ROS Gazebo vision.BlobAnalysis Error

Hi all,

I am facing the problem with the vision.BlobAnalysis class for ROS beginner tutorial.

https://www.mathworks.com/matlabcentral/fileexchange/64534-getting-started-with-robot-operating-system-ros

Following is the error:

Array formation and parentheses-style indexing with
objects of class 'vision.BlobAnalysis' is not allowed.
Use objects of class 'vision.BlobAnalysis' only as
scalars or use a cell array.

Error in detectCircle (line 37)
    [centroids,majorAxes] = detector(imgBW);

Error in gazeboExampleMATLAB (line 29)
    [centerX,centerY,circleSize] =
    detectCircle(img,resizeScale);

please suggest, how can I resolve the error. Thank you very much in advance.

Answer 1

[Sebastian Castro]

Are you trying this in a version earlier than R2016b, by any chance?

If so, replace the problematic line with:

[centroids,majorAxes] = step(detector,imgBW);

- Sebastian

Answer 2

[Ravindra]

Thank you very much Sebastian!! Works perfectly.