/SBSC-EN, 8062650 - 1607b - 13/09/2016
Vision Sensor Manual
Minimum required number of point pairs is "6" points
.
The minimum necessary number of points for calibration via point pair list is 6 points. With minimum this
number of points false inputs (like x and y interchanged) can be found by high error values in dialog
"Calibraiton parameters"
Calibration, Calibration parameter (Page 70)
, (if <= 5 points the error values
are always = 0, as no errors can be calculated).
To show the quality of point position (how good point position matches with calculated position) the
points are displayed in the following colors (only meaningful if minimum 6 points).
Color significance of graphical points in image and lines in Point pair list:
Color
Significance
Green
Calibration valid, points accurately positioned
Yellow
Calibration valid, points not accurately positioned
Red
Calibration not valid
In case of yellow point color a yellow line is visible starting in the center of the point. It´s lenght and
direction is a measure for the absolute value and orientation of the error in relation to the position
accuracy of point input in world frame.
If there are big errors, potentially x- and y- coordinate are interchanged with one or some points, or
some points are interchanged completely with others.
In the dialog
Calibration, Calibration parameter (Page 70)
the devaiton values / errors: "Mean", "Min"imum
error and "Max"imum error are displayed. With this values the exact positon input of the existing points
can be optimised.
This calibration method serves beside the absolute coordinate values the orientation of the part to pick
also. (if Contour or Pattern matching is used as detector)
The result coordinate values of the part to pick are served from now on directly in the
coordinate system e.g. of the robot!
4.6.1.6.2.1 Calibration, Calibration parameter
Here, if required , the Z-offset between calibration- and measurement level in Z-direction can be set and
compensated . Also the calibration- and deviation parameters, for optimisation if desired, are displayed.
This kind of calibration is suitable for standard lenses, integrated or C-mount. However it does not work
for telecentric lenses.
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