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# automaticImageScaleEstimationEnabled

A flag that instructs the framework to estimate and set the scale of a detected or tracked image on your behalf.

```
var automaticImageScaleEstimationEnabled: Bool { get set }
```

## Discussion

If set to <doc://com.apple.documentation/documentation/Swift/true>, ARKit uses its knowledge of the world to set an image anchor’s [`estimatedScaleFactor`](/documentation/ARKit/ARImageAnchor/estimatedScaleFactor) property, which corrects the image anchor’s position in the physical environment.

Enable this property when you want to detect different-sized versions of a reference image. ARKit must know the physical size of an image in the real world to accurately estimate its real-world position. Enable this property to tell ARKit to estimate a recognized image’s physical size before it calculates the real-world position.

---

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