using vision.BlobAnalysis to create BLOBs ,

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for detecting motion, i used vision.BlobAnalysis to create BLOBs... and then i wanna know how to extract geometric attribute from each blob : MAJORAXIS, MINORAXIS, ORIENTATION? anyone can help me please

Accepted Answer

Walter Roberson
Walter Roberson on 14 Sep 2015
Use regionprops() from the Image Processing Toolbox

More Answers (1)

Dima Lisin
Dima Lisin on 15 Sep 2015
To do that you have to configure the vision.BlobAnalysis object to give you those outputs:
blobAnalyzer = vision.BlobAnalysis('MajorAxisLengthOutputPort', true, ...
'MinorAxisLengthOutputPort', true, 'OrientationOutputPort', true);
Now if you call the step method you will get all those outputs:
[area, centroid, bbox, major, minor, orientation] = step(blobAnalyzer, I);
You can also turn the area, centroid, and bbox outputs off if you don't need them.
Dima Lisin
Dima Lisin on 13 Nov 2015
Can you post how you create the vision.BlobAnalysis object, and how you call the step() method?

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