---
title: VNConfidence
framework: vision
role: symbol
role_heading: Type Alias
path: vision/vnconfidence
---

# VNConfidence

A type alias for the confidence value of an observation.

## Declaration

```swift
typealias VNConfidence = Float
```

## Discussion

Discussion The Vision framework normalizes this value to [0.0, 1.0] under most circumstances. A value of 0.0 indicates no confidence. A value of 1.0 indicates highest confidence, or the observation doesn’t support or assign meaning to confidence. note: When the results come from a VNCoreMLRequest, Vision forwards confidence values as-is and doesn’t normalize them.

## See Also

### Configuring Detection

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