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# VNObservation

The abstract superclass for analysis results.

```
class VNObservation
```

## Overview

Observations resulting from Vision image analysis requests inherit from this abstract base class. Don’t use this abstract superclass directly.

## Topics

### Creating an Observation

[`init(coder:)`](/documentation/Vision/VNObservation/init(coder:))

### Tracking Observations

[`uuid`](/documentation/Vision/VNObservation/uuid)

A unique identifier assigned to the Vision observation.

### Evaluating Observations

[`timeRange`](/documentation/Vision/VNObservation/timeRange)

The time range of the reported observation.

[`confidence`](/documentation/Vision/VNObservation/confidence)

The level of confidence in the observation’s accuracy.

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

A type alias for the confidence value of an observation.


---

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