currentTrackMetrics
Metrics for recent tracks
Description
returns a table of metrics, metricsTable
= currentTrackMetrics(errorMetrics
)metricsTable
, for every track identifier
provided in the most recent update.
Examples
Assignment and Error Metrics for Two Tracked Targets
Examine the assignments and errors for a system tracking two targets.
First, load the stored track data.
load trackmetricex tracklog truthlog
Create objects to analyze assignment and error metrics.
tam = trackAssignmentMetrics; tem = trackErrorMetrics;
Create the output variables.
posRMSE = zeros(numel(tracklog),1); velRMSE = zeros(numel(tracklog),1); posANEES = zeros(numel(tracklog),1); velANEES = zeros(numel(tracklog),1);
Loop over all tracks to:
Extract the tracks and ground truth at the i th tracker update.
Analyze and retrieve the current track-to-truth assignment.
Analyze instantaneous error metrics over all tracks and truths.
for i=1:numel(tracklog) tracks = tracklog{i}; truths = truthlog{i}; [trackAM,truthAM] = tam(tracks, truths); [trackIDs,truthIDs] = currentAssignment(tam); [posRMSE(i),velRMSE(i),posANEES(i),velANEES(i)] = ... tem(tracks,trackIDs,truths,truthIDs); end
Show the track metrics table.
trackMetricsTable(tam)
ans=4×16 table
TrackID AssignedTruthID Surviving TotalLength UnreportedStatus DeletionStatus DeletionLength DivergenceStatus DivergenceCount DivergenceLength RedundancyStatus RedundancyCount RedundancyLength FalseTrackStatus FalseTrackLength SwapCount
_______ _______________ _________ ___________ ________________ ______________ ______________ ________________ _______________ ________________ ________________ _______________ ________________ ________________ ________________ _________
1 NaN false 1120 false false 0 false 3 3 false 0 0 false 0 0
2 NaN false 1736 false false 0 false 8 88 false 0 0 false 28 3
6 3 true 1138 false false 0 false 4 314 false 1 28 false 0 2
8 2 true 662 false false 0 false 2 29 false 1 169 false 28 0
Show the truth metrics table.
truthMetricsTable(tam)
ans=2×11 table
TruthID AssociatedTrackID DeletionStatus TotalLength UnreportedStatus BreakStatus BreakCount BreakLength InCoverageArea EstablishmentStatus EstablishmentLength
_______ _________________ ______________ ___________ ________________ ___________ __________ ___________ ______________ ___________________ ___________________
2 8 false 2678 false false 4 168 true true 56
3 6 false 2678 false false 3 645 true true 84
Plot the RMSE and ANEES error metrics.
subplot(2,2,1) plot(posRMSE) title('Position Error') xlabel('tracker update') ylabel('RMSE (m)') subplot(2,2,2) plot(velRMSE) title('Velocity Error') xlabel('tracker update') ylabel('RMSE (m/s)') subplot(2,2,3) plot(posANEES) title('Position Error') xlabel('tracker update') ylabel('ANEES') subplot(2,2,4) plot(velANEES) title('Velocity Error') xlabel('tracker update') ylabel('ANEES')
Show the current error metrics for each individual recorded track.
currentTrackMetrics(tem)
ans=2×5 table
TrackID posRMS velRMS posANEES velANEES
_______ ______ ______ ________ ________
6 44.712 20.988 0.05974 0.31325
8 129.26 12.739 1.6745 0.2453
Show the current error metrics for each individual recorded truth object.
currentTruthMetrics(tem)
ans=2×5 table
TruthID posRMS velRMS posANEES velANEES
_______ ______ ______ ________ ________
2 129.26 12.739 1.6745 0.2453
3 44.712 20.988 0.05974 0.31325
Show the cumulative error metrics for each individual recorded track.
cumulativeTrackMetrics(tem)
ans=4×5 table
TrackID posRMS velRMS posANEES velANEES
_______ ______ ______ ________ ________
1 117.69 43.951 0.58338 0.44127
2 129.7 42.8 0.81094 0.42509
6 371.35 87.083 4.5208 1.6952
8 130.45 53.914 1.0448 0.44813
Show the cumulative error metrics for each individual recorded truth object.
cumulativeTruthMetrics(tem)
ans=2×5 table
TruthID posRMS velRMS posANEES velANEES
_______ ______ ______ ________ ________
2 258.21 65.078 2.2514 0.93359
3 134.41 48.253 0.96314 0.49183
Input Arguments
errorMetrics
— Error metrics object
trackErrorMetrics
System object
Error metrics object, specified as a trackErrorMetrics
System object™.
Output Arguments
metricsTable
— Track error metrics
table
Track error metrics, returned as a table:
When you set the
ErrorFunctionFormat
property of the input error metrics object to'built-in'
, the table columns depend on the setting of theMotionModel
property.Motion Model Table Columns 'constvel'
posRMSE
,velRMSE
,posANEES
,velANEES
'constacc'
posRMSE
,velRMSE
,accRMSE
,posANEES
,velANEES
,accANEES
'constturn'
posRMSE
,velRMSE
,yawRateRMSE
,posANEES
,velANEES
,yawRateANEES
RMSE and ANEES denote root mean squared error and average normalized estimation error squared of a track at the current time step. For example, the position RMSE and ANEES values for a track are defined respectively as:
where ptrack, i is the position of track i, ptruth, i is the position of the truth associated to track i, and Ci is the position covariance of track i at the current time step. Note that the RMSE and ANEES values are only calculated for one time step using the
currentTrackMetrics
. The RMSE and ANEES values for other states (vel
,pos
,acc
, andyawRate
) are defined similarly.When you set the
ErrorFunctionFormat
property to'custom'
, the table contains the arithmetically averaged values of the custom metrics output from the error function.
Version History
Introduced in R2018b
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