[WM]: to anyone who can solve my problem

[Kristina Popovic <kristinapvo@yahoo.com>]

I did some watermarking based on the Tyrkel and Schyndell method using bw picture, and array with 127 elements.
 
The Matlab code is as shown below:
 
 

[s,MAP]=imread('D:\My Documents\Djordje\My Pictures\slike2\Automobil.bmp');

s=double(s);

INFO=IMFINFO('D:\My Documents\Djordje\My Pictures\slike2\Automobil.bmp');

MaxY=INFO.Width;

MaxX=INFO.Height;

L127=[0 1 1 -1 1 -1 -1 -1 1 1 -1 1 -1 1 -1 1 1 1 1 1 -1 1 1 -1 -1 1 1 -1 -1 -1 1 1 1 -1 1 1 1 1 1 -1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 1
-1 -1 -1 -1 -1 -1 -1 1 1 1 -1 1 -1 -1 -1 1 1 1 1 1 1 1 -1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 -1 -1 -1 1 -1 -1 -1 1 1 1 -1 -1 1 1
-1 -1 1 -1 -1 -1 -1 -1 1 -1 1 -1 1 -1 -1 1 1 1 -1 1 -1 -1];

X=[1:MaxY];

for I=1:MaxX

            for J=1:MaxY

                        if s(I,J)>247 s(I,J)=247; end

                        if s(I,J)<8 s(I,J)=8; end

            end

end

for I=1:1:MaxX

            s(I,X)=s(I,X)+8*L127(X);

 

end

 

imwrite(s,MAP,'D:\MyDocuments\Djordje\MyPictures\slike2AutomobilM.bmp','bmp');

>> imshow('D:\My Documents\Djordje\My Pictures\slike2\AutomobilM.bmp');

 

 

My problem is simple, I dont know how to examine basic geometric transformations, such as rotation,translation,cropping of the
watermark.As a matter of fact,I dont know the Matlab code for it!

 

If you are willing to help me please write to kristinapvo@yahoo.com

 

Sincerelly,

K.



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