How to load data from Video Labelled Sessions?

I am trying to create yolo_v2 object detection model. For this I have .mp4 video file which is labeled using MATLAB Video Labeller. The labelled data is stored as groundTruth in MATLAB workspace.

The Structure of the ground_truth

TIME PEN BLUE_PEN AC_REMOTE

%labels is the original groundTruth variable  
 video_bbox = labels.LabelData;
 rng(0);
 shuffledIndices = randperm(height(video_bbox));
 idx = floor(0.8 * length(shuffledIndices) );

 trainingIdx = 1:idx;
 trainingDataTbl = video_bbox(shuffledIndices(trainingIdx),:);

 validationIdx = idx+1 : idx + 1 + floor(0.1 * length(shuffledIndices) );
 validationDataTbl = video_bbox(shuffledIndices(validationIdx),:);
 
 imdsTrain = imageDatastore(trainingDataTbl{:,'Time'});
 bldsTrain = boxLabelDatastore(trainingDataTbl(:,{'Pen','Blue_Pen','AC_Remote'}));

 imdsValidation = imageDatastore(validationDataTbl{:,'Time'});
 bldsValidation = boxLabelDatastore(validationDataTbl(:,{'Pen','Blue_Pen','AC_Remote'}));

 trainingData = combine(imdsTrain,bldsTrain);
 validationData = combine(imdsValidation,bldsValidation);
 
 %error
 Error using yolo (line 11)
Unrecognized table variable name 'Time'.

Answer 1

[Rishik Ramena]

LabelData is a timetable which is different than a regular table. If you need to access the time column as well you might want to consider using timetable2table. You can also access the Time column from timetables using a dot notation as mentioned here.

TLDR: convert the timetable to table as shown below and this should work.

video_bbox = timetable2table(labels.LabelData); %convert timetable to table