Talk:Noise reduction

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Reorganize Topics[edit]

Please consider reorganizing this topic and other image processing topics along the lines of the directory found at http://homepages.inf.ed.ac.uk/rbf/CVonline/transf.htm which includes these topics for noise reduction.

Noise Reduction and Image Restoration (See also Image Restoration) 

  1. Adaptive Smoothing
  2. Anisotropic Filtering
  3. Average/Mean Smoothing
  4. Bayesian Filtering
  5. Bilateral Filtering
  6. Brightness Distortion Correction
  7. Color Images
  8. Conservative Smoothing
  9. Crimmins
 10. Deconvolution/Inverse Convolution
 11. Diffusion Methods
 12. Edge-Preserving Smoothing
 13. Gaussian Smoothing
 14. Global Filters
 15. Kuwahara
 16. Lee's Local Statistics Filter
 17. Local Nonlinear Image Restoration
 18. Median Filtering
 19. Median Flow Filtering
 20. Median Least Variance/Median Coefficient of Variation Filters
 21. Monte Carlo Markov Chain Restoration
 22. Multichannel/Multispectral Filtering
 23. Other Smoothing Algorithms
 24. PDE, Diffusion Methods
 25. Rank Order Filtering (See also Median Filtering)
 26. Savitzky-Golay Filtering
 27. Scale-Space Filtering (See Scale Space)
 28. Spline Filtering
 29. Temporal Averaging
 30. Wiener Filtering

Image Stacking[edit]

A great way to remove noise without signal loss is to take several identical images and adding/averaging them. This is used a lot in astrophotography, where the ultra-long exposures necessary to capture faint nebulae, etc. still shows a lot of random noise. Since the noise is "white", its average over many exposures tends to zero, so SNR is increased dramatically. —Preceding unsigned comment added by 98.196.183.78 (talk) 23:49, 27 March 2009 (UTC)[reply]

Industrial Noise Reduction[edit]

What about industrial noise reduction? -- 142.85.5.141 16:14, 4 June 2007

What about it? Is it audio? --Adoniscik (talk) 22:18, 2 February 2008 (UTC)[reply]

Split proposal[edit]

The following discussion is closed. Please do not modify it. Subsequent comments should be made in a new section. A summary of the conclusions reached follows.
The result was no concensus NativeForeigner Talk/Contribs 00:37, 2 March 2010 (UTC)[reply]

User:Binksternet‎ has started a process to split the article into audio noise reduction and image noise reduction; I've reversed the process for now, so we can talk about it first. Please support or oppose this proposal, and if you support say which new article to move the current article to (so we don't lose the history).

  • oppose, at least weakly for now, not having heard any good idea how is this is going to make things better. Dicklyon 04:57, 3 September 2007 (UTC)[reply]
  • support, naturally, since it's my idea. The problem I have with the basic Noise reduction page is that the audio noise reduction products and image noise reduction products available to the end user have nothing obvious in common. Photoshop and Dolby SR don't look at all alike to the end user. Trying to tie them together in the text of the page turned out to be very convoluted. I see the Siamese Twinning of both audio and image noise reduction as a barrier to clarity and a damper to future development of the two topics. Too many new products, methods and realizations regarding audio and regarding image are coming down the pike but these developments aren't common to users in the two camps. Image noise reduction technicians and audio noise reduction technicians are usually two completely different populations with little crossover. These two populations will come to the page, peruse for a few seconds, and turn away upon realizing that it isn't tightly focused on their concerns. I feel that future Wiki editors will look at this confusing admixture of topics and choose not to bring their value to the page. I'd much rather have two pages, each one catering to a specific group. Two pages will encourage further development.
Of course it's true the two topics have a commonality in their mathematical foundations. I would like to see the commonality emphasized in the digital signal processing and analog signal processing pages, or for there to be a new page called Noise reduction (signal processing) which details the approaches common to image and audio, digital and analog. An architect's viewpoint instead of a home dweller's viewpoint.
Personally, I have nothing to offer to the notional page Image noise reduction. I know precious little about image noise. I have a lot to add to Audio noise reduction in the way of phonograph record surface noise reduction methods, studio recording noise reduction equipment, broadcast noise reduction practices and software noise reduction methods and results. My background is all about audio production. Binksternet 05:50, 3 September 2007 (UTC)[reply]
  • Oppose the change until the article is developed further. Not lagre enough for a split yet. --Blainster 07:38, 3 September 2007 (UTC)[reply]
  • support, YES. As written, the article is about a few specific things. Please split into as many different items as necessary. In addition to signal processing of images and signal processing of acoustic signals there are whole fields of engineering dealing with reducing the volume of audible noise and another dealing with improving the 'quality' of audible noise. S.Rutherford —Preceding unsigned comment added by 138.250.75.170 (talk) 09:49, 3 July 2008 (UTC)[reply]
  • conditional support ... I actually think that there should be THREE articles: There is little overlap between video/image noise reduction and Audio noise reduction, but what little overlap there is does deserve its own article. —Preceding unsigned comment added by Cojoco (talk • contribs) 01:07, 4 August 2008 (UTC)[reply]
  • support; The sections are on subjects that are, at a glance, not significantly related (though in the mathematics of them they are very similar.) I would say that each is a stub, and needs to be recognized as such.Flying Bishop (talk) 14:56, 15 September 2008 (UTC)[reply]
  • support; The subjects are not significantly relatedTelecine Guy 18:44, 18 September 2008 (UTC)
The discussion above is closed. Please do not modify it. Subsequent comments should be made on the appropriate discussion page. No further edits should be made to this discussion.

Merge of Dynamic_Noise_Reduction into this article[edit]

The article Dynamic_Noise_Reduction was nominated for deletion with the conclusion to merge it into the In_audio section of this article. That merge has apparently been done, and now the final disposition of the Dynamic_Noise_Reduction article needs attention by someone with the powers to address it. I just posted more about this on the talk page of that article, and I won't repeat it here. Please see that talk page: [[1]] 71.242.26.9 (talk) 13:09, 17 January 2009 (UTC)[reply]

I finished it up be redirecting to the section in this merged article. Dicklyon (talk) 20:54, 17 January 2009 (UTC)[reply]

How to reduce the sound of AHU[edit]

Hi, Please give some ideas to reduce the sound of AHU in open ceiling. —Preceding unsigned comment added by 59.97.57.13 (talk) 10:05, 20 October 2009 (UTC)[reply]

Add a Sample[edit]

I've recorded a sound file that I think is a great example of noise removal from an audio signal. Any tips to add it? 24.5.216.172 (talk) 00:33, 15 March 2010 (UTC)[reply]

Human Brain[edit]

Are there any studies about noise reduction by the human brain? It would be interesting to incorporate into the article. --Scandum (talk) 19:39, 11 May 2011 (UTC)[reply]

The following article looks interesting, though I've got difficulty making sense of it: http://www.pnas.org/content/95/23/13988.full --Scandum (talk) 19:44, 11 May 2011 (UTC)[reply]

The hiss[edit]

A description like "caused by random electrons that, heavily influenced by heat, stray from their designated path" is unscientific and even ignorant, because electrons have no "designated path", and have no paths in the common sense. Moreover, as electrons are indistinguishable particles, any individual electron has no its own "path" at all. Apparently, the so named "hiss" is either thermal noise or shot noise, or maybe both. I am convinced that a link to one of these, or both, must be placed instead of the current crap. Incnis Mrsi (talk) 06:48, 30 August 2011 (UTC)[reply]

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