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FFT and Golf Balls

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Old 01-29-2006, 10:37 PM
creeduk's Avatar
creeduk creeduk is offline
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Join Date: Feb 2005
Posts: 297
Originally Posted by creeduk
Just wanted to say this indepth thread made me go back and look at FFT, I had come across this filter in the past but misunderstood it, I had done the classic FFT then IFFT and see no result (of course..doh!) now reading this and going through old threads I have got it working. I still find it easier to use HSL as it shows the issue up clearer I think, I had some good success carefully cloning the vertical and horizontal lines which got rid of small highlights in that area that caused problems in the images.

So thanks for thrashing this subject again, this time it stuck for me
Having revisited this issue I have a sneaking suspicion that despite (or because of) having both filters I may have been using the wrong one. Hence my HSL comment. The examples I have worked on show the same pattern on red channel using the rgb as is seen on the blue channel using HSL version. Slaps forehead repeatedly.
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Old 01-31-2006, 05:52 PM
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mistermonday mistermonday is offline
Join Date: Dec 2005
Posts: 3,028
Well, this thread is so long it probably doesn't need another tail. However, I keep finding ways to get better results. On a duplicate of this image, I reduced the contrast and ran a Discrete Cosine Filter which did a much better job than any of the FFTs I had. I applied the output to a contrast enhanced version of the original and used a luminosity blend. A slight clean up in Neat Image. Finally a quick trip to LAB to attenuate the bright yellow stains.
Regards, Murray
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