Re: [otb-users] matrix multiplication in Band Math?

[Guillaume Pasero]

Hi, Here is an example where I flip the component order of a 3-band image : > otbcli_BandMathX -il image.tif -out inv_image.tif -incontext context.txt Where the input context contains both the matrix and the _expression_ : > cat context.txt #M kernel1 { 0 , 0 , 1; 0 , 1 , 0; 1 , 0 , 0 } #E im1 * kernel1 Regards, Guillaume PS : the cookbook gives more details about BandMathX : https://www.orfeo-toolbox.org/CookBook/CookBookse14.html#CookBooksu56.html On 06/23/2016 08:33 AM, Agustin Lobo wrote: Also, cannot find the syntax for matrix multiplication in BandMathX Agus On Wed, Jun 22, 2016 at 3:26 PM, Agustin Lobo <alobolis...@gmail.com> wrote: Thanks, Regarding BandMathX, I understand I would do it through Monteverdi2 and inputing my parameters using "Import context" What format should that file have? In my example, just a 7x7 matrix with blank separated values? Can I also do it with otbcli_BandMathX ? Agus On Wed, Jun 22, 2016 at 10:27 AM, Guillaume Pasero <guillaume.pas...@c-s.fr> wrote: Hi Agustin, The BandMath only produces 1 output band. So you would have to use 7 formulas for each output channel, and concatenate bands. On the other hand, BandMathX should be able to do the job. You can set the 7x7 kernel in a constant file (incontext) Guillaume On 06/22/2016 10:03 AM, Agustin Lobo wrote: Can I apply a matrix of factors to a multi-spectral image using BandMath? i.e. ima %*% f where ima: multi-spectral image (i.e. 2000 x 900 x 7) f: matrix of coefficients, i.e. 7x7 matrix %*% matrix multiplication ima would be operated as a 1800000 x 7 matrix Thanks Agus -- Guillaume PASERO Responsable technique Business Unit E-SPACE & Geo Information - Département Image & Applications CS Systèmes d'Information Parc de la Grande Plaine - 5, Rue Brindejonc des Moulinais - BP 15872 31506 Toulouse Cedex 05 - FRANCE +33 561 17 64 21 - guillaume.pas...@c-s.fr -- -- Check the OTB FAQ at http://www.orfeo-toolbox.org/FAQ.html You received this message because you are subscribed to the Google Groups "otb-users" group. To post to this group, send email to otb-users@googlegroups.com To unsubscribe from this group, send email to otb-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/otb-users?hl=en --- You received this message because you are subscribed to the Google Groups "otb-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to otb-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- Guillaume PASERO Responsable technique Business Unit E-SPACE & Geo Information - Département Image & Applications CS Systèmes d'Information Parc de la Grande Plaine - 5, Rue Brindejonc des Moulinais - BP 15872 31506 Toulouse Cedex 05 - FRANCE +33 561 17 64 21 - guillaume.pas...@c-s.fr -- -- Check the OTB FAQ at http://www.orfeo-toolbox.org/FAQ.html   You received this message because you are subscribed to the Google Groups "otb-users" group. To post to this group, send email to otb-users@googlegroups.com To unsubscribe from this group, send email to otb-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/otb-users?hl=en --- You received this message because you are subscribed to the Google Groups "otb-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to otb-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.