illusion using matlab codes

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

%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/

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