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# VNDetectedObjectObservation

An observation that provides the position and extent of an image feature that an image- analysis request detects.

```
class VNDetectedObjectObservation
```

## Overview

This class is the observation type that [`VNTrackObjectRequest`](/documentation/Vision/VNTrackObjectRequest) generates. It represents an object that the Vision request detects and tracks.

## Topics

### Creating an Observation

[`init(boundingBox:)`](/documentation/Vision/VNDetectedObjectObservation/init(boundingBox:))

Creates an observation with a bounding box.

[`init(requestRevision:boundingBox:)`](/documentation/Vision/VNDetectedObjectObservation/init(requestRevision:boundingBox:))

Creates an observation with a revision number and bounding box.

### Locating a Detected Object

[`boundingBox`](/documentation/Vision/VNDetectedObjectObservation/boundingBox)

The bounding box of the object that the request detects.

### Accessing an Image Mask

[`globalSegmentationMask`](/documentation/Vision/VNDetectedObjectObservation/globalSegmentationMask)

A resulting pixel buffer from a request to generate a segmentation mask for an image.


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