---
title: intrinsicMatrixReferenceDimensions
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avcameracalibrationdata/intrinsicmatrixreferencedimensions
---

# intrinsicMatrixReferenceDimensions

The image dimensions to which the camera’s intrinsic matrix values are relative.

## Declaration

```swift
var intrinsicMatrixReferenceDimensions: CGSize { get }
```

## Discussion

Discussion The intrinsicMatrix property measures focal length and principal point offset in pixels, but those values are meaningful only in the context of an image of this size.

## See Also

### Mapping pixels to scene geometry

- [intrinsicMatrix](avfoundation/avcameracalibrationdata/intrinsicmatrix.md)
- [extrinsicMatrix](avfoundation/avcameracalibrationdata/extrinsicmatrix.md)
- [pixelSize](avfoundation/avcameracalibrationdata/pixelsize.md)