Model Expression
Segment objects from measurements using expressions and models.
Parameters
Expression
Write the expression for the segmentation, examples can be found below. The following comparators can be used for the expression:
Equals -
=
And -
&
Or -
|
Less than -
<
Less or equal -
<=
Larger -
>
Larger or equal -
>=
Different from -
!=
Model
Select model to apply to the expression.
Min area
The minimum number of pixels for an object to be included.
Max area
The maximum number of pixels for an object to be included.
If 0 no maximum area is defined.
Object filter
Use an expression to further exclude unwanted objects based on shape.
Properties that can be used for the Expression:
Area
Length
Width
Circumference
Regularity
Roundness
Angle
D1
D2
X
Y
MaxBorderDistance
BoundingBoxArea
Shrink
Takes away x numbers of pixels at the borders of the objects included in images.
Examples
Using class
Segment object classified to sample class. Expression: class = sample
Using negative
Segment object not classified. Expression: class != none
Band index comparison
Indexing with 1 based index in band list. Expression (B10 > 1.5 or B15 < 2) and B20 <=1.2)
Band names can also be used instead of band numbers in the example the band names are HE and LE. HE > 20 and LE <40
Wavelength number
Using wavelength number. Expression: (W980 > 1.5 or W1024 < 2) & W1200 <= 1.2