Dear Julien, Thanks for your replay. Is also my thinking right that the output files generated by training/validation procedure are with confusion matrix but it is regarding only the validation dataset. The .txt file generated for the late classification with TrainImagesClassifier does not have a confusion matrix for the training set.
Many thanks Thayse Nery On 11 September 2015 at 22:56, Julien Michel <[email protected]> wrote: > Dear Thayse, > > You are right, for now sampling of training/validation set is tied to > training inside TrainImagesClassifier application, it is therefore > impossible to know exactly which pixels have been selected to form the > training set. Please note that we have ongoing developments on separating > the sampling step from the training step, and therefore giving full insight > on the sampled training set [1]. > > Right now this is only a prototype written by Paul Gely, but we intend to > integrate this is the classification workflow of Orfeo ToolBox. > > Regards, > > Julien > > [1] https://github.com/PaulGely/AppSampling > > > Le 11/09/2015 16:49, Hristo Nikolov a écrit : > > One more suggestion - check here > https://www.orfeo-toolbox.org//packages/OTBCookBook.pdf page 278 > > On Friday, 11 September 2015 15:09:15 UTC+3, Hristo Nikolov wrote: >> >> Dear Thayse , >> >> Could you please describe the way you use OTB? >> My experience with OTB is as part of QGIS. >> I could say that the output files generated by >> training procedure are with confusion matrix and >> the model file. Also in the log window of the GUI >> have the conf. matrix as well. >> >> Good luck >> Hristo >> >> >> On Thursday, 27 August 2015 09:48:25 UTC+3, Thayse Nery wrote: >>> >>> Hi all, >>> >>> I am doing an object based Land Use changes classification and I have my >>> sample training with almost 20000 pixels. I used the TrainImagesClassifier >>> and selected the ratio between training and validation samples to be 70% >>> training and 30% validation. >>> >>> As we know, this tool generates 2 files, one is the transition matrix >>> for the validation set and the other one is .txt file for the training set. >>> I would like to have a transition matrix also for my training set. But >>> since its generates only a text file, I am not able to Compute a Confusion >>> Matrix for it. I can use this text file only for the Image Classification >>> but I do not know how to access the performance for the training sample >>> based on the F-score, precision, recall and overall accuracy. >>> >>> I would like to know if it is possible to* calculate a confusion matrix >>> for this training samples*. I could have used my original shapefile to >>> do that, but since the TrainImagesClassifier uses some calculation such >>> as the maximal size of the available validation sample list per class will >>> be equal to the surface area of the smallest class multiplied by the >>> validation sample ratio, I do not know exactly which samples were selected >>> for the training and validation samples. >>> >>> Thanks for any help! >>> >>> Cheers, >>> Thayse Nery >>> >> -- > -- > 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. > > > > -- > 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 a topic in the > Google Groups "otb-users" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/otb-users/ITIprvSWHhc/unsubscribe. > To unsubscribe from this group and all its topics, 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.
