Posted by
Emmanuele Sordini on
Jul 12, 2006; 10:06am
URL: http://imagej.273.s1.nabble.com/Image-quality-evaluation-tp3695062p3695065.html
Hello Hennifer!
On 7/11/06, Jennifer West <
[hidden email]> wrote:
>
> Hi Emmanuele,
>
>
> I wrote a plugin that computes a "quality factor" based on a method
> that I read at this site:
>
http://acquerra.com.au/astro/software/ppmcentre/According to the webpage, this method is the same as the one used in
> Registax.
Unfortunately, the source code of ppmcentre is not available (link to tar
file broken?), so I can't comment on that method. But if it's used in
Registax it should be quite reliable. Could you perhaps provide me with the
latest version (i.e. tar archive) you have?
BTW, my webcam processing application of choice is Iris. For sure it's way
less user-friendly than Registax, but it's also more powerful.
I've only tested my plugin on two stacks of images (one of Jupiter
> and one of Saturn) and it seems to work reasonably well. But I would
> be very happy if you would like to test it and let me know how it
> works on your images. I've just posted it to my website and you may
> download it here:
>
http://www.umanitoba.ca/faculties/science/astronomy/jwest/plugins.htmlNice website! I also appreciate the "Save as FITS" plugin, which
inexplicably is not provided with ImageJ.
Let me know how this works for you!
I've done a very quick trial run on a 20-frame sample from an AVI file of
mine. Here's the outcome (frame numbers from 1 to 20 sorted in decreasing
quality order) as compared with the one from Iris:
Iris ImageQuality plugin
Frame # Score (times 10^11)
15 10 9.06731706255
19 15 9.06724426944
12 9 9.06694117833
17 1 9.06688137711
20 2 9.06688128297
10 18 9.06685968411
13 20 9.06681322122
11 6 9.06679849284
4 17 9.06679361922
8 7 9.06678465756
9 16 9.06666556767
18 19 9.06645265785
3 4 9.06644101764
5 12 9.06637309293
14 3 9.06632877069
1 8 9.06630080046
2 14 9.06627718458
7 13 9.06626186028
6 5 9.06622588776
16 11 9.06609830427
As you can see, it turned out to be quite different from Iris. But we know
that probably "no two image quality indicators are alike" :-)
Emmanuele