How to Automatically remove noise using Image historgram based?

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voxey
voxey 2019-7-23
编辑： Image Analyst 2019-7-29
How to Automatically remove noise using Image historgram based?

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Image Analyst
Image Analyst 2019-7-23
I don't believe so, at least not via a global operation, since the noise is likely very close to the local means. So you can't just look at the histogram and say all bright stuff is noise. Perhaps you can use a scanning method where you're looking at the histogram just in a local area and looking for outliers, like a sigma filter or something. There are some very good noise filters out there. For example, you might want to check out imnlmfilt() to do a non-local means noise reduction.
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KALYAN ACHARJYA
KALYAN ACHARJYA 2019-7-24
编辑：KALYAN ACHARJYA 2019-7-24
Yes sir, but how do we distinct between noise and information in such images?
Image Analyst
Image Analyst 2019-7-29
编辑：Image Analyst 2019-7-29
The filter makes that distinction, like the median filter assumes that the "signal" will be the median of values in the scanning window. If you have your own knowledge of what is signal and what is noise (even if it's probability distributions), then you can design a custom filter to take that into account.
I'm sure there are probably CT-specific papers on noise removal in medical images here in vision bibliography

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Ranjith veeran
Ranjith veeran 2019-7-23

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