Segment objects from measurements using intensities in the different bands/wavelengths
Write expression. Band numbers are denoted
b1 and wavelengths are denoted
w1. 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
Variable names that can be used in the expression:
Apply one or more pretreatments, see Pretreatments
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 x numbers of pixels at the borders of the objects included in images.
Can have both separated and combined objects.
Separate adjacent objects
All objects are defined separately.
Merge all objects into one
All objects are defined as one.
Merge all objects per row
All objects per row segmentation are defined as one.
Merge all objects per column
All objects per column segmentation are defined as one.
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.
Using band numbers
(b10 > 1.5 | b15 < 2) & b20 <= 1.2
(w980 >1.5 | w1024 <2) & w1200 <=1.2
Use variables for the expression
w980 > AvarageValue