---
title: "polygonApproximation(epsilon:)"
framework: vision
role: symbol
role_heading: Instance Method
path: "vision/contoursobservation/contour/polygonapproximation(epsilon:)"
---

# polygonApproximation(epsilon:)

## Declaration

```swift
func polygonApproximation(epsilon: Float) throws -> ContoursObservation.Contour
```