Class

VNTrackObjectRequest

An image analysis request that tracks movement of a previously identified arbitrary object across multiple images or video frames.

Declaration

class VNTrackObjectRequest : VNTrackingRequest

Overview

Use this type of request to track the bounding boxes around objects previously identified in an image. Vision will attempt to locate the same object from the input observation throughout the sequence.

Topics

Initializing an Object Tracking Request

init(detectedObjectObservation: VNDetectedObjectObservation)

Creates a new object tracking request with a detected object observation.

init(detectedObjectObservation: VNDetectedObjectObservation, completionHandler: VNRequestCompletionHandler?)

Creates a new object tracking request with a detected object observation.

Specifying a Revision

let VNTrackObjectRequestRevision2: Int

Beta
let VNTrackObjectRequestRevision1: Int

A constant for specifying revision 1 of VNTrackObjectRequest.

Relationships

Inherits From

Conforms To

See Also

Object Tracking

Tracking the User’s Face in Real Time

Detect and track faces from the selfie cam feed in real time.

Tracking Multiple Objects or Rectangles in Video

Apply Vision algorithms to track objects or rectangles throughout a video.

class VNTrackingRequest

The abstract superclass for image analysis requests that track unique features across multiple images or video frames.

class VNTrackRectangleRequest

An image analysis request that tracks movement of a previously identified rectangular object across multiple images or video frames.

class VNDetectedObjectObservation

An image analysis result that provides the position and extent of a detected image feature.

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