Posted by
Jennifer West on
Aug 30, 2006; 10:00pm
URL: http://imagej.273.s1.nabble.com/Image-quality-evaluation-tp3695062p3695066.html
Hi Emmanuele and everyone,
Way back in July we were discussing image quality assessment. I have
been experimenting with using Sobel filters for assessing quality.
I've written a plugin that ranks images by their edges using the
"find edges" routine that is built into ImageJ.
If anyone is still working on this I would be interested to see how
the results from this routine compares to routines that others may be
using. Please let me know.
The plugin may be downloaded from:
http://www.umanitoba.ca/faculties/science/astronomy/jwest/plugins.htmlCheers,
Jennifer
___________________________________
Jennifer West, Instructor
Department of Physics and Astronomy
378 University College
University of Manitoba
Ph. 204-474-9501
On 12-Jul-06, at 4:06 AM, Emmanuele Sordini wrote:
> 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.html
>
>
> Nice 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