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# VNImageAlignmentObservation

The abstract superclass for image-analysis results that describe the relative alignment of two images.

```
class VNImageAlignmentObservation
```

## Overview

This abstract superclass forms the basis of image alignment or registration output. You receive its subclasses, such as [`VNImageTranslationAlignmentObservation`](/documentation/Vision/VNImageTranslationAlignmentObservation) and [`VNImageHomographicAlignmentObservation`](/documentation/Vision/VNImageHomographicAlignmentObservation), by performing specific registration requests. Don’t create one of these classes yourself.

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