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# VisionRequest

A type for image-analysis requests.

```
protocol VisionRequest : CustomStringConvertible, Hashable, Sendable
```

## Topics

### Getting the compute device

[`computeDevice(for:)`](/documentation/Vision/VisionRequest/computeDevice(for:))

Returns the compute device for a compute stage.

[`supportedComputeStageDevices`](/documentation/Vision/VisionRequest/supportedComputeStageDevices)

The collection of compute devices per stage that a request supports.

[`ComputeStage`](/documentation/Vision/ComputeStage)

Types that represent the compute stage.

### Setting the compute device

[`setComputeDevice(_:for:)`](/documentation/Vision/VisionRequest/setComputeDevice(_:for:))

Assigns a compute device for a compute stage.

### Getting the descriptor

[`descriptor`](/documentation/Vision/VisionRequest/descriptor)

An enum that identifies the request and request revision.

### Performing the request

[`Result`](/documentation/Vision/VisionRequest/Result)

An associated type that represents the result.

[`VisionResult`](/documentation/Vision/VisionResult)

The result the framework produces by performing a request.

## Relationships

### Conforming Types

[`DetectHumanRectanglesRequest`](/documentation/Vision/DetectHumanRectanglesRequest)

[`GenerateIterativeSegmentationRequest`](/documentation/Vision/GenerateIterativeSegmentationRequest)

[`GenerateObjectnessBasedSaliencyImageRequest`](/documentation/Vision/GenerateObjectnessBasedSaliencyImageRequest)

[`TrackOpticalFlowRequest`](/documentation/Vision/TrackOpticalFlowRequest)

[`DetectRectanglesRequest`](/documentation/Vision/DetectRectanglesRequest)

[`CalculateImageAestheticsScoresRequest`](/documentation/Vision/CalculateImageAestheticsScoresRequest)

[`RecognizeAnimalsRequest`](/documentation/Vision/RecognizeAnimalsRequest)

[`ClassifyImageRequest`](/documentation/Vision/ClassifyImageRequest)

[`TrackTranslationalImageRegistrationRequest`](/documentation/Vision/TrackTranslationalImageRegistrationRequest)

[`DetectTextRectanglesRequest`](/documentation/Vision/DetectTextRectanglesRequest)

[`RecognizeDocumentsRequest`](/documentation/Vision/RecognizeDocumentsRequest)

[`TrackObjectRequest`](/documentation/Vision/TrackObjectRequest)

[`GenerateAttentionBasedSaliencyImageRequest`](/documentation/Vision/GenerateAttentionBasedSaliencyImageRequest)

[`GenerateImageFeaturePrintRequest`](/documentation/Vision/GenerateImageFeaturePrintRequest)

[`GenerateForegroundInstanceMaskRequest`](/documentation/Vision/GenerateForegroundInstanceMaskRequest)

[`DetectFaceCaptureQualityRequest`](/documentation/Vision/DetectFaceCaptureQualityRequest)

[`RecognizeTextRequest`](/documentation/Vision/RecognizeTextRequest)

[`DetectContoursRequest`](/documentation/Vision/DetectContoursRequest)

[`DetectHorizonRequest`](/documentation/Vision/DetectHorizonRequest)

[`DetectFaceRectanglesRequest`](/documentation/Vision/DetectFaceRectanglesRequest)

[`TrackRectangleRequest`](/documentation/Vision/TrackRectangleRequest)

[`DetectTrajectoriesRequest`](/documentation/Vision/DetectTrajectoriesRequest)

[`DetectBarcodesRequest`](/documentation/Vision/DetectBarcodesRequest)

[`DetectLensSmudgeRequest`](/documentation/Vision/DetectLensSmudgeRequest)

[`DetectHumanHandPoseRequest`](/documentation/Vision/DetectHumanHandPoseRequest)

[`GeneratePersonSegmentationRequest`](/documentation/Vision/GeneratePersonSegmentationRequest)

[`DetectHumanBodyPose3DRequest`](/documentation/Vision/DetectHumanBodyPose3DRequest)

[`DetectHumanBodyPoseRequest`](/documentation/Vision/DetectHumanBodyPoseRequest)

[`DetectFaceLandmarksRequest`](/documentation/Vision/DetectFaceLandmarksRequest)

[`DetectAnimalBodyPoseRequest`](/documentation/Vision/DetectAnimalBodyPoseRequest)

[`TrackHomographicImageRegistrationRequest`](/documentation/Vision/TrackHomographicImageRegistrationRequest)

[`DetectDocumentSegmentationRequest`](/documentation/Vision/DetectDocumentSegmentationRequest)

[`GeneratePersonInstanceMaskRequest`](/documentation/Vision/GeneratePersonInstanceMaskRequest)

[`CoreMLRequest`](/documentation/Vision/CoreMLRequest)

### Inherits From

[`Equatable`](/documentation/Swift/Equatable)

[`Hashable`](/documentation/Swift/Hashable)

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

[`Sendable`](/documentation/Swift/Sendable)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

### Inherited By

[`TargetedRequest`](/documentation/Vision/TargetedRequest)

[`ImageProcessingRequest`](/documentation/Vision/ImageProcessingRequest)

[`StatefulRequest`](/documentation/Vision/StatefulRequest)

---

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