<!--
{
  "availability" : [
    "iOS: 18.0.0 -",
    "iPadOS: 18.0.0 -",
    "macOS: 15.0.0 -",
    "tvOS: 18.0.0 -",
    "visionOS: 2.0.0 -",
    "watchOS: 27.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Vision",
  "identifier" : "/documentation/Vision/RequestDescriptor",
  "metadataVersion" : "0.1.0",
  "role" : "Enumeration",
  "symbol" : {
    "kind" : "Enumeration",
    "modules" : [
      "Vision"
    ],
    "preciseIdentifier" : "s:6Vision17RequestDescriptorO"
  },
  "title" : "RequestDescriptor"
}
-->

# RequestDescriptor

A type that describes the request and revision combination.

```
enum RequestDescriptor
```

## Topics

### Getting the still-image descriptor

[`case classifyImageRequest(ClassifyImageRequest.Revision)`](/documentation/Vision/RequestDescriptor/classifyImageRequest(_:))

A descriptor that describes a classify image request.

[`case detectLensSmudgeRequest(DetectLensSmudgeRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectLensSmudgeRequest(_:))

A descriptor that describes a detect lens smudge request.

### Getting the image sequence descriptor

[`case detectDocumentSegmentationRequest(DetectDocumentSegmentationRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectDocumentSegmentationRequest(_:))

A descriptor that describes a detect document segmentation request.

[`case recognizeDocumentsRequest(RecognizeDocumentsRequest.Revision)`](/documentation/Vision/RequestDescriptor/recognizeDocumentsRequest(_:))

[`case generatePersonInstanceMaskRequest(GeneratePersonInstanceMaskRequest.Revision)`](/documentation/Vision/RequestDescriptor/generatePersonInstanceMaskRequest(_:))

A descriptor that describes a generate person instance mask request.

[`case generatePersonSegmentationRequest(GeneratePersonSegmentationRequest.Revision)`](/documentation/Vision/RequestDescriptor/generatePersonSegmentationRequest(_:))

A descriptor that describes a generate person segmentation request.

### Getting the iterative and selected object descriptor

[`case generateIterativeSegmentationRequest(GenerateIterativeSegmentationRequest.Revision)`](/documentation/Vision/RequestDescriptor/generateIterativeSegmentationRequest(_:))

### Getting the image aesthetics descriptor

[`case calculateImageAestheticsScoresRequest(CalculateImageAestheticsScoresRequest.Revision)`](/documentation/Vision/RequestDescriptor/calculateImageAestheticsScoresRequest(_:))

A descriptor that describes a calculate image aesthetics scores request.

### Getting the saliency descriptor

[`case generateAttentionBasedSaliencyImageRequest(GenerateAttentionBasedSaliencyImageRequest.Revision)`](/documentation/Vision/RequestDescriptor/generateAttentionBasedSaliencyImageRequest(_:))

A descriptor that describes a generate attention based saliency image request.

[`case generateObjectnessBasedSaliencyImageRequest(GenerateObjectnessBasedSaliencyImageRequest.Revision)`](/documentation/Vision/RequestDescriptor/generateObjectnessBasedSaliencyImageRequest(_:))

A descriptor that describes a generate objectness based saliency image request.

### Getting the object-tracking descriptor

[`case trackObjectRequest(TrackObjectRequest.Revision)`](/documentation/Vision/RequestDescriptor/trackObjectRequest(_:))

A descriptor that describes a track object request.

[`case trackRectangleRequest(TrackRectangleRequest.Revision)`](/documentation/Vision/RequestDescriptor/trackRectangleRequest(_:))

A descriptor that describes a track rectangles request.

### Getting the face and body detection descriptor

[`case detectFaceCaptureQualityRequest(DetectFaceCaptureQualityRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectFaceCaptureQualityRequest(_:))

A descriptor that describes a detect face capture quality request.

[`case detectFaceLandmarksRequest(DetectFaceLandmarksRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectFaceLandmarksRequest(_:))

A descriptor that describes a detect face landmarks request.

[`case detectFaceRectanglesRequest(DetectFaceRectanglesRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectFaceRectanglesRequest(_:))

A descriptor that describes a detect face rectangles request.

