Thanks, but please specify that ranger refers to an euclidean spectral distance in the doc. Agus
On Mon, Dec 15, 2014 at 2:46 PM, Julien Michel <[email protected]> wrote: > Le 15/12/2014 10:08, Agustin Lobo a écrit : >> >> Consider the workflow provided in >> http://www.orfeo-toolbox.org/CookBook/CookBooksu42.html >> >> 1. Which metric is the one being used as "ranger" in >> otbcli_MeanShiftSmoothing >> and otbcli_LSMSSegmentation? is it just a range >> of DN to be applied to each single band? is it an euclidean distance >> in the space of all bands? > > It is a spectral euclidean distance. > >> >> 2. For otbcli_LSMSSegmentation: how are pixels included in one cluster >> in the case of multi-spectral images? The manual sates >> "This application will produce a labeled image where neighbor pixels >> whose range distance is below range radius (and optionally spatial >> distance below spatial radius) will be grouped together into the same >> cluster." >> but this is unambiguous just in the case of one single band. How is >> the multi-band case managed? Are pixels grouped if their range >> distance is <= ranger for all bands? > > Since range distance is euclidean it is a R^n -> R application, so there is > no ambiguity. > >> >> 4. Are images normalized before the "range distance" is calculated? > > No, it is the responsibility of the user to provide an input feature space > where euclidean distance is (at least a bit) meaningful. >> >> >> Thanks for clarifying these details, they do matter for the user to >> select the appropriate ranger parameter. > > > If you did not already read it, you can read our paper which explains into > details this method : > > http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6849524&queryText%3DArbitrarily+large+remote+sensing+images > > Regards, > > Julien > > -- > Julien MICHEL > CNES - DCT/SI/AP - BPI 1219 > 18, avenue Edouard Belin > 31401 Toulouse Cedex 09 - France > Tel: +33 561 282 894 - Fax: +33 561 283 109 > > -- > -- > 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 [email protected] > To unsubscribe from this group, send email to > [email protected] > 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 [email protected]. > For more options, visit https://groups.google.com/d/optout. -- -- 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 [email protected] To unsubscribe from this group, send email to [email protected] 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
