Vision · IOS API REFERENCE

DetectedObjectObservation

struct · iOS 18.0+ · SDK 27.1

struct DetectedObjectObservation

An observation that provides the position and extent of an image feature that an image analysis request detects. This class is the observation type that ``TrackObjectRequest`` generates. It represents an object that the Vision request detects and tracks.

Members (9)

get · iOS 18.0+

confidence

TypeScript

get confidence(): number

Swift declaration

let confidence: Float

The level of confidence normalized to `[0, 1]` where `1` is most confident. The only exception is results coming from `CoreMLRequest`, where confidence values are forwarded as is from relevant CoreML models

get · iOS 18.0+

boundingBox

TypeScript

get boundingBox(): NormalizedRect

Swift declaration

var boundingBox: NormalizedRect

The bounding box of the object. The coordinate system is normalized to the dimensions of the processed image, with the origin at the lower-left corner of the image.

set · iOS 18.0+

boundingBox

TypeScript

set boundingBox(value: NormalizedRect)

Swift declaration

var boundingBox: NormalizedRect

The bounding box of the object. The coordinate system is normalized to the dimensions of the processed image, with the origin at the lower-left corner of the image.

init · iOS 18.0+

init

TypeScript

static initBoundingBox(boundingBox: NormalizedRect): DetectedObjectObservation

Swift declaration

init(boundingBox: NormalizedRect)

get · iOS 18.0+

description

TypeScript

get description(): string

Swift declaration

var description: String { get }

A textual representation of this instance. Calling this property directly is discouraged. Instead, convert an instance of any type to a string by using the `String(describing:)` initializer. This initializer works with any type, and uses the custom `description` property for types that conform to `CustomStringConvertible`: struct Point: CustomStringConvertible { let x: Int, y: Int var description: String { return "(\(x), \(y))" } } let p = Point(x: 21, y: 30) let s = String(describing: p) print(s) // Prints "(21, 30)" The conversion of `p` to a string in the assignment to `s` uses the `Point` type's `description` property.

get · iOS 18.0+

originatingRequestDescriptor

TypeScript

get originatingRequestDescriptor(): (RequestDescriptor) | null

Swift declaration

let originatingRequestDescriptor: RequestDescriptor?

The descriptor of the request that produced the observation.

get · iOS 18.0+

uuid

TypeScript

get uuid(): string

Swift declaration

let uuid: UUID

The unique identifier for the observation.

get · iOS 18.0+

timeRange

TypeScript

get timeRange(): (_CoreMedia_CMTimeRange) | null

Swift declaration

let timeRange: CMTimeRange?

The time range of the reported observation. When evaluating a sequence of image buffers, use this property to determine each observation’s start time and duration.

init · iOS 18.0+

init

TypeScript

static init(observation: VNDetectedObjectObservation): DetectedObjectObservation

Swift declaration

init(_ observation: VNDetectedObjectObservation)

Skipped declarations

No declarations were skipped in this snapshot.

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