On Mon, Feb 11, 2013 at 8:18 PM, Pierre Roudier <[email protected]> wrote: > Thanks Markus and Eric, > > I have similar feedback when testing on various SPOT5 scenes. XL results are > not entirely identical of course, but reasonably similar, so I support > Markus' decision.
I can make the results more similar, but one reason why results are different between i.segment and i.segment.xl is that I had the impression that i.segment is doing over-segmentation, i.e. merging too liberally with the effect that some segments (objects), in particular large segments, were more heterogeneous than justified by the given merging threshold. With i.segment.xl, I tried to get results that are very similar to the eCognition results. Markus M > > Cheers, > > Pierre > > On Feb 11, 2013 10:53 PM, "Markus Metz" <[email protected]> > wrote: >> >> Hi all, >> >> I have tested again i.segment and discovered that for the NC Landsat >> 2000 imagery the module takes nearly 7 hours for reasonable >> segmentation. The i.segment.xl module does the same in 10 seconds. The >> region consists of 250 000 cells, not so much. In the documentation it >> says that processing the entire ortho image takes about a day. With >> the xl version it takes about 10 minutes. I am going to move the xl >> version to trunk and keep the original GSoC version in addons for >> reference. >> >> Markus M >> >> >> On Fri, Feb 8, 2013 at 5:47 AM, Eric Momsen <[email protected]> wrote: >> > Sorry for not responding right away, I hadn't realized the code sprint >> > started (finished?!) already. There is a paper deadline this month and >> > a >> > thesis to write that has consumed my attention... I don't think I'll >> > have >> > time for anything in February. If noone else wants/needs to do it >> > sooner, I >> > hope to have a break between my thesis writing and starting work this >> > summer. So in April(???) I will find some time to dedicate to GRASS >> > code >> > and/or documents again. >> > >> > -Eric >> > >> > >> > On Mon, Feb 4, 2013 at 3:01 AM, Moritz Lennert >> > <[email protected]> wrote: >> >> >> >> On 02/02/13 17:37, Markus Metz wrote: >> >>> >> >>> On Sat, Feb 2, 2013 at 12:56 PM, Moritz Lennert >> >>> <[email protected]> wrote: >> >>>> >> >>>> Markus and Yann, >> >>>> >> >>>> If you have the time it might be a great opportunity to use the >> >>>> community >> >>>> sprint to get i.segment from the addons to trunk. What do you think ? >> >>> >> >>> >> >>> I would prefer i.segment.xl for speed reasons and memory control, but >> >>> the shape functionality in i.segment would need to be ported to >> >>> i.segment.xl first. >> >> >> >> >> >> I meant i.segment in a global sens, not distinguishing .xl, so that's >> >> perfectly fine with me. >> >> >> >> Eric, any chance for you to look at integrating your work on shapes >> >> into >> >> i.segment.xl ? >> >> >> >> Moritz >> > >> > >> _______________________________________________ >> grass-dev mailing list >> [email protected] >> http://lists.osgeo.org/mailman/listinfo/grass-dev _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
