Hi,
Can someone help me out with inverse distance filter?
I intend to clean up a map (called B1-map) which is supposed to be smoothly varying. Please see the attached figure.
The left most figure is the simulated B1-map and the right one is the returned B1-map from the intermediate step. As you can see, there are salt-pepper like artefacts in right figure which I would like to get rid of. My understanding is that I can use inverse distance filter for such purpose.
Also, it would be nice to recover everything part of B1-map faithfully; but, none the less the central part with voxels having smaller intensities (< .07-.08) is not that important.
Any help would be greatly appreciated.
This is for my work that I plan to publish in near future. So, I can give due credit to you for your help (like referring to your work).
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Original map:
https://drive.google.com/file/d/0B0Ah9soYnrlISm9UX29UakVIYlU/view?usp=sharing
map with salt pepper like artefacts:
https://drive.google.com/file/d/0B0Ah9soYnrlIRUNxQ215cXUxZmc/view?usp=sharing
These images are in tiff format and can be easily read using matlab as:
d = imread(inputFilename);
Regards
DK
Dear Dushyant Kumar,
Try to use the Wiener filter. It is implemented in Matlab and has simple form of management.
Hi Ruslan,
Yes, Wiener filter or median filter would work fine for the current case. However, I expect little bit more than that. Sorry for not putting very good representative image.
Actually the B1-map in the post correspond to the case when I simulated high SNR data (~400) and then inverted that. I usually use SNR of 200 whenever I collect experimental data and inverted B1-map is not that bad even at that SNR. But, I would like to SNR of < 100 and median filter does not do good job there.
I was interested in "inverse distance filter" as it appears to me that it may help me in estimating some part more faithfully as it would look much beyond local neighbourhood.
Please see the attached figure (Panel- B; 4th column under heading FAE-map). This should be comparable to magnitude-of-B1-map in panel-A. I am interested in improving FAE map because that would help me improve MWF-map-spatial-regularization (Panel-B; 3rd column).
Regards,
Dushyant
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