I want to count the number of metric elements in if statement using 'sum', but it shown all the content of elements, not the number. I'm new.. pls help..

here the code

stats = regionprops(L,'Area','Centroid', 'BoundingBox');

threshold = 0.88;

for k = 1:length(B)

boundary = B{k};

delta_sq = diff(boundary).^2;
perimeter = sum(sqrt(sum(delta_sq,2)));

area = stats(k).Area;

metric = 4*pi*area/perimeter^2;

metric_string = sprintf('%2.2f',metric);

if metric >= threshold 
  centroid = stats(k).Centroid;
  plot(centroid(1),centroid(2),'ko');
  as = sum(metric);
end  

end

Answer 1

[Image Analyst]

Way too clumsy. Try something like this (untested):

stats = regionprops(L,'Area','Centroid', 'Perimeter');
allAreas = [stats.Area];
allPerimeters = [stats.Perimeter];
circularities = (4*pi*allAreas) ./ allPerimeters.^2; % Inverted compared to how I use it.
threshold = 0.88;
roundObjects = circularities > threshold;
as = sum(circularities(roundObjects));

[setiawandika]

it works. thanks a lot.