Hardware manual

Line Find Impact Reference Guide
Datalogic Automation Inc. 3-76
Edge Detection
Method
Gradient Edges or Grey Level Edges
Gradient detection generally provides more consistent results. In some
cases Gradient detection can pick up extra edges in a noisy image and
Grey Level detection may offer better control.
See “Edge Detection Method” on page 3-78.
Edge Detection
Sensitivity
The sensitivity level determines the transition level necessary for detec-
tion. A higher value detects less well-defined edges.
Fixed Gradient
Threshold Percent-
age
The gradient threshold value for Gradient Edges Detection Method
Fixed Grey Level
Threshold Percent-
age
The grey level threshold value for Grey Level Edges Detection Method
Noise Level The amount of background noise present in the image.
The No Noise setting allows the tool to find edges that are close together
since there isn’t as much background noise in the image.
The Very High Noise setting means there is more noise in the image so
it’s harder for the tool to find edges that are close together (edges along
the ROI must be farther apart).
Sampling Percent The row sampling rate - for example, 100 samples every row, 50 sam-
ples every other row, 0 samples a minimum of 2 rows.
Outlier Distance
Threshold
Outlying points beyond this distance are not included in the found line
Enable Angle
Range Check
If True, the Output Origin must lie within the Line Angle Range
Line Angle Range The maximum angle, in degrees, that the Output Origin may rotate for
the tool to pass. The parameters are minus, nominal, plus, include end,
and include start.
Enable Line Length
Check
If True, the found line’s length must lie within the Line Length Tolerance.
Line Length Toler-
ance
If the found line’s length exceeds this value, the tool fails. The parame-
ters are minus, nominal, and plus.
Enable Gap Length
Check
If True, the maximum gap length in the found line must be less than the
Max Gap Length
Max Gap Length The maximum allowed gap between fitted points along the line segment,
in real world units. Gaps are formed by missing edge points or outliers
caused by bumps or breaks in the edge. Gaps must exceed this max
length to be detected. If any gaps are detected, then the tool fails. If this
value is less than 1.5*Sampling Rate*pixel_size, than the larger value is
used instead.
Enable Straightness
Check
If True, the found line must have a straightness error less than Max
Straightness Error
Input Name What it is