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FFT and Golf Balls

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  #71  
Old 06-01-2005, 08:08 AM
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Wink Magic Bullet

Fourier image processing is one of those "Magic Bullets" that is almost entirely useless except for those rare (but highly impressive) occassions where they are de rigueur.
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  #72  
Old 06-02-2005, 05:31 PM
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Tutorial?

Despite the shortcomings of the filter mentioned, I wonder would Cameraken, Flora, or someone else here like to put all this together as a tutorial in the tutorial section? I know that the steps are listed out in several threads already, but having it all in one spot would be good - and I thought the images in Camerakens step by step were very clear and would help someone coming to the process new. In fact I think just taking those posts and putting them in the tut section would be great.

(As an aside I tried using Ro's step by step previously, but without screenshots it mean I became very frustrated when it didn't work. It was only a month later when I tried it on another image I realised it was because the photo I was working on did not have a suitable pattern therefore did not have any 'stars'.)
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  #73  
Old 06-02-2005, 06:30 PM
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And just to add to caitlen's suggestion, it would be great if their was a Macintosh tutorial as well. I did see that there are a couple of packages for the Mac, but I'm not sure if there are any tutorials on those.
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  #74  
Old 06-02-2005, 08:27 PM
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If nobody beats me to it, I'll put up a tutorial this weekend.
That is, if you can stand me going on and on and on about FFT just a bit more!!

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  #75  
Old 06-02-2005, 08:51 PM
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Thanks byRo,
I look forward to being able to get to grips with this technique. I may only see a couple of photos a year that fall into this category but when you have them sitting on your monitor staring at you, it's good to know there is a solution.

The following attachment was presented to me yesterday. I don't know if it's a good candidate for FFT or not but it would be worth a try.
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File Type: jpg ltphoto3GS.jpg (65.5 KB, 41 views)
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  #76  
Old 06-02-2005, 09:09 PM
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Thanks for your comments Caitlin.

I started this thread because I was having so much trouble, especially with the newer FFT RGB for which the tutorials are very scarce.

I wrote that tutorial to help everyone else struggling with this new version

I have learnt a lot from this thread and I thank everyone so much for their contributions so far.
As you mentioned FFT is not perfect for all images but as an initial starting point for removing texture IMO there is nothing to beat it.

I hope there is more input regarding FoveaPro as this looks good. But I think we will have to wait for byRo to do this.

I would be happy to re-write the tutorial and move it to the tutorial section. And if any mac users would like to volunteer their services we could perhaps do a version for deadants. But I don’t think there is a mac FFT Alex-Chirokov available.
However as Byro has offered to do this we may be better leaving it to the experts.

Off Topic
The original picture I posted was from a much larger picture. By coincidence I have just been asked to do another so I thought I would show you where it came from.

There may be a copyright issue with posting this so I’ve blurred it but it will give the general idea.

This picture is 24” x 8” and the original photo I posted was from part of one of these – Hardly surprising that texture became a problem.
I have restored a bit. few more hours to go.

I use ExclaimPT Tutorial to Stitch the scans which works great.


Ken
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File Type: jpg small.jpg (83.7 KB, 38 views)
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  #77  
Old 06-08-2005, 04:49 PM
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FFT tutorial

For whoever is planning to do the FFT tutorial, I happened upon this one - Rather nicely done - a shame it's in Greek!

FFT tutorial (Or in this case babelfish English) The original is here: http://www.dpgr.gr/index.php?page=FourierPS
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  #78  
Old 06-09-2005, 03:00 PM
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Well found Caitlin.

This is a tutorial on FFT RGB so it is the version we have been talking about here.
Babelfish did a pretty good job of translating this.

This is what I managed to understand from this site

1) Again another confirmation that the stars should be painted out in black
2) They are using a square picture as an example but do not seem to insist on square
3) They use blending mode set to colour to put the colour back.
4) They are using gaussian blur on the final image to clean up further.


Does anyone speak Greek


Ken
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  #79  
Old 06-09-2005, 03:17 PM
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Some speak Greek, others speak Geek. Unfortunately, I speak neither.

Dave
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  #80  
Old 06-09-2005, 03:34 PM
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Duv


It would make more sense to me in Double Dutch

Ken
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