Talk:Smoothing

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I can try to edit this page soon, perhaps tomorrow. Plf515 03:29, 24 November 2006 (UTC)plf515

Merging Smoothing with Curve fitting?[edit]

I would prefer not merging these, as they have different aims and contexts. Melcombe (talk) 09:27, 30 April 2008 (UTC)

Care to elaborate? Perhaps give an example of one that is not also an example of the other? Btyner (talk) 23:53, 1 May 2008 (UTC)
If you smooth an image, this is not an instance of curve fitting Tpl (talk) 12:20, 2 May 2008 (UTC)
I have added a little to attempt to distinguish smoothing from curve fitting. Melcombe (talk) 12:43, 20 May 2008 (UTC)

Note that the merger proposal was deleted following objections and no support. Melcombe (talk) 12:43, 20 May 2008 (UTC)

Interpolating splines[edit]

Why does someone insist on linking interpolating splines to this page? Interpolation is in no way "leaving out noise" (cf. paragraph 1). Unless the claim that an interpolation spline "is sometimes called smoothing" can be backed up by a credible reference, interpolation shouldn't be mentioned here.

Also, User:Melcombe: please be careful reverting edits. You might delete something perfectly legitimate, like a link to smoothing splines. --Zaqrfv (talk) 09:37, 3 September 2008 (UTC)

Smoothing vs Curve Fitting[edit]

Also, can someone rewrite the paragraphs comparing smoothing and curve fitting? What's presently there is just nonsensical. Curve fitting, as it's defined on wikipedia, is an umbrella term that covers interpolation, regression, smoothing and a whole host of other things. Failing a rewrite, everything except the first paragraph of the introduction should just be deleted (which would be my preference). --Zaqrfv (talk) 10:08, 3 September 2008 (UTC)

A brief reply. While it is true that curve fitting can be used for some types of smoothing, the terminology of curve fitting does not encompass all types of smoothing, for example not the way the term "smoothing" is used in image processing and computer vision. Hence, the notion of curve fitting cannot be regarded as an "umbrella term" for smoothing. Tpl (talk) 10:46, 3 September 2008 (UTC)
Ok, I'm talking as a statistician, so mean statistical smoothing. What would be much more useful than the present introduction would be separate one-paragraph summaries of smoothing in each main area of application (statistics, image processing, ...). From that base, the rest of the article could expand methods, and highlight similarities and differences of "smoothing" in different fields. --Zaqrfv (talk) 11:22, 3 September 2008 (UTC)

Smoothing in computational solvers[edit]

Smoothing goes far beyond data manipulation and signal processing. It is a major concept in computational solvers and numerical analysis and an inherent by-product of (simulated) Diffusion (but only casually mentioned in the Numerical diffusion article). Stationary iterative methods are also dubbed "smoothers" since they (iteratively) reduce the solution's error in the discrete domain by smoothing or averaging it out. These iterative smoothing methods are also an important part in the Multigrid method.
It might also be worth mentioning the fact that iterative "smoothing" and (simulated) "diffusion" are very similar: They eliminate high frequencies first and low frequencies are eliminated after many iterations/after a long time. In fact, infinite frequencies are eliminated instantly, which is why a vector field, only subject to diffusion, never has discontinuities.
Since my explanations are lacking rigor, I am hoping that someone with more insight can help out on this topic.
One other thing: Gilbert Strang often talks about "smoothing" (in the context of Elliptic solvers) in his course "Mathematical Methods for Engineers II".
1.162.65.247 (talk) 19:12, 23 January 2013 (UTC)

Smoothing in this sense is apparently just a synonym for relaxing. 1.162.65.247 (talk) 19:40, 23 January 2013 (UTC)