Video Labeler App and exporting the data
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Hi there,
I have been using the App Video Labeler to track objects. So I created ROI for various features but I am having a hard time exporting this data so that I can use it outside the App. Attached is an example of a short video where I have tracked 2 things (using rectangle ROI) and I also created an horizontal line (using a ROI line) but I now want to export that data to further calculate the trajectory, maybe the angle of the line with respect to the bottom of the photo, etc... but once I export the groundTruth data using the Export Labels + to File, I don't understand how I can use the groundTruth exported labels to use elsewhere. Can I get the x,y coordinate for each object for each frame? If so how do I access that? Can I get the line equation?
Anyway I have been searching the help but I find it very basic and can not make sense of all this. Does anyone have concret examples to share? Does anyone have any useful tutorial? I also tried with pixel labeler using Video Labeler and I was able to generate a movie of the pixel label but unable to extract separately each object from the movie.
Attached is an example of a movie with the exported data from the Video Labeler App. At this point anything would help! Thank you.
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Answers (1)
Harsha Priya Daggubati
on 19 Jun 2020
Hi,
I can answer a part of your question, to my understanding you can get the 'position' of the object labelled by bounding boxes from 'gTruth' in MATLAB Workspace as follows:
You might know, that ground truth exported to MATLAB Workspace from Video Labeler App, is a structure with 3 fields: DataSource, Label Definitions, Label Data. You can get the position of every bounding box using Label Data field. You can work as follows:
labelData = gTruth.labelData;
head(labelData)
gTruthInterval(1,:).Car{1}.Position % [x y width height], in pixels
The code above helps you get x, y coordinates of an object.
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