How do I fix an error when regionprops finds no blob?
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In my binary image, there is no blob/ 0 pixel /white pixel. It shows me an error.
Here is my code:
Obj = regionprops(binaryImage, gambarAsliParkir1, 'Area' , 'BoundingBox');
[~, numbersOBJECT] = bwlabel(binaryImage);
clear P1;
for i=1:numbersOBJECT
area= Obj(i).Area;
P1(i)=area; %#ok<AGROW>
end
5 Comments
Walter Roberson
on 6 Dec 2019
Your code is ambiguous in the case that the two largest blobs have exactly the same area; what do you want to do in that case?
Accepted Answer
Image Analyst
on 6 Dec 2019
Edited: Image Analyst
on 6 Dec 2019
Label it before
[labeledImage, numberOfRegions] = bwlabel(binaryImage);
props = regionprops(labeledImage, gambarAsliParkir1, 'Area' , 'BoundingBox');
allAreas = [props.Area] % Vector with list of all the areas.
pixel1 = sum(allAreas) % Sum them up
No for loop needed.
You really don't even need to call bwlabel, though it's often useful to get a labeled image if you want to do something like filtering on computer/derived measurements (like circularity), or to give unique colors to individual blobs with label2rgb() which makes it easy to determine if nearby blobs are connected or not. So you could do
props = regionprops(binaryImage, gambarAsliParkir1, 'Area' , 'BoundingBox');
allAreas = [props.Area] % Vector with list of all the areas.
pixel1 = sum(allAreas) % Sum them up
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