From: Martin C. <mj...@sc...> - 2005-02-13 23:07:12
|
I am not sure exactly where the problem is. I was being lazy and letting resample filter out half of my images in z after i joined them all together, with arguments like -s x1 x1 x.5 -cheap ... and this was causing some unexpected bogus values. It may be that this is what was causing the zeroed data that I was seeing, or it may be in addition to that. I will make my script just skip half of the images in the join. I used unu histo to verify that I should have values only where I expect valid bins. a join with all the slices gave me the correct behavior where my lazy resample as in above gave me counts in bins where I should have none. Let me know if you need help reproducing this, and thanks for all the help :) --mc On Sun, 2005-02-13 at 13:52, Martin Cole wrote: > fyi, I updated this morning, and am still seeing the holes with the -k > box and am currently rerunning with just the -cheap flag. I'll let you > know how it turns out. > > --mc > > On Sun, 2005-02-13 at 13:41, David Weinstein wrote: > > Hi, > > > > Thanks for this thorough description, Gordon. > > > > One question... > > > > > So: in fact, you *MUST* use the "-k box" kernel in conjunction with > > > "-cheap" if you want to achieve the every-Nth subsampling that we're > > > talking about. This is due to the simplicity of what the cheap flag > > > is doing- its just making the kernel be scaled according to the input > > > sample spacing, and not the output sample spacing (which is what > > > normally blurs the input on downsampling). By using the box kernel, > > > you're creating a little window which is only big enough to admit one > > > value from the old domain, and that's the value that gets chosen. > > > Hopefully that made some sense. > > > > So, what happens if I use some kernel other than "-k box" with the > > -cheap flag? > > > > Dave > > > > > > > > ------------------------------------------------------- > > SF email is sponsored by - The IT Product Guide > > Read honest & candid reviews on hundreds of IT Products from real users. > > Discover which products truly live up to the hype. Start reading now. > > http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click > > _______________________________________________ > > teem-users mailing list > > tee...@li... > > https://lists.sourceforge.net/lists/listinfo/teem-users > > > > ------------------------------------------------------- > SF email is sponsored by - The IT Product Guide > Read honest & candid reviews on hundreds of IT Products from real users. > Discover which products truly live up to the hype. Start reading now. > http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click > _______________________________________________ > teem-users mailing list > tee...@li... > https://lists.sourceforge.net/lists/listinfo/teem-users |