Are all images arrow-proof?
 
 
Deakins:
Captain, I’ve just checked the Hall of Fame, it seems that “Louvre” and “Casimir” have weaker shields that “Fall”. Before Ep2, I asked you for other images, why are they not as robust as those selected during Ep1?
 
Hale:
Well Major, it is not because the PSNR is over 30dB that the quality of the image is fine. Let me show you the the attacked Casimir at 31dB that is currently present in the Hall of Fame:
 
[NotA: Sorry you can understand that it is not possible to show the image...]
 
Deakins:
Gosh! This “Casimir” would frighten lot of children...
 
Hale:
Yes but see, in the contrary the attacked “Fall” of Ep.1 is not that bad... it even seems that the easier you remove the watermark the bigger the visual distortion!
Moreover, this difference is also related to the fact that each watermark is embedded with a constant distortion (42.5dB) and consequently that the robustness of the images fluctuates according to them.
 
Deakins:
You’re right major, I’ll try to prove using my favorite Lagrangian methods now, I have my idea on it...
 
Hale:
Lagrangian methods???  Pentagon teach me about Nuclear methods but I didn’t know that there were others...
 
 
 
Are all images arrow-proof?
Thursday, October 25, 2007