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Vision Sensor SBSI/SBSC-EN, 8062650 - 1607b - 13/09/2016 Page 129
Vision Sensor Manual
List of features / first level: Base parameter, and BLOB type
Feature Function
Pipette- button (Feature)
With a click to the "Pipette button" the cursor changes into a pipette
symbol. By moving the cursor and clicking to any position (pixel)
inside a valid (green) BLOB, the limits of the selected feature are
adjusted automatically to +/- 10% of the value of the BLOB clicked to.
E.g.: with selected feature "Area" and clicking with Pipette active to
any pixel inside the BLOB , the lower and upper limit of area is set to
+/- 10%. of the found number of pixels of the selected BLOB.
Checkbox (Feature, default:
active)
active: feature is calculated, filtered (limits adjustable), and available
for data output.
inactive: feature is calculated, but NOT filtered, but anyway available
for data output.
- Area Area of the BLOB, without holes, in pixels.
- Area (incl. holes) Area of the BLOB, including holes, in pixels.
- Contour length Number of pixels of outer contour of the BLOB.
- Compactness
Compactness of BLOB (Circle = 1, all other >1)
The stronger the shape of the BLOB deviates from an ideal circle the
larger the value of compactness will be. Range of slider: 1 -100
(clipped at 100, BLOBs with higher values are marked as invalid)
- Center of gravity X X- coordinate of center of gravity of BLOB
- Center of gravity Y Y- coordinate of center of gravity of BLOB
BLOB type /
Geometric Model
Function
Some features are calculated based on a given geometric model, e.g. eccentricity is based on a ellipse fit
to the object
- Rectangle, paraxial (R1)
Enclosing rectangle parallel to Y- axis and X- axis. Outliers are not
eliminated.
- Rectangle, min. area (R2)
Enclosing rectangle with smallest area. Outliers are not eliminated.
- Ellipse, equivalent (E1)
Equivalent ellipse, based on moments of area.
List of features / second level: BLOB type parameter
Feature Relevant for Function