I wana use key in this code butt how??

load sculpture
imagesc(X)
colormap gray
[LoD,HiD] = wfilters('haar','d');
[cA,cH,cV,cD] = dwt2(X,LoD,HiD,'mode','symh'); subplot(2,2,1)
imagesc(cA)
colormap gray
title('Approximation')
subplot(2,2,2)
imagesc(cH)
colormap gray
title('Horizontal')
subplot(2,2,3)
imagesc(cV)
colormap gray
title('Vertical')
subplot(2,2,4)
imagesc(cD)
colormap gray
title('Diagonal')

[Jan]

Which "keys"?

[Sultan Mehmood]

To make secure. How DWT works with keys.?

[Walter Roberson]

To make what secure?

Note: depending upon your answer, there is a possibility that we may need to close the Question. The law of the United States do not permit Mathworks to host discussions of encryption techniques.

[Sultan Mehmood]

I want to encrypt image by DWT and I want to use key in DWT. as above code if i want to use key then how am used in that code. Kindly help

[Jan]

@Sultan Mehmood: The question is not specific enough to get answered. "Using key in DWT" could mean a variety of things and the readers cannot guess, what you need. I suggest to ask an internet search engine for "image encryption" at first.

[Sultan Mehmood]

Apply DWT defined parameter k(t) to the image and obtain cV,cH,cV,cD.

Answer 1

[Sultan Mehmood]

How key works

[Rik]

please don't post comments in the answer field