Drawing 4-sided polygons around objects

Question

Mohammad Abu-Haifa 2020-10-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/629748-drawing-4-sided-polygons-around-objects

评论： Mohammad Abu-Haifa 2020-10-28

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 