count rectangular and circles

Hi all,

I want to count how many rectangular and circles in the image? what is the difference between rectagular and circle in matlab regionprops?

Also, I want to count how many rectangular and circles, both with holes in the image?

Finally, I want to export a figure just square and rectangular only.

Thank you for your help

clc;
close all;
clear;
A = imread('Shapes_with_holes.png');
A = imbinarize(A);
[label counts]= bwlabel(A);
imshow(A);
stats = regionprops(A,'Circularity','Centroid','Area','Perimeter','Solidity','FilledArea');
filledImage = imfill(A,'holes');
boundaries = bwboundaries(filledImage);
circularity = [stats.Circularity];
perimeters = [stats.Perimeter];
area = [stats.Area];
filledarea = [stats.FilledArea];
solidities = [stats.Solidity];
Centroid = [stats.Centroid];
circularities = perimeters.^2./(4*pi*filledarea);
hold on;
for blobNumber = 1 : counts
  if circularities(blobNumber) < 1.19
    theLabel = 'Circle';
  elseif circularities(blobNumber) < 1.53
    theLabel = 'Rectangle';
  else
    theLabel = 'Triangle';
  end
  text(stats(blobNumber).Centroid(1), stats(blobNumber).Centroid(2),...
    theLabel, 'Color', 'r');
end

[KALYAN ACHARJYA]

Here the Answer

[Tu Nguyen]

I read the answer, however, they use a function minboundrect that is the built-in function. Do you have any method that classify rectangular and circles ny metric value?

[DGM]

Here's another related question:

https://www.mathworks.com/matlabcentral/answers/1687304-find-figures-squares-rectangles-circles-with-matlab

Answer 1

[yanqi liu]

yes，sir，use regionpropers to find difference between rectagular and circle, may be use：

Circularity、BoundingBox

such as

bwi = imcrop(bw, round(stats(i).BoundingBox));

rate = nueml(find(bwi(:)))/numel(bwi);

now we can find rectagular get more rate than circle, may be try it.