Nicolas Robidoux wrote: > > > There are already two fast nonlinear resamplers implemented in GEGL: > > YAFR (gegl-sampler-yafr.c) > > and > > Nohalo-sharp (gegl-sampler-sharp.c). > > I'm not familiar with those two resamplers. Of course, that's not saying much, because it's not my area of expertise. I should mention, however, that I consider NEDI and ICBI interpolators of a different kind than most. First of all, they are very slow compared to bicubic. Speed is not the goal. Secondly, they don't provide a value for any point in between given pixels. Rather, their purpose is to enlarge the image in question by a factor of 2 (roughly. Actually it's size*2-1). After scaling, the image can be resampled to any size desired using other methods. Both algorithms copy known (given) pixel values into a 2x enlarged grid and then fill in the gaps between pixels using certain assumptions about the statistical values of the pixels. The main benefit of both algorithms is the performance around edges. ICBI is an improvement on NEDI. Edges are much smoother and more natural than bicubic. Basically, these would be useful for creating high-quality scaled versions of images where you can leave them to work for a while. For instance, I tried to run ICBI (in an inefficient matlab implementation) on a 3072x2304 image, and I ended up stopping it after about 30 mins. I would expect a C implementation to be much faster (especially because it wouldn't thrash the HD as much, since it would be designed with the purpose in mind instead of using general purpose functions). I explain all this to try to decide if the goal of ICBI is different than nohalo, and if there would be a reason to try to code it. Is there a paper I can read on nohalo? Or examples of results that I could compare to ICBI? Bill -- View this message in context: http://www.nabble.com/Advanced-Interpolation-tp21637127p21645818.html Sent from the Gimp Developer mailing list archive at Nabble.com. _______________________________________________ Gimp-developer mailing list Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
