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From: Anuradha Kumari on 12 Jun 2010 13:01
Hi ,
I've a project on digital watermarking using fractional fourier transform
m nt able to get through it.i have written the code but after watermarking iam not getting the original image.here's my code
A = imread('cameraman.tif');
T = dFRT(256,0.1);
F = T*double(A)*T;
figure,imshow(mat2gray(log(1+abs(F))));
P= imread('monogram.jpg');
R= rgb2gray(P);
T1 = dFRT(90,0.1);
F1=T1*double(R)*T1;
figure,imshow(mat2gray(log(1+abs(F1))));
for i=90:180
for j=90:180
if(((i-89)<90)&&(j-89)<90)
F(i,j)= F1(i-89,j-89);
end
end
end
figure,imshow(mat2gray(log(1+abs(F))));
T2=dFRT(256,-0.1);
F4 = T2*double(F)*T2;
figure,imshow(mat2gray(log(1+abs(F))))
plz help me wid it
Thanks
From: ImageAnalyst on 12 Jun 2010 13:26
What toolbox is dFRT in?
From: Anuradha Kumari on 12 Jun 2010 14:06
ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message <bd5cccac-5651-4680-af86-64053eb4daa8(a)y11g2000yqm.googlegroups.com>...
> What toolbox is dFRT in?
dFRT isnt present in any toolbox but it is an inbuilt function in matlab to find the fractional fourier transform of an image by passing parameters like size of the image and the order of fractional fourier transform
From: Greg Heath on 12 Jun 2010 17:41
On Jun 12, 2:06 pm, "Anuradha Kumari" <anuradhakaam...(a)yahoo.co.in>
wrote:
> ImageAnalyst <imageanal...(a)mailinator.com> wrote in message <bd5cccac-5651-4680-af86-64053eb4d...(a)y11g2000yqm.googlegroups.com>...
> > What toolbox is dFRT in?
>
> dFRT isnt present in any toolbox but it is an inbuilt function in matlab to find the fractional fourier  transform of an image by passing parameters like size of the image and the order of fractional fourier transform

I cannot find the documentation on the mathworks website.

Can you provide the URL for the documentation and/or
cut and paste the result of typing the command

help dfrt

Thanks,

Greg
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