---
title: VNStatefulRequest
framework: vision
role: symbol
role_heading: Class
path: vision/vnstatefulrequest
---

# VNStatefulRequest

An abstract request type that builds evidence of a condition over time.

## Declaration

```swift
class VNStatefulRequest
```

## Topics

### Initializing a Request

- [init(frameAnalysisSpacing:completionHandler:)](vision/vnstatefulrequest/init(frameanalysisspacing:completionhandler:).md)

### Configuring the Request

- [minimumLatencyFrameCount](vision/vnstatefulrequest/minimumlatencyframecount.md)
- [frameAnalysisSpacing](vision/vnstatefulrequest/frameanalysisspacing.md)

## Relationships

### Inherits From

- [VNImageBasedRequest](vision/vnimagebasedrequest.md)

### Inherited By

- [VNDetectHumanBodyPose3DRequest](vision/vndetecthumanbodypose3drequest.md)
- [VNDetectTrajectoriesRequest](vision/vndetecttrajectoriesrequest.md)
- [VNGeneratePersonSegmentationRequest](vision/vngeneratepersonsegmentationrequest.md)
- [VNTrackHomographicImageRegistrationRequest](vision/vntrackhomographicimageregistrationrequest.md)
- [VNTrackOpticalFlowRequest](vision/vntrackopticalflowrequest.md)
- [VNTrackTranslationalImageRegistrationRequest](vision/vntracktranslationalimageregistrationrequest.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSCopying](foundation/nscopying.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)

## See Also

### Image sequence analysis

- [Applying Matte Effects to People in Images and Video](vision/applying-matte-effects-to-people-in-images-and-video.md)
- [Detecting human actions in a live video feed](createml/detecting-human-actions-in-a-live-video-feed.md)
- [Segmenting and colorizing individuals from a surrounding scene](vision/segmenting-and-colorizing-individuals-from-a-surrounding-scene.md)
- [VNGeneratePersonSegmentationRequest](vision/vngeneratepersonsegmentationrequest.md)
- [VNGeneratePersonInstanceMaskRequest](vision/vngeneratepersoninstancemaskrequest.md)
- [VNDetectDocumentSegmentationRequest](vision/vndetectdocumentsegmentationrequest.md)
- [VNSequenceRequestHandler](vision/vnsequencerequesthandler.md)