verify which one is the correct one to calculate

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bay rem
bay rem le 3 Fév 2016
Commenté : Walter Roberson le 3 Fév 2016
i tried both of those instruction to calculate variance of each blob in one image, both leads to different results, i dont know wich one is the correct one can you please help me
for i=1: numofblobs
croppedImage = frameRGB(bbox(i, 2):bbox(i, 2)+bbox(i, 4)-1, bbox(i, 1):bbox(i, 1)+bbox(i, 3)-1, :);
blobVariance(i) = var(double(croppedImage(:)));
end
OR
for i=1: numofblobs
blobVariance(i) = var(double(bbox(i,:)))
end
where
bbox = step(blobAnalysis, binaryimage);

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Walter Roberson
Walter Roberson le 3 Fév 2016
We would need to see the configuration of your blobanalysis to be sure, but the second code appears to be finding the variance in the coordinates of bounding boxes but the first one appears to be looking at the variance in the content of the images inside the bounding boxes
  2 commentaires
bay rem
bay rem le 3 Fév 2016
Modifié(e) : bay rem le 3 Fév 2016
thank you Here there is the configuration of blobAnalysis
blobAnalysis = vision.BlobAnalysis('BoundingBoxOutputPort', true, ...
'AreaOutputPort', false, 'CentroidOutputPort', false, ...
'MinimumBlobArea', 1700,'MaximumCount',2);
i really need help :(
Walter Roberson
Walter Roberson le 3 Fév 2016
Your second code would only find the variance in the coordinates, not in the content. You want the first code.

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