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    IVALab Python Libraries
    
   Collection of code for computer vision and robotics with specific API. 
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The pilot study consists of ROS bags, with one per participant. Each participant had to perform the placement task several times. All tasks per participant are recording in a single ROS bag, from which the breaks must be determined.
This is what I forgot how to do. There is a python script calibrate_firstframe_bycolor that appears to do some of the work based on the first frame from the ROS bag. First it recovers the black mat, then asks for user input to get the puzzle piece regions.