Talk:Spatial filter

Start
Here's a start for spatial filter. Someone with professional optics knowledge should add the tech side. Also, no entry for "pinhole" or "aperture plate" is on WP. --Wjbeaty 05:39, 19 January 2006 (UTC)

Pinhole
I started a stub for pinhole and added reference to that and this page to websites of optics vendors. Those should probably be updated to textbook references later, but these are quite good anyway. 2pem (talk) 14:21, 13 January 2014 (UTC)

Multivariate spatial filters
On signal processing, a spatial filter for multivariate signals means a filter which use the information of various channels to remove artifact or extract information. It has to be distinguished from standard "frequency" filter (IIR FIR, wavelet, Kalman) which use the various time samples to remove the noise. Spatial filtering is often affiliated to Blind signal separation. — Preceding unsigned comment added by Samuelboudet (talk • contribs) 16:21, 19 July 2012 (UTC)
 * That looks like an unrelated concept. Wikipedia articles are organized by concept, not by name. Things which are conceptually distinct but share the same name are covered in separate articles, with navigational aids to help readers find the right article. Things that are the same but are known by different names are all covered together in one article.--Srleffler (talk) 01:24, 20 July 2012 (UTC)

Beamforming
I agree with the earlier comment that "spatial filtering" is often used more broadly than this optics device. The article on Beamforming links back to this page (as I think it should, I have definitely heard of beamforming described as "spatial filtering"), yet this page in its present state has little to do with combining signals from receivers situated in space to achieve directional selectivity. This was jarring enough to actually prompt me to create a Wikipedia account! I'm not sure how to fix the situation though - should there at least be a "See also" link to Beamforming? --Rosnfeld (talk) 14:55, 29 July 2012 (UTC)
 * The article on beamforming should not have linked to this page. Since spatial filtering is a synonym for "beamforming" in that context, the correct solution was to identify it as such in the first line of that article, and not to link to an article on another subject that happens to have the same name. To help readers who end up at this article by mistake, I have added a note at the top that says "For the signal processing technique, see Beamforming. This will help readers who were searching for the term, but wanted the other article.--Srleffler (talk) 15:45, 29 July 2012 (UTC)

TEM modes
So, if I wanted to fourier filter to only get the TEM01 and TEM10 Hermite-Gaussian modes, and block the even modes, how would I do that? What would the filter be like? 14.0.224.248 (talk) 12:22, 5 September 2018 (UTC)
 * You would want a filter that was designed to have minimum overlap between its transmitting regions and the TEM00 mode, and maximum overlap with the modes you want. Best guess, you would want a small spot of zero transmission in the center to block TEM00 and some absorption far from the axis to block higher-order modes. (The higher the order the more intensity there is away from the axis.)--Srleffler (talk) 04:58, 6 September 2018 (UTC)

Copyright problem removed
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