Drawing 4-sided polygons around objects

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Hello
I wrote a code to approximate each brick in this image into rectangles. However, some bricks in other images can't be approximated into rectangles due to the irregular shape
So, I need to draw a 4-sided polygon around each brick. Can any one help me?
Here is the rectangle's code:
clc; clear; close;
I = imread ('1.png');
figure, imshow(I);
IBW = imbinarize(rgb2gray(I));
[L, num ] = bwlabel(IBW);
bboxes = regionprops(L, 'BoundingBox');
figure, imshow(IBW);
hold on
for k=1 : length(bboxes)
curbb = bboxes(k). BoundingBox;
rectangle ('Position',[curbb(1),curbb(2),curbb(3),curbb(4)], 'EdgeColor','g', 'LineWidth', 1)
end
hold off

Answers (1)

Matt J
Matt J on 28 Oct 2020
This will help to find the corners of the boxes.
Use the line() command instead of rectangle() to draw general quadrilaterals.
  2 Comments
Mohammad Abu-Haifa
Mohammad Abu-Haifa on 28 Oct 2020
There is an error appers (Unrecognized function or variable 'pgonCorners').
Mohammad Abu-Haifa
Mohammad Abu-Haifa on 28 Oct 2020
can you please write the final code based on the information presented in my code in the question?

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