Topic: Beyond Photoshop - truely deblurring anything in a picture

Oh, the joys of digging into advanced algorithms and finding a gem

http://www.focusmagic.com/

When I was in Uni, 10 years ago, studying Computer Science and Computer Graphics, we implemented motion blur fix, and gaussian/median blur fix and a few other cool [pre/post/.]processing and segmentation techniques.

For the motion blur fix, we had a 512x512 image blurred with a 256px wide kernel. I let you imagine the soup of pixels we had to unblur. But the result image was surprisingly good for such extreme conditions. The result was quite close to the original + some kind of ghost of the ultra motion blurred image ... probably a border effect due to the huuuge kernel used to blur the image.

I normally have a few notes left from Uni. I could check if you want. IIRC the motion blur fix was done in Frequency space.

Sounds good I am not aware of any PS plugin of this kind, and that was the
angle of this thread - more tools for pixel works.

Please feel free to mail away if you find the notes (mauro@ any of my domains).

Actually, this is a tad different : it's about deconvolution, and it's not hard - identify "areas" of blurring,
apply deconvolution to little discs for the depth of field, and streaks for the motion blur - me,
I need something slightly different, and pretty much got it, but thanks, it's always welcome.

My surprise here : why, oh WHY aren't such kinds of algorithms available in Photoshop already?
As you said, "ten years ago...". Oh well.

http://www.cs.unm.edu/~brayer/vision/fourier.html

WJ: Thanks for the link. I wish I had been able to find that one when I was struggling with Fourier transforms in college.

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-- not necessarily stoned... just beautiful.

I've been struggling with FT for quite some time. Like months or something. I can understand a lot of stuff, but getting things into my personal context can be a problem. The other day I Googled "2d fft" and got some really good stuff on the first page. One of them has a java applet that really put it all together for me.

Now I just gotta figure out how to translate the formal equations into code. Formal equations are something that I have a hard time with.

I was thinking about it last night and I wouldn't be surprised if FT is how Photoshop does Gauss/High Pass (et al) with such alarming speed. And I'm willing to bet FT is how that old KPT Equalizer filter works.

http://www.fmwconcepts.com/misc_tests/FFT_tests/