How can I create a binary image with a rectangle inscribe? I am trying to modify this code for that

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Kelechukwu Ezike 2018-2-12

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https://ww2.mathworks.cn/matlabcentral/answers/382263-how-can-i-create-a-binary-image-with-a-rectangle-inscribe-i-am-trying-to-modify-this-code-for-that

编辑： Kelechukwu Ezike 2018-2-12

[Length, Width] = size(imagen);
r = 0.3
B = zeros(Length, Width);
for i = 1:Width % top to bottom
for j = 1:Length %left to right
H =sqrt((i - 0.5*Width)^2 + (j - 0.5*Width)^2);
% Defines a Circle ^
if(H<=r*Width);
B(i,j)=Length;
else
B(i,j)= 0;
end
end
end
figure(6)
imshow(B);
Im_B1 = double(imagen).*(B);
figure()
imshow(Im_B1)