Carnë Draug wrote: > Hi > > Octave seems to take a really long time to imread most of my multipage > tiffs. Sure, I'm talking about large ones, 2500 pages of 350x300 > pixels, but still I think it's too long. More than 3 hours. > > I picked one image and made substacks of it with different sizes. The > time to read one image (one page, not the whole file) increased with > the number of pages in the file, and seemed independent of the number > of pages I wanted to read. That is, even if I only tried to read the > first page of a file, if the file had many pages it would still take a > long time. I hope it's clear what I'm trying to explain. > > Don't know if this can be of any help, but the software I use for a > pre-analysis of my images (called ImageJ), it's free/open source > (public domain license according to wikipedia) and takes little more > than 4 seconds to read the same image that octave takes more than 3 > hours. I'm not complaining how octave is bad in comparison to others! > With my poor knowledge on the subject of programming, it just seems > that maybe it could be a good place to look if someone ever tries to > make it faster, without problems of licenses and in the good spirit of > sharing knowledge/code. > > Carnë >
Carnë, Are you running Octave 3.2 or the development version? The 3.2 suffers from poor imread performance. I patched octave to make imread 10x faster: http://hg.savannah.gnu.org/hgweb/octave/rev/13d382fc758b There might be a problem with multi-frame images, I don't have any such image so I can't tell. Do you read the image all at once or frame by frame? If the problem really is with imread, this should be reported to b...@octave, since imread is part of core. hth, David ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Octave-dev mailing list Octave-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/octave-dev
