Now its clear - and I understand ...! Thanks alot
Ofer On Tuesday, February 18, 2014 7:03:50 PM UTC+2, Guillaume Pasero wrote: > > Hi, > > - 'band3' is not a typo. As said by Jonathan, band3 contains *NCC > metric*values. By creating a mask of pixel with a correlation score higher > than > 0.9 you can select only good matches (NCC optimum is 1). > > - Band1 contains *horizontal **disparities*. Checking pixel values means > that you should check that the disparity values obtained on your scene are > coherent with the search interval specified in the BlockMatching > application. For instance: not setting the minimum horizontal disparity > low enough can prevent the matches on features with a high elevation. > > - Band2 *does *contain *vertical disparities* (which is obviously 0 > everywhere). When doing the BlockMatching step, you have to specify a > minimum and maximum vertical disparity for the exploration if you want to > see vertical residues. By default, min and max vertical disparities are > both set to 0 which imply no vertical exploration. > > Regards, > Guillaume > > Le 18/02/2014 17:37, Ofer Zilberstein a écrit : > > Hi Jonathan, > > Your answer confused me ... > > First - in the cookbook example -- otbcli_BandMath -il > disparity_map_ncc.tif -out thres_hdisparity.tif uint8 -exp > "if(im1b3>0.9,255,0)" which mean that the h' disparity is in band 3 ??? is > it a typo error ? > > > Second - checking the pixel values the disparity image the > values should not be between 0 -1 ? > > and finally - In my disparity image band 2 is empty ... > > can you help me resolve this puzzle ? > > Thanks in advanced > > Ofer > > > > > > > > > On Monday, February 17, 2014 11:03:56 PM UTC+2, Jonathan Guinet wrote: >> >> Hi below my response about Q1 >> >> Band1 : Horizontal Disparity map >> Band2 : Vertical Disparity Map >> Band3: Metric values >> >> The BlockMatch output has 3 bands, the fourth is computed by Monteverdi >> and does not exist in input imagee >> >> cheers >> >> >> >> 2014-02-17 17:33 GMT+01:00 Ofer Zilberstein <[email protected]>: >> >>> >>> Hi OTB uses, >>> >>> I would like to share my experience and raise some Q' regard the >>> process of extraction DSM from Pleiades Stereo Model >>> >>> This is my first step toward change detection between Pleiades fresh >>> imagery & existing geo-data-base >>> >>> 0) OS - Win 7 - 64bit >>> >>> 1) I have Pleiades Regular Stereo Model >>> >>> 2) I extracted ROI of 4000 x 4000 pixels for the left and then I >>> created ROI with -mode.fit option for the right (according to best >>> practice). >>> >>> 3) I started with StereoFramework, and after it crashed I followed >>> section 3.6 step by step and I successfully generated DSM file. >>> >>> 4) Although there are some typo errors (e.g - >>> in otbcli_StereoRectificationGridGenerator the -io.outimage1 should >>> be -io.outleft) the process went fine. >>> >>> *Q-1* - it is stated that otbcli_BlockMatching creates by default a >>> two bands image : the horizontal and vertical disparities. When I look at >>> the image (e.g. disparity_map_ncc.tif) with Monteverdi I see 3 bends and >>> amplitude. >>> >>> bend 1 has values between -43 to 5 >>> bend 2 is empty >>> bend 3 looks like disparity map with proper NCC values 0.5 to >>> 0.98 (I think that this is the horizontal) >>> bend 4 (named amplitude) has values between 0 to 40 >>> >>> In the step of filtering the NCC values (p. 81) , the example only >>> shows how to filter horizontal (bend 3) then concatenate thresholded >>> horizontal & vertical disparities... >>> >>> However - I cannot figure out where the vertical disparity resides ? >>> >>> ================================== >>> >>> *Q-2* - Is it correct' or essential for accurate DSM and ortho' to >>> follow chapter 3.2.5 Residual registration (between the two stereo images) >>> before the DSM extraction ? >>> >>> Thanks in advanced ... >>> >>> Ofer >>> >>> -- >>> -- >>> 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/groups/opt_out. >>> >> >> -- > -- > 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]<javascript:> > To unsubscribe from this group, send email to > [email protected] <javascript:> > 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] <javascript:>. > For more options, visit https://groups.google.com/groups/opt_out. > > > > -- > <http://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] <javascript:> > -- -- 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/groups/opt_out.
