Thoughts on how to enhance an image |
Thoughts on how to enhance an image |
Jun 20 2009, 12:35 AM
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#16
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Here is a difference image between Mark8c and Marck9. (Looks like a chunk shifted down and to the right between 8c and 9)
-------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Jun 20 2009, 12:39 AM
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#17
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
-------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Jun 20 2009, 01:01 AM
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#18
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
And now, one last blink comparing the (B&W converted and contrast stretched) original lettering, with my processing from mark9 hi-res:
(click to animate) The "V" is definitely visible, the "illa" and "0" can be seen with some imagination, and the "d" in Sunderland is also evident. Spooky. -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Jun 20 2009, 06:59 PM
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#19
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Junior Member Group: Members Posts: 94 Joined: 22-May 08 From: Loughborough Member No.: 4121 |
Excellent stuff Mike, thank you !
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Jun 21 2009, 12:49 AM
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#20
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
Here is the second high res image (converted to grayscale)
Same technique - all images done the same way: * adaptive rank order filter to median-out serious outlier pixels in a kernel * then a few different sizes of a histo-equal filters run over the image to do smart contrast * summed in the output image and finally averaged by pixel - * run time is 2 secs per big image on an old laptop, * using just a home brew c++ program to do the processing * the 'gray edges' are the original image at the bottom of the average stack. Mike: awesome blinks ! Jekbradbury: nice color work - I like the de-correlation stretch maneuver - I am looking into that....! I invite anyone to further process my images in this thread if they want to - hopefully some one can pull something more out of them PFK: thanks for the interesting background story and challenge. Cheers -------------------- CLA CLL
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Jun 21 2009, 01:40 AM
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#21
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Member Group: Members Posts: 104 Joined: 1-June 08 Member No.: 4172 |
I wonder how useful it would be to apply one of these greyscale techniques in conjunction with a decorrelation stretch; there is definitely a significant amount of information hidden in the differences between the color bands, but noise-removal techniques would help bring this out. PDP8E, could you try applying your technique to all three bands of the input image separately and see what happens, either in RGB or YCbCr space?
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Jun 21 2009, 01:52 AM
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#22
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
jekbradbury,
I am on it! back in a day or two.... -------------------- CLA CLL
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Jun 23 2009, 02:52 AM
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#23
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
OK...I took the last big color image and took it apart into color bands (RGB)
* I applied the same technique above (noise reduction, and then histo-equal via stochastic stamping) to each band independently * then put the RGBs back together in one image and then I did the same without the noise reduction cheers -------------------- CLA CLL
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Jun 25 2009, 10:45 AM
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#24
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Junior Member Group: Members Posts: 94 Joined: 22-May 08 From: Loughborough Member No.: 4121 |
again, fascinating stuff - thank you!
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