Segment objects from measurements using expressions and models.
Write the expression for the segmentation, examples can be found below. The following comparators can be used for the expression:
Standard arithmetic (
* …) and comparison operators (
< …) as well as some mathematical expressions (…) and constant values can be used in expressions.
Raised to a power
TRUE if any of the conditions separated by OR is TRUE
TRUE if all the conditions separated by AND is TRUE
Not equal to
Less than or equal to
Greater than or equal to
Always evaluates to TRUE
Always evaluates to FALSE
approximated to 3.14159
Select model to apply to the expression.
The minimum number of pixels for an object to be included.
The maximum number of pixels for an object to be included.
If 0 no maximum area is defined.
Use an expression to further exclude unwanted objects based on shape.
Properties that can be used for the Expression:
For details on each available property see: Object properties Details
Takes away numbers of pixels at the borders of the objects included in images.
Only visible when applicable
Link output objects from two or more segmentations to top segmentation. Descriptors can then be added to the common object output and will be calculated for objects from all segmentations.
The segmentations must be at same level to be available for linking.
Segment object classified to sample class. Expression:
class = sample
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
Using wavelength number. Expression:
(W980 > 1.5 or W1024 < 2) & W1200 <= 1.2