[`case detectHumanRectanglesRequest(DetectHumanRectanglesRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectHumanRectanglesRequest(_:))

A descriptor that describes a detect human rectangles request.

### Getting the body and hand pose detection descriptor

[`case detectHumanBodyPoseRequest(DetectHumanBodyPoseRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectHumanBodyPoseRequest(_:))

A descriptor that describes a detect human body pose request.

[`case detectHumanHandPoseRequest(DetectHumanHandPoseRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectHumanHandPoseRequest(_:))

A descriptor that describes a detect human hand pose request.

[`case detectHumanBodyPose3DRequest(DetectHumanBodyPose3DRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectHumanBodyPose3DRequest(_:))

A descriptor that describes a 3D detect human body pose request.

### Getting the animal detection descriptor

[`case detectAnimalBodyPoseRequest(DetectAnimalBodyPoseRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectAnimalBodyPoseRequest(_:))

A descriptor that describes a detect animal body pose request.

[`case recognizeAnimalsRequest(RecognizeAnimalsRequest.Revision)`](/documentation/Vision/RequestDescriptor/recognizeAnimalsRequest(_:))

A descriptor that describes a recognize animals request.

### Getting the text descriptor

[`case detectTextRectanglesRequest(DetectTextRectanglesRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectTextRectanglesRequest(_:))

A descriptor that describes a detect text rectangles request.

[`case recognizeTextRequest(RecognizeTextRequest.Revision)`](/documentation/Vision/RequestDescriptor/recognizeTextRequest(_:))

A descriptor that describes a recognize text request.

### Getting the image alignment, feature print, and background removal descriptor

[`case trackTranslationalImageRegistrationRequest(TrackTranslationalImageRegistrationRequest.Revision)`](/documentation/Vision/RequestDescriptor/trackTranslationalImageRegistrationRequest(_:))

A descriptor that describes a track translational image request.

[`case trackHomographicImageRegistrationRequest(TrackHomographicImageRegistrationRequest.Revision)`](/documentation/Vision/RequestDescriptor/trackHomographicImageRegistrationRequest(_:))

A descriptor that describes a track homographic image request.

[`case generateForegroundInstanceMaskRequest(GenerateForegroundInstanceMaskRequest.Revision)`](/documentation/Vision/RequestDescriptor/generateForegroundInstanceMaskRequest(_:))

A descriptor that describes a generate foreground instance mask request.

[`case generateImageFeaturePrintRequest(GenerateImageFeaturePrintRequest.Revision)`](/documentation/Vision/RequestDescriptor/generateImageFeaturePrintRequest(_:))

A descriptor that describes a generate image feature print request.

### Getting the trajectory, contour, and horizon detection descriptor

[`case detectTrajectoriesRequest(DetectTrajectoriesRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectTrajectoriesRequest(_:))

A descriptor that describes a detect trajectories request.

[`case detectContoursRequest(DetectContoursRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectContoursRequest(_:))

A descriptor that describes a detect contours request.

[`case detectHorizonRequest(DetectHorizonRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectHorizonRequest(_:))

A descriptor that describes a detect horizon request.

### Getting the optical flow, rectangle and barcode detection descriptor

[`case trackOpticalFlowRequest(TrackOpticalFlowRequest.Revision)`](/documentation/Vision/RequestDescriptor/trackOpticalFlowRequest(_:))

A descriptor that describes a track optical flow request.

[`case detectRectanglesRequest(DetectRectanglesRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectRectanglesRequest(_:))

A descriptor that describes a detect rectangles request.

[`case detectBarcodesRequest(DetectBarcodesRequest.Revision)`](/documentation/Vision/RequestDescriptor/detectBarcodesRequest(_:))

A descriptor that describes a detect barcodes request.

### Getting the machine learning image-analysis descriptor

[`case coreMLRequest(CoreMLRequest.Revision)`](/documentation/Vision/RequestDescriptor/coreMLRequest(_:))

A descriptor that describes a Core ML request.

## Relationships

### Conforms To

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

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

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

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

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

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

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

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)