Hi Thiago, >> I agree that we should first merge the GSOC code from this year before >> we start thinking of a new segmenter. Let me know if you need any >> help. However, I think both a graph-cut-based segmenter and SIOX could >> have a place in GIMP side-by-side. Graphcut-based segmenters and SIOX >> have different complementary properties. It is going to be a GUI >> challenge though because it requires expert knowledge to know when to >> use which. > > I do believe that using both algorithms could be a nice solution. In fact, > it was my original proposal and I am willing to try to merge both methods. Except the main issue is that it would require expert knowledge to know which one to use. I think the challenge is to provide the user with a nice way of switching between the two. This will become even more complicated once the detail refinement brush is implemented in the main branch to deal with border inaccuracies. >> Thiago: I can give you a couple of pictures that you should try with >> your segmenter and then compare against SIOX... especially those with >> a lot of texture and semi-transparent layers. The new version of SIOX >> can cope with them very well. Graph-based segmentation algorithms >> can't because they look for a minimum cut, which is a problem because >> especially those highly complicated pictures require a lot of time to >> do manually. > > I would be very glad if you could provide me some of these examples, because > it would really help me with my research. Also, I would like to state that > our approach is *not* based on the min-cut/max-flow algorithm, so it does > not suffer with many of its drawbacks. Right now my current job is to deal > with soft segmentation in an attempt to cope with the transparency issue, > and we already have some good solutions. First: Try any image that works well and add 80% noise. SIOX is pretty good with noise. Last time I tried Grabcut with such an image, I got a segmentation fault... Then: Try images like this one: http://www.bigfoto.com/themes/nature/winter/tree-winter-village.jpg and try to extract the tree. The current GIMP version in the main branch cannot do it, the version from last Google Summer of Code can do it. Graph-based algorithms usually have problems but I think this is an important feature because it saves HOURS of work to be able to do it semi-automatically! Gerald -- Dr. Gerald Friedland International Computer Science Institute 1947 Center Street, Suite 600 CA-94704 Berkeley, USA http://www.gerald-friedland.org _______________________________________________ Gimp-developer mailing list Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
