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
Kelechukwu Ezike 2018-2-12
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)

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