Hi, Maybe outliers in your list of homogous points pairs between band 2 and band 4 ? Have you manually inspected your matching pairs of points ? Since there is almost no scaling and no rotation, you could just compute (dx,dy) for each matching pair, and plot it in order to find if there are wrong matches.
Regards, Guillaume On 09/01/2015 02:21 PM, Agustin Lobo wrote: > I'm testing Rigid Transformation Resample to apply a model fitted out > of set of Homologous Points. (I'm also testing using a model derived > from interactive > points as well as Fine Registration, but that's another story). > > Interband misalignments are substantial as the images come from a > multicam aboard a drone. 5 bands (B,G,R,REdge,NIR). > > The procedure is > 1. otbcli_HomologousPointsExtraction between each band and band 4 > (taken as reference band) > 2. Fit a model in R. Example of model: > s alfa dx dy > 1 1.0029784 0.06989697 -5.819075 -3.871411 > 2 1.0069938 0.02176913 -45.387618 -5.723231 > 3 1.0029354 0.02747776 25.232517 7.283582 > 4 0.0000000 0.00000000 0.000000 0.000000 > 5 0.9994018 0.04154600 3.444670 2.325798 > > So essentially no scaling, small rotation (~1 to 4 deg) and substantial > shifts. > > 3. Apply model with otbcli_RigidTransformResample (2 times for each > image, one for the rotation then for the translation) > > After testing in 5 images, I get very good results for all bands > except for band 2, where the shift seems to be overestimated by > several pixels . > > Any idea on why? > > Thanks, > > Agus > -- <www.c-s.fr> *Guillaume PASERO* Ingénieur d'études et développement *Business Unit E-SPACE & Geo Information* <https://thor.si.c-s.fr/blogs/cs-blogs-business/>*- Département 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 - [email protected] -- -- 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.
