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using vision.BlobAnalysis to create BLOBs ,

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si sam
si sam el 14 de Sept. de 2015
Comentada: Dima Lisin el 13 de Nov. de 2015
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

Respuesta aceptada

Walter Roberson
Walter Roberson el 14 de Sept. de 2015
Use regionprops() from the Image Processing Toolbox

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Dima Lisin
Dima Lisin el 15 de Sept. de 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.
  2 comentarios
syhem samti
syhem samti el 13 de Nov. de 2015
here the message error: " Error using vision.BlobAnalysis/step Too many output arguments; 6 output(s) requested but only 2 output(s) available."
Dima Lisin
Dima Lisin el 13 de Nov. de 2015
Can you post how you create the vision.BlobAnalysis object, and how you call the step() method?

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