Posted by
David Faulstich Diniz Reis on
Jul 01, 2010; 7:30pm
URL: http://imagej.273.s1.nabble.com/Measuring-focus-sharpness-tp3687753p3687755.html
The pictures are scanned documents.
I need to validate the scanned document.
I think all the document have edges. :-)
The MTF plugin could help me?
<a href="http://rsb.info.nih.gov/ij/plugins/download/mtf/MeasureMTF_.html#measureMTF%">http://rsb.info.nih.gov/ij/plugins/download/mtf/MeasureMTF_.html#measureMTF%
28ij.ImagePlus%29
Thanks!
-----Mensagem original-----
De: Andreas Maier [mailto:
[hidden email]]
Enviada em: quinta-feira, 1 de julho de 2010 16:08
Para: ImageJ Interest Group
Cc: David Faulstich Diniz Reis
Assunto: Re: Measuring focus / sharpness
Hi,
usually you need an edge in the image to measure the "sharpness". Form
an edge you could estimate the modulation transfer function.
Do your images share a certain characteristic (as a certain edge) ?
Best,
Andreas
Am 7/1/2010 11:41 AM, schrieb David Faulstich Diniz Reis:
> Hi!
>
>
>
> I want to know IF anyone already made na algorithm to measure the image´s
> sharpness.
>
>
>
> I am trying to automatically apply an sharpness algorithm if needed.
>
>
>
> Reading I discover that we need to discover the spatial frequency. Mesure
> high spatial frequency / low frequency, and based on this result, apply
the
> sharpness algorithm.
>
>
>
> Thank you in advance.
>
>
>
> David
>
>
>
> www.infosolo.com.br
>
>
[hidden email]
>
> +55-61-33236808
>
>
>
>
--
Dr.-Ing. Andreas Maier
Stanford University
Department of Radiology
The Lucas Center for Imaging
Mail Code 5488, Route 8
Stanford, CA 94305
http://med.stanford.edu/profiles/Andreas_Maier/