getTrackFilterProperties

Obtain filter properties of track from multi-object tracker

Syntax

values = getTrackFilterProperties(tracker,trackID,property)

values = getTrackFilterProperties(tracker,trackID,property1,...,propertyN)

Description

values = getTrackFilterProperties(tracker,trackID,property) returns the tracking filter property values for a specific track within a multi-object tracker. trackID is the ID of that specific track.

values = getTrackFilterProperties(tracker,trackID,property1,...,propertyN) returns multiple property values. You can specify the properties in any order.

Examples

Display and Set Tracking Filter Properties in Multi-Object Tracker

Create a multiObjectTracker System object™ using a constant-acceleration, linear Kalman filter for all tracks.

tracker = multiObjectTracker('FilterInitializationFcn',@initcakf, ...
    'ConfirmationParameters',[4 5],'DeletionThreshold',[9 9]);

Create two detections and generate tracks for these detections.

detection1 = objectDetection(1.0,[10; 10]);
detection2 = objectDetection(1.0,[1000; 1000]);
[~,tracks] = tracker([detection1 detection2],1.1)

tracks=2×1 object
  2x1 objectTrack array with properties:

    TrackID
    BranchID
    SourceIndex
    UpdateTime
    Age
    State
    StateCovariance
    StateParameters
    ObjectClassID
    TrackLogic
    TrackLogicState
    IsConfirmed
    IsCoasted
    IsSelfReported
    ObjectAttributes

Get filter property values for the first track. Display the process noise values.

values = getTrackFilterProperties(tracker,1,'MeasurementNoise','ProcessNoise','MotionModel');
values{2}

ans = 2×2

     1     0
     0     1

Set new values for this property by doubling the process noise for the first track. Display the updated process noise values.

setTrackFilterProperties(tracker,1,'ProcessNoise',2*values{2});
values = getTrackFilterProperties(tracker,1,'ProcessNoise');
values{1}

ans = 2×2

     2     0
     0     2

Input Arguments

tracker — Multi-object tracker

multiObjectTracker System object™

Multi-object tracker, specified as a multiObjectTracker System object.

trackID — Track ID

positive integer

Track ID, specified as a positive integer. trackID must be a valid track in tracker.

property — Tracking filter property

character vector | string scalar

Tracking filter property to return values for, specified as a character vector or string scalar. property must be a valid property of the tracking filter used by tracker. Valid tracking filters are trackingKF, trackingEKF, and trackingUKF.

You can specify additional properties in any order.

Example: 'MeasurementNoise','ProcessNoise'

Data Types: char | string

Output Arguments

values — Tracking filter property values

cell array

Tracking filter property values, returned as a cell array. Each element in the cell array corresponds to the values of a specified property. getTrackFilterProperties returns the values in the same order in which you specified the corresponding properties.

Version History

Introduced in R2017a