---
title: TrackHomographicImageRegistrationRequest
framework: vision
role: symbol
role_heading: Class
path: vision/trackhomographicimageregistrationrequest
---

# TrackHomographicImageRegistrationRequest

An image-analysis request that you track over time to determine the perspective warp matrix necessary to align the content of two images.

## Declaration

```swift
final class TrackHomographicImageRegistrationRequest
```

## Overview

Overview This request generates an ImageHomographicAlignmentObservation object that describes the matrix data the request detects.

## Topics

### Creating a request

- [init(_:frameAnalysisSpacing:)](vision/trackhomographicimageregistrationrequest/init(_:frameanalysisspacing:).md)

### Performing a request

- [perform(on:orientation:)](vision/imageprocessingrequest/perform(on:orientation:)-80bya.md)
- [perform(on:orientation:)](vision/imageprocessingrequest/perform(on:orientation:)-3f3f1.md)
- [perform(on:orientation:)](vision/imageprocessingrequest/perform(on:orientation:)-qxxx.md)
- [perform(on:orientation:)](vision/imageprocessingrequest/perform(on:orientation:)-xspx.md)
- [perform(on:orientation:)](vision/imageprocessingrequest/perform(on:orientation:)-3hddl.md)
- [perform(on:orientation:)](vision/imageprocessingrequest/perform(on:orientation:)-85ex1.md)

### Understanding the result

- [ImageHomographicAlignmentObservation](vision/imagehomographicalignmentobservation.md)

### Getting the revision

- [revision](vision/trackhomographicimageregistrationrequest/revision-swift.property.md)
- [supportedRevisions](vision/trackhomographicimageregistrationrequest/supportedrevisions.md)
- [TrackHomographicImageRegistrationRequest.Revision](vision/trackhomographicimageregistrationrequest/revision-swift.enum.md)

## Relationships

### Conforms To

- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [ImageProcessingRequest](vision/imageprocessingrequest.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)
- [StatefulRequest](vision/statefulrequest.md)
- [TargetedRequest](vision/targetedrequest.md)
- [VisionRequest](vision/visionrequest.md)

## See Also

### Image registration and comparison

- [GenerateImageFeaturePrintRequest](vision/generateimagefeatureprintrequest.md)
- [TrackTranslationalImageRegistrationRequest](vision/tracktranslationalimageregistrationrequest.md)