[WM]:Problem in implementing DWT for watermarking

[rupal agravat <rupalagravat@yahoo.com>]

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