Re: Image quality evaluation

Posted by Thomas Boudier-2 on Jul 11, 2006; 4:27pm
URL: http://imagej.273.s1.nabble.com/Image-quality-evaluation-tp3695062p3695071.html

Hi Emmanuele,

As concerns Astronomy i can suggest you to have a look at SalsaJ, a
derivative from ImageJ that is customized for astronomy, it is
multilingual and incorporates special features like aperture intensity
measurement. You can have a look at :
http://www.euhou.net/index.php?option=com_content&task=view&id=7&Itemid=9

As about registration for astronomical images we are currently thinking
of implementing a registration procedure based on classical
cross-correlation in Fourier Space, but of course you can use TurboReg
for instance.

Thomas

Emmanuele Sordini a écrit :

> Hello everybody,
> I am a new ImageJ user and ML member. My main interest in ImageJ stems
> from
> my amateur astronomy activities (astronomical imaging and image
> processing).
>
> Let's suppose the following scenario: I have a set of 16-bit B/W
> frames of
> the same target (typically, a planet or a deep-sky object) that have
> to be
> registered, sorted for quality and stacked. The biggest problem I'm faced
> with is what image quality indicator should be used for reliable sorting.
>
> The image quality metric should be easy to figure out and not very
> demanding
> in terms of computing power; yet, it should somehow reflect the relative
> abundance of details and features on the current frame, which (if I'm not
> mistaken) should result in relative abundance of high-frequency
> components
> in the FFT domain. The literature mentions quite a few "one-number"
> quantities: RMSE, SNR, peak SNR, and so on... but I'm quite puzzled. I've
> also come across some "perceptual indicators" which integrate
> quantitative
> measurement and quality as perceived by the human eye, but I'd rather not
> venture into this domain for the moment.
>
> Any ideas/suggestions/links/references on the subject will be highly
> valued.
>
> Thanks in advance,
> Emmanuele Sordini
>
> P.S. Should anybody be interested in my amateur astronomy work, please
> feel
> free to check out my website: www.bloomingstars.com
>
> .
>

--
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    Thomas Boudier, MCU Université Paris 6,
    Imagerie Integrative,Institut Curie - INSERM U759.
    Tel : [phone]  Fax : [phone]
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