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# VNContour

A class that represents a detected contour in an image.

```
class VNContour
```

## Topics

### Inspecting the Contour

[`aspectRatio`](/documentation/Vision/VNContour/aspectRatio)

The aspect ratio of the contour.

[`indexPath`](/documentation/Vision/VNContour/indexPath)

The contour object’s index path.

[`normalizedPath`](/documentation/Vision/VNContour/normalizedPath)

The contour object as a path in normalized coordinates.

[`pointCount`](/documentation/Vision/VNContour/pointCount)

The contour’s number of points.

[`normalizedPoints`](/documentation/Vision/VNContour/normalizedPoints-8n2s5)

The contour’s array of points in normalized coordinates.

[`normalizedPoints`](/documentation/Vision/VNContour/normalizedPoints-2orqj)

The contour’s array of points in normalized coordinates.

[`polygonApproximation(epsilon:)`](/documentation/Vision/VNContour/polygonApproximation(epsilon:))

Simplifies the contour to a polygon using a Ramer-Douglas-Peucker algorithm.

### Accessing Child Contours

[`childContourCount`](/documentation/Vision/VNContour/childContourCount)

The total number of detected child contours.

[`childContours`](/documentation/Vision/VNContour/childContours)

An array of contours that this contour encloses.

[`childContour(at:)`](/documentation/Vision/VNContour/childContour(at:))

Retrieves the child contour object at the specified index.


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