Isolate Polygon

Overview

The Isolate Polygon node selects a single polygon from a list based on its area or detection probability. It is typically used to extract the most relevant detection for further processing.

Use Isolate Polygon when:

• You have multiple detections and only need the largest one.
• You want to find the object with the highest confidence score.

💡 Tip

Selecting by "Area" is useful for size-based filtering, while "Probability" helps in finding the most certain AI detection.

Inputs

Name	Type	Description
input	list[polygon]	Receives a list of polygons.

Outputs

Name	Type	Description
output	polygon	Returns a single polygon based on the configuration.

Parameters

Parameter	Default	Valid values	Tunable
Polygon attribute	area	area, probability	❌
Value	max	min, max	❌

Polygon attribute

The attribute used to compare polygons. "Area" uses the physical size, while "Probability" uses the AI confidence score.

Value

Whether to pick the polygon with the lowest (min) or highest (max) value of the selected attribute.

Example

Isolate Largest Detection

A node outputs several detected objects. You only want to analyze the largest one to ensure it's the main subject.

Configuration:

• Polygon attribute: area
• Value: max

Result: The node returns the polygon with the largest surface area from the input list.

Related links

Reference:

• Polygon Threshold — filters a list of polygons based on spatial properties
• Get Item from List — retrieves a list item by its index