Class

VNObservation

The abstract superclass for analysis results.

Declaration

@interface VNObservation : NSObject

Overview

Observations resulting from Vision image analysis requests inherit from this abstract base class. Do not use this abstract superclass directly.

Topics

Tracking Observations

uuid

A unique identifier assigned to the Vision observation.

Evaluating Observations

confidence

The level of confidence in the observation's accuracy, normalized to [0, 1.0].

VNConfidence

A type alias for the confidence value of an observation.

Relationships

Inherits From

See Also

Still Image Analysis

Detecting Objects in Still Images

Locate and demarcate rectangles, faces, barcodes, and text in images using the Vision framework.

VNImageRequestHandler

An object that processes one or more image analysis requests pertaining to a single image.

VNImageBasedRequest

The abstract superclass for image analysis requests that focus on a specific part of an image.

VNClassifyImageRequest

A request to classify an image.

VNGenerateImageFeaturePrintRequest

An image-based request to generate feature prints from an image.

VNRequest

The abstract superclass for analysis requests.