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# VNSaliencyImageObservation

An observation that contains a grayscale heat map of important areas across an image.

```
class VNSaliencyImageObservation
```

## Overview

The heat map is a <doc://com.apple.documentation/documentation/CoreVideo/CVPixelBuffer> in a one-component floating-point pixel format. Its dimensions are 64 x 64 when fetched in real time, or 68 x 68 when requested in its deferred form.

## Topics

### Locating Salient Regions

[`salientObjects`](/documentation/Vision/VNSaliencyImageObservation/salientObjects)

A collection of objects describing the distinct areas of the saliency heat map.


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