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# VNDetectBarcodesRequest

A request that detects barcodes in an image.

```
class VNDetectBarcodesRequest
```

## Overview

This request returns an array of [`VNBarcodeObservation`](/documentation/Vision/VNBarcodeObservation) objects, one for each barcode it detects.

## Topics

### Specifying Symbologies

[`supportedSymbologies()`](/documentation/Vision/VNDetectBarcodesRequest/supportedSymbologies())

Returns the barcode symbologies that the request supports.

[`symbologies`](/documentation/Vision/VNDetectBarcodesRequest/symbologies)

The barcode symbologies that the request detects in an image.

[`coalesceCompositeSymbologies`](/documentation/Vision/VNDetectBarcodesRequest/coalesceCompositeSymbologies)

A Boolean value that indicates whether to coalesce multiple codes based on the symbology.

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

The barcode symbologies that the framework detects.

[`supportedSymbologies`](/documentation/Vision/VNDetectBarcodesRequest/supportedSymbologies)

The array of barcode symbologies that the request supports.

### Accessing the Results

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

The results of a barcode detection request.

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

An object that represents barcode information that an image analysis request detects.

### Identifying Request Revisions

[`VNDetectBarcodesRequestRevision3`](/documentation/Vision/VNDetectBarcodesRequestRevision3)

A constant for specifying revision 3 of the barcode detection request.

[`VNDetectBarcodesRequestRevision2`](/documentation/Vision/VNDetectBarcodesRequestRevision2)

A constant for specifying revision 2 of the barcode detection request.

[`VNDetectBarcodesRequestRevision1`](/documentation/Vision/VNDetectBarcodesRequestRevision1)

A constant for specifying revision 1 of the barcode detection request.


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