# [Scilab-users] Hilbert transform query

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## [Scilab-users] Hilbert transform query

 Hello A quick query. How would one define the Hilbert transform of a grid for X and Y directions; looking for two solutions Hx and Hy (for the real values). Thanks Lester _______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users
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## Re: Hilbert transform query

 Le 05/02/2016 10:56, Lester Anderson a écrit : > Hello > > A quick query. How would one define the Hilbert transform of a grid > for X and Y directions; looking for two solutions Hx and Hy (for the > real values). Can you explain more precisely what you expect?   Do you want to apply Hilbert transform to each column and to each rows or to perform a 2D Hilbert transform? Serge > > Thanks > Lester > _______________________________________________ > users mailing list > [hidden email] > http://lists.scilab.org/mailman/listinfo/users> _______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users
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## Re: Hilbert transform query

 Hi Serge, I am working with grid data, so looking for the 2D Hilbert, the results I think should appear similar to doing a directional derivative, where X highlights features with N-S trends and E-W for Y. Lester On 5 February 2016 at 12:24, Serge Steer <[hidden email]> wrote: > Le 05/02/2016 10:56, Lester Anderson a écrit : >> >> Hello >> >> A quick query. How would one define the Hilbert transform of a grid >> for X and Y directions; looking for two solutions Hx and Hy (for the >> real values). > > Can you explain more precisely what you expect? >  Do you want to apply Hilbert transform to each column and to each rows or > to perform a 2D Hilbert transform? > Serge >> >> >> Thanks >> Lester >> _______________________________________________ >> users mailing list >> [hidden email] >> http://lists.scilab.org/mailman/listinfo/users>> > > _______________________________________________ > users mailing list > [hidden email] > http://lists.scilab.org/mailman/listinfo/users_______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users
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## Re: Hilbert transform query

 Any time you go from 1D to 2D you suddenly end up with more than one way to do things, so I'm pretty sure that "how would one..." should really be worded "how would YOU...", or perhaps "how would someone in this field...". It sounds like you want to keep things rectilinear, so it may be best to just apply the transform column-by-column and row-by-row.  That SHOULD work, and if you do it as matrix operations it should be pretty fast in Scilab. On Fri, 2016-02-05 at 12:52 +0000, Lester Anderson wrote: > Hi Serge, > > I am working with grid data, so looking for the 2D Hilbert, the > results I think should appear similar to doing a directional > derivative, where X highlights features with N-S trends and E-W for Y. > > Lester > > > > On 5 February 2016 at 12:24, Serge Steer <[hidden email]> wrote: > > Le 05/02/2016 10:56, Lester Anderson a écrit : > >> > >> Hello > >> > >> A quick query. How would one define the Hilbert transform of a grid > >> for X and Y directions; looking for two solutions Hx and Hy (for the > >> real values). > > > > Can you explain more precisely what you expect? > >  Do you want to apply Hilbert transform to each column and to each rows or > > to perform a 2D Hilbert transform? > > Serge > >> > >> > >> Thanks > >> Lester > >> _______________________________________________ > >> users mailing list > >> [hidden email] > >> http://lists.scilab.org/mailman/listinfo/users> >> > > > > _______________________________________________ > > users mailing list > > [hidden email] > > http://lists.scilab.org/mailman/listinfo/users> _______________________________________________ > users mailing list > [hidden email] > http://lists.scilab.org/mailman/listinfo/users-- Tim Wescott www.wescottdesign.com Control & Communications systems, circuit & software design. Phone: 503.631.7815 Cell:  503.349.8432 _______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users