---
title: VNGenerateObjectnessBasedSaliencyImageRequest
framework: vision
role: symbol
role_heading: Class
path: vision/vngenerateobjectnessbasedsaliencyimagerequest
---

# VNGenerateObjectnessBasedSaliencyImageRequest

A request that generates a heat map that identifies the parts of an image most likely to represent objects.

## Declaration

```swift
class VNGenerateObjectnessBasedSaliencyImageRequest
```

## Overview

Overview The resulting observation, VNSaliencyImageObservation, encodes this data as a heat map, which you can use to highlight regions of interest.

## Topics

### Accessing the Results

- [results](vision/vngenerateobjectnessbasedsaliencyimagerequest/results.md)

### Identifying Request Revisions

- [VNGenerateObjectnessBasedSaliencyImageRequestRevision1](vision/vngenerateobjectnessbasedsaliencyimagerequestrevision1.md)

## Relationships

### Inherits From

- [VNImageBasedRequest](vision/vnimagebasedrequest.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

### Saliency analysis

- [Cropping Images Using Saliency](vision/cropping-images-using-saliency.md)
- [Highlighting Areas of Interest in an Image Using Saliency](vision/highlighting-areas-of-interest-in-an-image-using-saliency.md)
- [VNGenerateAttentionBasedSaliencyImageRequest](vision/vngenerateattentionbasedsaliencyimagerequest.md)
- [VNSaliencyImageObservation](vision/vnsaliencyimageobservation.md)