No, they are not. Could the metric be centered around the mean? Somebody with enough knowledge could check the code? Should I fill a bug report? Agus
On Fri, Sep 4, 2015 at 4:57 PM, Jordi Inglada <[email protected]> wrote: > Hi Agus, > > Maybe a silly question: are these negative values large? > > This could be due to numerical precision errors in the estimation, since > the entropy itself is estimated using histograms. > > Jordi > > Agustin Lobo <[email protected]> wrote: >> >> otbcli_FineRegistration using MI as metric produces negative values >> (saved to the 3rd layer of the result of otbcli_FineRegistration). >> >> For example, in >> otbcli_FineRegistration -ref StereoFixed.png -sec StereoMoving.png >> -out FineRegistrationMI.tif -erx 2 -ery 2 -mrx 3 -mry 3 -m MI >> >> The 3rd "band" of FineRegistrationMI.tif has negative values. >> >> As >> H(A+B) <=H(A)+H(B) >> and >> MI = H(A)+H(B)-H(A+B) >> >> MI cannot be <0 >> >> Any idea of what happens here? >> >> Thanks >> >> Agus >> >> -- > > -- > -- > 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.
