Advantech VisionNavi User Manual page 50

The ratio of the extraction points necessary for contour generation. When set to 1, it
is necessary to obtain extraction points in all the cells of the outline extraction guide
frame. By lowering the value, it is possible to extract even if the contour is discountin-
uous.
[Distance th]
Points with large errors from the approximate line obtained by geometric fitting can
be excluded from calculation of the final detection result.Set threshold to exclude by
ratio to [Width1] value.
[Compare mode] (When selecting the difference from the master image)
Compare abs
··················Determine the absolute value of the error from the approximate line.
Compare tolerance(+/-)
··················The error from the approximate line is judged by ± tolerance.
[Unit conversion]
Convert the detection result to the specified unit with the mm / pix information set with
the camera setting tool. Measure burr / crack
Detection result
The item list of the detection result with this tool is as follows.
It is possible to make a decision using these feature parameter.
(1) In case of judgment by difference with master image
Line
Position diff
Angle diff
Center X
Center Y
Radius diff
(2) In case of judgment by measurement value
Line
Center X
Center Y
Angle
Num of contour
Integrity
Minor axis (ellipse)
Angle?ellipse)
Ellipticity
Num of contour
Integrity
VisionNavi User Manual
Circle Arc
Radius diff
Circle Arc
Center X Center X
Center Y Center Y
Radius Radius
Circularity Num of contour
Major axis (ellipse) Integrity
Aspect ratio
Num of contour
Integrity
44
Rectangle
Rectangle
Center X
Center Y
Length 1
Length 2
Angle