---
title: VNFeaturePrintObservation
framework: vision
role: symbol
role_heading: Class
path: vision/vnfeatureprintobservation
---

# VNFeaturePrintObservation

An observation that provides the recognized feature print.

## Declaration

```swift
class VNFeaturePrintObservation
```

## Topics

### Fetching Feature Print Data

- [data](vision/vnfeatureprintobservation/data.md)
- [elementCount](vision/vnfeatureprintobservation/elementcount.md)

### Determining Types of Feature Prints

- [elementType](vision/vnfeatureprintobservation/elementtype.md)
- [VNElementType](vision/vnelementtype.md)
- [VNElementTypeSize(_:)](vision/vnelementtypesize(_:).md)

### Computing Distance Between Features

- [computeDistance(_:to:)](vision/vnfeatureprintobservation/computedistance(_:to:).md)

## Relationships

### Inherits From

- [VNObservation](vision/vnobservation.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSCoding](foundation/nscoding.md)
- [NSCopying](foundation/nscopying.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)
- [NSSecureCoding](foundation/nssecurecoding.md)
- [VNRequestRevisionProviding](vision/vnrequestrevisionproviding.md)

## See Also

### Still-image analysis

- [Detecting Objects in Still Images](vision/detecting-objects-in-still-images.md)
- [Classifying images for categorization and search](vision/classifying-images-for-categorization-and-search.md)
- [Analyzing Image Similarity with Feature Print](vision/analyzing-image-similarity-with-feature-print.md)
- [VNRequest](vision/vnrequest.md)
- [VNImageBasedRequest](vision/vnimagebasedrequest.md)
- [VNClassifyImageRequest](vision/vnclassifyimagerequest.md)
- [VNGenerateImageFeaturePrintRequest](vision/vngenerateimagefeatureprintrequest.md)
- [VNImageRequestHandler](vision/vnimagerequesthandler.md)
- [VNObservation](vision/vnobservation.md)