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Kunal Chaudhury

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Indian Institute of Science

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24 Jun 2014 Screenshot Fast Bilateral Filter Fast O(1) implementation of the bilateral and the joint (or cross) bilateral filter. Author: Kunal Chaudhury bilateral filter, nonlinear diffusion, edgepreserving diffus..., anisotropic diffusion, edge preserving diffu... 144 9
  • 4.0
4.0 | 1 rating
04 Mar 2013 Screenshot Non-Local Patch Regression Robust image denoising in patch space (non-convex extension of the non-local means algorithm). Author: Kunal Chaudhury nonlocal means, patch regression, patch based method, image denoising, lp minimization, nonconvex optimizatio... 16 0
11 Feb 2013 Screenshot Non-Local Euclidean Medians Non-local patch-based image denoising using Non-Local Euclidean Medians (NLEM). Author: Kunal Chaudhury nonlocal means, patch regression, nonlinear diffusion, kernel methods, convex optimization, robustness 21 3
  • 4.0
4.0 | 2 ratings
14 May 2012 Screenshot Multiresolution Gabor-like transforms Matlab implementation of the multiresolution Gabor filters in 1 and 2 dimensions. Author: Kunal Chaudhury gabor function, wavelet transform, fractional bsplines, algorithm, amplitudephase repres... 28 0
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09 Jun 2014 Non-Local Euclidean Medians Non-local patch-based image denoising using Non-Local Euclidean Medians (NLEM). Author: Kunal Chaudhury

Royi Avital: NLEM does better than the classic NLM on images that have lot of sharp intensity jumps. Taking the Euclidean median (instead of the mean) gives better robustness for such images.

29 Apr 2013 Fast Bilateral Filter Fast O(1) implementation of the bilateral and the joint (or cross) bilateral filter. Author: Kunal Chaudhury

Ben: Yes, you can modify the code for volume data as well. The dimension of the data is immaterial.

20 Nov 2012 Fast Bilateral Filter Fast O(1) implementation of the bilateral and the joint (or cross) bilateral filter. Author: Kunal Chaudhury

Yes, it can introduce artifacts in the output if the actual T is much larger than 255. This could well be the case near edges
when processing images corrupted by noise
with large sigma. A better guess in this case would be T + C(sigma), where C(sigma) is a reasonable upper bound on the intensity variation induced by noise.

19 Nov 2012 Fast Bilateral Filter Fast O(1) implementation of the bilateral and the joint (or cross) bilateral filter. Author: Kunal Chaudhury

One can always use a good guess of the local dynamic range. The 'maxfilter' is not required in this case. Note, however, that the local dynamic range can be much smaller than 255(the global gynamic range) for a grayscale image, and in some cases, it might be difficult to make a good guess of T (eg, if there's a lot of noise).

21 May 2012 Fast Bilateral Filter Fast O(1) implementation of the bilateral and the joint (or cross) bilateral filter. Author: Kunal Chaudhury

Thanks Derek. Bug fixed.

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09 Jun 2014 Non-Local Euclidean Medians Non-local patch-based image denoising using Non-Local Euclidean Medians (NLEM). Author: Kunal Chaudhury Kunal Chaudhury

Royi Avital: NLEM does better than the classic NLM on images that have lot of sharp intensity jumps. Taking the Euclidean median (instead of the mean) gives better robustness for such images.

08 Jun 2014 Non-Local Euclidean Medians Non-local patch-based image denoising using Non-Local Euclidean Medians (NLEM). Author: Kunal Chaudhury Royi Avital

Is it any better than the classic NLM?

22 Oct 2013 Non-Local Euclidean Medians Non-local patch-based image denoising using Non-Local Euclidean Medians (NLEM). Author: Kunal Chaudhury Regan Dhakshnamurthy

nice.but what about NLEM version for color image ?

29 Apr 2013 Fast Bilateral Filter Fast O(1) implementation of the bilateral and the joint (or cross) bilateral filter. Author: Kunal Chaudhury Kunal Chaudhury

Ben: Yes, you can modify the code for volume data as well. The dimension of the data is immaterial.

20 Apr 2013 Fast Bilateral Filter Fast O(1) implementation of the bilateral and the joint (or cross) bilateral filter. Author: Kunal Chaudhury Ben

A quick question before trying it: does the code support 3D image?

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