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Swirl effect in MATLAB

After reading a couple of image processing books, I tried to implement some Photoshop effects in MATLAB.  First, I tried to implement the twirl effect in MATLAB.


The mid point of the image is stored in the variables ‘midx’ and ‘midy’.
The angle and the radius for each point in the image are found by converting the co-ordinates from Cartesian to polar co-ordinates. 

 The effect can be obtained by using the following formula: 
new[rho , theta] = old[rho , theta + rho /K] .

By changing the value of K, the swirl can be increased or decreased.


For more fun, try this effect with your own photography image.

Additional Information: Learn to make your own Photoshop effects so that you can code your own effects.

For beginners in photoshop: Read photoshop for dummies .





MATLAB CODE:


A=imread('flower2.jpg');

B=uint8(zeros(size(A)));
figure,imshow(A);

%Mid point of the image
midx=ceil((size(A,1)+1)/2);
midy=ceil((size(A,2)+1)/2);
K=150
K=100;
x2=zeros([size(A,1) size(A,2)]);
y2=zeros([size(A,1) size(A,2)]);
for i=1:size(A,1)
    x=i-midx-K;
    for j=1:size(A,2)
%Cartesian to Polar co-ordinates
           [theta1,rho1]=cart2pol(x,j-midy+K);
     
       
               
        phi=theta1+(rho1/K);
       
%Polar to Cartesian co-ordinates
        [l,m]=pol2cart(phi,rho1);
        x2(i,j)=ceil(l)+midx;
        y2(i,j)=ceil(m)+midy;
       
    end
end
          
  %The result may produce value lesser than 1 or greater than the image size.


x2=max(x2,1);
x2=min(x2,size(A,1));

y2=max(y2,1);
y2=min(y2,size(A,2));
        
       
        for i=1:size(A,1)
            for j=1:size(A,2)
                B(i,j,:)=A(x2(i,j),y2(i,j),:);
            end
        end
       
     figure,   imshow(B);
K=100







     Reference:


FOR FUN:  Create your own Photoshop effects
like button Like "IMAGE PROCESSING" page

4 comments:

Movies Gallery 2011 said... Reply to comment

Excellent pieces. Keep posting such kind of information on your blog. I really impressed by your blog.
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Chintan Patel said... Reply to comment

How to implement different color tint on image using matlab?

Chintan Patel said... Reply to comment

how can we implement different color tint on iimage using matlab?

abc said... Reply to comment

its really good but pretty confusing so can u plz explain a bit more about the code ans how u have implemented it.

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