advice needed on camera raw data image filtering...
From: lucy (losemind_at_yahoo.com)
Date: 11/01/04
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Date: Mon, 1 Nov 2004 13:17:33 -0800
Hi all,
We used camera to do some imaging and got some raw image data, which are
very noisy at the low signal end(where there should be some low signal) or
the dark end(where there should be no signal theoratically)... we have
learned from Jerry and others in DSP group that we should
take a picture of completely dark NULL object and then do a subtraction:
picture with meaningful object images - picture with NULL object =
noise-reduced image...
Then what do we do after that? Use what filter to reduce noise?
And there are some some spikes on both dark and bright regions. The bright
parts of the image are also noisy...
Please advise which type of filter can be best for denoising of such images,
hopefully the useful image parts will not be affected or minorly affected...
Are there any math reasonings?
Thanks a lot!
-L
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