Path: news.mathworks.com!not-for-mail
From: "ABUTALA " <love.scream1@gmail.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: I need to help?
Date: Fri, 19 Sep 2008 17:04:04 +0000 (UTC)
Organization: The MathWorks, Inc.
Lines: 24
Message-ID: <gb0m24$9a8$1@fred.mathworks.com>
References: <gb0kj5$ov3$1@fred.mathworks.com> <e7ea5034-2104-4ba0-8820-104944d5d5a3@f36g2000hsa.googlegroups.com>
Reply-To: "ABUTALA " <love.scream1@gmail.com>
NNTP-Posting-Host: webapp-05-blr.mathworks.com
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 8bit
X-Trace: fred.mathworks.com 1221843844 9544 172.30.248.35 (19 Sep 2008 17:04:04 GMT)
X-Complaints-To: news@mathworks.com
NNTP-Posting-Date: Fri, 19 Sep 2008 17:04:04 +0000 (UTC)
X-Newsreader: MATLAB Central Newsreader 1482948
Xref: news.mathworks.com comp.soft-sys.matlab:490998



> "love":
> I didn't need to run it - I can tell just from reading the code.
> Basically it blends two images together and asks you to give a
> subjective rating on the "robustness" (whatever that is) of the
> watermark.  You'd need to define "robustness" better and then, after
> you've plotted robustness vs. blending percentage, make some kind of
> subjective call about which blending factor is "best."  This is a very
> simple to construct and very visible type of watermark.  It's not
> really steganography because it's not hidden.  There are so many ways
> to hide one image in another that can't be detected as easily as your
> method and can only be found with knowledge of how it was
> constructed.  You could think up your own with a little thought, but
> this blending method is not a very effective one.
> You're welcome.
> Did I win?
> Regards,
> ImageAnalyst

Thank ImageAnalyst 

I want to know the quality between images by PSNR(A,B)?

THANKS