# Intensity

Segment objects from measurements using intensities in the different bands/wavelengths

## Parameters

### Expression

Write expression. Band numbers are denoted `b[N]`

e.g. `b1`

and wavelengths are denoted `w[N]`

e.g. `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.

Variable names that can be used in the expression:

`MinValue`

`MaxValue`

`AvarageValue`

### Pretreatments

In top-down applied order ⬇️ , meaning **Savitzky-Golay** is applied first then **Derivative** and so on.

**Savitzky-Golay****Derivative****SNV (Standard Normal Variate)****Logarithm****Center****UV (Unit Variance) scaling**

For more on each type of pretreatment see: Pretreatments

### 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`

For details on each available property see: Object properties Details

### Shrink

Takes away x numbers of pixels at the borders of the objects included in images.

### Separate

**Normal**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.

### Link

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.

## Example

### Using band numbers

**Expression: **`(b10 > 1.5 | b15 < 2) & b20 <= 1.2`

### Using wavelengths

**Expression: **`(w980 > 1.5 | w1024 < 2) & w1200 <= 1.2`

### Use variables for the expression

**Expression: **`w980 > AvarageValue`