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# estimatedScaleFactor

The estimated scale factor between the tracked image’s physical size and the reference image’s size.

```
var estimatedScaleFactor: Float { get }
```

## Discussion

The scale factor is between the tracked image’s size and the [`physicalSize`](/documentation/ARKit/ReferenceImage/physicalSize) property on the reference image you supply when you create an image tracking provider. For example, if you supply a reference image and the version that appears in front of someone is three times larger, this property is `3.0`.

---

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