Re: [WM]:Problem in implementing DWT for watermarking

["shijun xiang" <xiangshijun@gmail.com>]

Dear Rupal Agravat,

 

Try the following code:

 

%*************************************

x = imread('camera.bmp');

imshow(x)

[A,H,V,D] = dwt2(x,'haar');

img = idwt2(A,H,V,D,'haar');

 

img1=uint8(img);

 

figure, imshow(img); 

%*************************************

On 4/15/07, rupal agravat <rupalagravat@yahoo.com> wrote:

Respected All,

Myself, Rupal Agravat, student of Master's Computer Science, implementing watermarking using different methods like, LSB, other spatial domain methods, DCT and now i m implementing using DWT. But i m facing following problem.........

I am using image of camera man 256x256 8bit per pixel. For testing purpose only i wrote following code

x = imread('camera.bmp');

imshow(x)

[A,H,V,D] = dwt2(x,'haar');

img = idwt2(A,H,V,D,'haar');

figure, imshow(img);

And it is giving white image with out any grayscale ........................ i mean i m not able to see the camera man image................

Can anybody tell me why it is happening?

In advance, i am very much thankful to the persons giving me the positive answer...........

 

-Rupal Agravat

India

-- 
Best regards.

Shijun Xiang (Ph.D)
Email: xiangshijun@gmail.com 
Tel: 82 2 3290 4764
Home Page: 
http://cist.korea.ac.kr/~xiangshijun/index.htm 
Research lecturer, Center of Information Security Center (CIST), Graduate
School of Information Security, Korea University, anam-Dong, Seongbuk-Gu, Seoul 136-713, Korea