Image rectangle using matrix - antialiasing

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Giuseppe
Giuseppe 2013-11-18
评论： Giuseppe 2013-11-20
Hi, I'm trying to write a script that draws a rectangle from an array. It remains to solve the problem mainly on the edge antialiasing. Can someone help me? thanks
function linea
Nx = 64;
Ny = 64;
x0 = 32;
y0 = 32;
l = 30;
h = 5;
for theta = 0:0.5:360.5
im = ones(Nx,Ny);
theta = theta * pi / 180;
for i = -l/2:l/2
for j = -h/2:h/2
x = x0 + i * cos(theta) + j * sin(theta);
y = y0 - i * sin(theta) + j * cos(theta);
im(round(x),round(y)) = 0;
end
end
imagesc(im,[0 1]);
axis image
colormap gray
drawnow
end
end

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Image Analyst
Image Analyst 2013-11-18
You can blur im with conv2() to smooth out edges. But a bigger problem is the way you send 0's to your output image. Doing that will give you "holes" where no pixel got set. You need to invert that and scan your output array and figure out what 4 pixels in the input it should come from. If you do that you'll not only eliminate holes, but also have smooth edges because you'll be doing bilinear interpolation.
  1 个评论
Giuseppe
Giuseppe 2013-11-20
Thanks for the reply ... Could you help me to implemtare the construction of the rectangle?

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