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# VNTrackHomographicImageRegistrationRequest

An image-analysis request, as a stateful request you track over time, that determines the perspective warp matrix necessary to align the content of two images.

```
class VNTrackHomographicImageRegistrationRequest
```

## Overview

This request is similar to [`VNHomographicImageRegistrationRequest`](/documentation/Vision/VNHomographicImageRegistrationRequest). However, as a [`VNStatefulRequest`](/documentation/Vision/VNStatefulRequest), it automatically computes the registration against the previous frame.

## Topics

### Creating a Homographic Image

[`init()`](/documentation/Vision/VNTrackHomographicImageRegistrationRequest/init())

Creates a new request that tracks the homographic transformation of two images.

[`init(completionHandler:)`](/documentation/Vision/VNTrackHomographicImageRegistrationRequest/init(completionHandler:))

Creates a new request that tracks the homographic transformation of two images, with a system callback on completion.

### Accessing the Results

[`results`](/documentation/Vision/VNTrackHomographicImageRegistrationRequest/results)

The observed homographic image alignment request.


---

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