Resize Polygons

Overview

Scales a list of polygons from their center point. This node is useful for enlarging or shrinking detection areas, such as expanding a face detection region to include more background.

Use Resize Polygons when:

• You need to increase the area of detected polygons for better cropping.
• You want to shrink polygons to focus on the core region of interest.

💡 Tip

Setting a factor above 100% enlarges the polygon, while setting it below 100% shrinks it.

Inputs

Name	Type	Description
polygons	list[polygon]	The list of polygons to be scaled.

Outputs

Name	Type	Description
scaled_polygons	list[polygon]	The resulting list of resized polygons.

Parameters

Parameter	Default	Valid values	Unit	Tunable
Horizontal scale	100	5 – 1000	%	✅
Vertical scale	100	5 – 1000	%	✅

Horizontal scale

The scaling factor applied to the horizontal dimension of each polygon. Values greater than 100% enlarge the polygon, values below 100% shrink it. The polygon is resized from its center.

Vertical scale

The scaling factor applied to the vertical dimension of each polygon. Values greater than 100% enlarge the polygon, values below 100% shrink it. The polygon is resized from its center.

Example

Enlarge detection regions

A model detects objects but the bounding boxes are too tight. Scaling both factors to 160% provides more context.

Configuration:

• Horizontal scale: 160
• Vertical scale: 160

Result: Each polygon in the list is 60% larger than the original.

A polygon scaled to 160% from its center. The original outline is shown dashed in gray.

Related links

Reference:

• Merge Polygons — combines multiple polygon lists into one
• Move Polygon — shifts a polygon's position