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From: ImageAnalyst <imageanalyst@mailinator.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: I need to help?
Date: Fri, 19 Sep 2008 10:36:11 -0700 (PDT)
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On Sep 19, 1:04=A0pm, "ABUTALA " <love.scre...@gmail.com> wrote:
> > "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. =A0You'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." =A0This is a ver=
y
> > simple to construct and very visible type of watermark. =A0It's not
> > really steganography because it's not hidden. =A0There 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. =A0You 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- Hide quoted text -
>
> - Show quoted text -

------------------------------------------------------------------------
ABUTALA:
MATLAB has a defnition of PSNR at
http://www.mathworks.com/access/helpdesk/help/toolbox/vipblks/ref/psnr.html
So you're going to plot psnr vs. human_visual_grade?
By the way, is this related to love's question or is this some
completely separate question?  How are you related to love?
Regards,
ImageAnalyst