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" Two roads diverged in a wood, and I,
I took the one less traveled by,
And that has made all the difference "-Robert Frost

I can't sleep Illusion


In this illusion, I used slanted lines in two different directions  to highlight the foreground from the background.

First, the background is formed with slanting lines in one direction.

Steps to form background with slanting lines:
1.       Get the size of the foreground image. For instance, MXN =5X8
2.       Initialize a matrix of size 1XN=1X8.
3.       Generate values for the matrix.
Eg. [10  10 250 250 10 10 250 250]ie [BBWWBBWW] B-Black, W-White
4.       Initialize another matrix of size MXN. In the first row copy the random values.
5.       For the second row perform circshift. By circshift the pixel at the first column will be moved to the last column and the remaining pixels are shifted to left by one.Eg [10 250 250 10 10 250 250 10].
      Now the colors will be [BWWBBWWB].
6.       Continue to perform circshift  for all the rows.  Now the slanting lines are formed.
   10    10   250   250    10    10   250   250
   10   250   250    10    10   250   250    10
   250   250    10    10   250   250    10    10
   250    10    10   250   250    10    10   250
    10    10   250   250    10    10   250   250


MATLAB CODE:
%Read the Image
TImg=imread('sleep.jpg');

m=size(TImg,1);
n=size(TImg,2);

if(mod(n,2)~=0)
    n=n-mod(n,2);
end   
if(mod(n,4)~=0)
        n=n-mod(n,4);
end
BImg=uint8(zeros([1 n 3]));
flag=0;
%Values for first column (bbwwbbwwbbww)
for i=1:2:n
    if(flag==1)
            BImg(1,i:i+1,:)=10;
            flag=0;
    else
            BImg(1,i:i+1,:)=240;
            flag=1;
    end
end
%Initialization
A=uint8(zeros([m size(BImg,2) 3]));
Arot=uint8(zeros([m size(BImg,2) 3]));
SImg=uint8(zeros([m size(BImg,2) 3]));
FImg=uint8(zeros([m size(BImg,2) 3]));
A(1,:,:)=BImg(1,:,:);

%Slanting lines
for i=2:m
    BImg=circshift(BImg,[1,-1]);
    A(i,:,:)=BImg(1,:,:);
end



Steps to perform on foreground Image:
1.       Rotate the background image from left to right.
2.       Convert the foreground image into binary image and negate it. Then perform image multiplication with the rotated background image.

MATLAB CODE:
%Flip the image from left to right
Arot(:,:,1)=fliplr(A(:,:,1));
Arot(:,:,2)=fliplr(A(:,:,2));
Arot(:,:,3)=fliplr(A(:,:,3));
%Foreground
BImg=uint8(~im2bw(TImg));
BImg=imresize(BImg,[size(Arot,1) size(Arot,2)]);
SImg(:,:,1)=BImg.*Arot(:,:,1);
SImg(:,:,2)=BImg.*Arot(:,:,2);
SImg(:,:,3)=BImg.*Arot(:,:,3);
SImg(SImg==0)=1;

Image Mask:
1.       Multiply the background image with the binary foreground image to obtain the mask.
MATLAB CODE:
%Background Image mask
BImg1=uint8(im2bw(TImg));
BImg1=imresize(BImg1,[size(Arot,1) size(Arot,2)]);
FImg(:,:,1)=BImg1.*A(:,:,1);
FImg(:,:,2)=BImg1.*A(:,:,2);
FImg(:,:,3)=BImg1.*A(:,:,3);
FImg(FImg==0)=1;







Combine Foreground Image and the background Image mask.

MATLAB CODE:
%Combine Background mask with foreground.
Zig=FImg.*SImg;
figure,imshow(Zig);

            




GUESS THE IMAGE: 
If you can read this then give your reactions...


I used square font to make this illusion. You can download the font at:http://fontzone.net/font-download/SF+Square+Head+Bold/

Check this link for more optical Illusion Images: Images from Blog

like button Like "IMAGE PROCESSING" page

3 comments:

siouxGER said... Reply to comment

I think this is awesome!
Could you please upload the I cant sleep one in a resolution like 1920x1080 or so? I'd LOVE to have it as my Background :D

samet said... Reply to comment

excellent work, your tutorials are very helpful thanks a lot.
ps: save the planet, go green!

Aaron Angel said... Reply to comment

@samet
Thank you!

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