Image rectangle using matrix - antialiasing

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

[Image Analyst]

http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

Answer 1

[Image Analyst]

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.

[Giuseppe]

Thanks for the reply ... Could you help me to implemtare the construction of the rectangle?