Path: news.mathworks.com!newsfeed-00.mathworks.com!nlpi057.nbdc.sbc.com!prodigy.net!news.glorb.com!postnews.google.com!a23g2000hsc.googlegroups.com!not-for-mail
From: ImageAnalyst <imageanalyst@mailinator.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Modulation Transfer function
Date: Fri, 16 May 2008 03:59:54 -0700 (PDT)
Organization: http://groups.google.com
Lines: 54
Message-ID: <2dfe8aae-a9dd-42c2-82e5-b1cad53b0727@a23g2000hsc.googlegroups.com>
References: <g00eg4$3lp$1@fred.mathworks.com> <3b7b0902-e3f0-46ba-9e77-45190e6be339@b1g2000hsg.googlegroups.com> 
NNTP-Posting-Host: 75.186.67.199
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
X-Trace: posting.google.com 1210935594 26901 127.0.0.1 (16 May 2008 10:59:54 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Fri, 16 May 2008 10:59:54 +0000 (UTC)
Complaints-To: groups-abuse@google.com
Injection-Info: a23g2000hsc.googlegroups.com; posting-host=75.186.67.199; 
User-Agent: G2/1.0
X-HTTP-UserAgent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 
Xref: news.mathworks.com comp.soft-sys.matlab:468811


On May 15, 10:49=A0pm, "Ahmed Zaki" <azak...@gmail.com> wrote:
> ImageAnalyst <imageanal...@mailinator.com> wrote in message
>
> <3b7b0902-e3f0-46ba-9e77-
> 45190e6be...@b1g2000hsg.googlegroups.com>...
>
>
>
>
>
> > On May 8, 10:56=3DA0pm, "Ahmed Zaki" <azak...@gmail.com>
> wrote:
> > > How can I calculate the Modulation Transfer function
> for an
> > > image? Thanks.. AZ
>
> > ----------------------------------------------------------
> --------------
> > AZ:
> > You either need the point spread function (and then you
> just take the
> > magnitude of the Fourier tranform of the PSF), or you
> need an image
> > with a bunch of cycles (e.g. sine waves or black and
> white line pairs
> > or different frequencies) that you can measure the
> contrast of and
> > build up the MTF frequency by frequency. =A0So which do you
> have? =A0If
> > you have neither, you may be out of luck. =A0You might be
> able to
> > estimate it if you have a known, perfectly sharp edge in
> the image
> > (that gets blurred as it gets imaged). =A0I think you can
> estimate the
> > PSF if you have a known point or known edge in your
> image. =A0What kind
> > of image do you have?
> > Regards,
> > ImageAnalyst
>
> Hi:
>
> If I have an edge and it is blurred in the image, then how
> do I estimate the MTF from that image only?
> Thanks,
> AZ- Hide quoted text -
>
> - Show quoted text -

----------------------------------------
http://www.google.com/search?hl=3Den&q=3DMTF+edge+response
Best wishes,
ImageAnalyst