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# VNDetectFaceCaptureQualityRequest

A request that produces a floating-point number that represents the capture quality of a face in a photo.

```
class VNDetectFaceCaptureQualityRequest
```

## Overview

This request produces or updates a [`VNFaceObservation`](/documentation/Vision/VNFaceObservation) object’s property [`faceCaptureQuality`](/documentation/Vision/VNFaceObservation/faceCaptureQuality-bjg5) with a floating-point value. The value ranges from `0` to `1`. Faces with quality closer to `1` are better lit, sharper, and more centrally positioned than faces with quality closer to `0`.

If you don’t execute the request, or the request fails, the property [`faceCaptureQuality`](/documentation/Vision/VNFaceObservation/faceCaptureQuality-bjg5) is <doc://com.apple.documentation/documentation/ObjectiveC/nil-227m0>.

## Topics

### Accessing the Results

[`results`](/documentation/Vision/VNDetectFaceCaptureQualityRequest/results)

The results of the face-capture quality request.

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

Face or facial-feature information that an image analysis request detects.

### Identifying Request Revisions

[`VNDetectFaceCaptureQualityRequestRevision2`](/documentation/Vision/VNDetectFaceCaptureQualityRequestRevision2)

Revision 2 of the request algorithm.

[`VNDetectFaceCaptureQualityRequestRevision1`](/documentation/Vision/VNDetectFaceCaptureQualityRequestRevision1)

A constant for specifying revision 1 of the face capture detection request.


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