---
title: VNAspectRatio
framework: vision
role: symbol
role_heading: Type Alias
path: vision/vnaspectratio
---

# VNAspectRatio

A type alias for expressing rectangle aspect ratios in Vision.

## Declaration

```swift
typealias VNAspectRatio = Float
```

## Discussion

Discussion The value is a float, but limited to a range of 0.0 to 1.0, inclusive, with the default of 0.5 indicating a square image. It defines aspect ratio as the shorter dimension over the longer dimension.

## See Also

### Configuring Detection

- [minimumAspectRatio](vision/vndetectrectanglesrequest/minimumaspectratio.md)
- [maximumAspectRatio](vision/vndetectrectanglesrequest/maximumaspectratio.md)
- [quadratureTolerance](vision/vndetectrectanglesrequest/quadraturetolerance.md)
- [VNDegrees](vision/vndegrees.md)
- [minimumSize](vision/vndetectrectanglesrequest/minimumsize.md)
- [minimumConfidence](vision/vndetectrectanglesrequest/minimumconfidence.md)
- [VNConfidence](vision/vnconfidence.md)
- [maximumObservations](vision/vndetectrectanglesrequest/maximumobservations.md)