Good luck. I've attached code for a sobel edge detection routine that may be of use.
--Chris On Fri, Jun 27, 2014 at 4:43 PM, Elżbieta Jakubska <[email protected]> wrote: > Thank you guys for your reply! I will try to face this:) > Ela > > 27 cze 2014 22:22 "Craig DeForest" <[email protected]> napisał(a): > >> Heh. Thanks for answering this, Chris. I missed it the first time >> 'round. >> >> Elzbieta, you can find whether a particular pattern is present in an image >> by convolving the image with the pattern you're looking for. The resulting >> convolved image will have a spike everywhere that the pattern is present. >> One PDL function you can use to do that is convolveND(). >> >> >> On Jun 27, 2014, at 6:24 AM, Chris Marshall <[email protected]> >> wrote: >> >> > Perl and PDL can be used for image processing. >> > Probably the easiest way to familiarize yourself >> > with PDL capabilities is to install PDL and then >> > look at the PDL Book. You can find this and other >> > PDL information starting at the PDL home page: >> > >> > http://pdl.perl.org >> > >> > --Chris >> > >> > On Tue, Jun 24, 2014 at 3:03 AM, Elżbieta Jakubska >> > <[email protected]> wrote: >> >> I need to compare many images to pattern image (logo) and find out >> >> which of >> >> them match the pattern (shape is more meaningful than colour). Logo has >> >> the >> >> same size, the same rotation etc on every picture, but backgrounds are >> >> different, including additional edges in interesting area. Till now I >> >> was >> >> doing this with Image Magick (edge detection + compare), but it is slow >> >> and >> >> not always works correctly. >> >> Is there a way to do this using PDL? Could anybody help me? >> >> >> >> Thank you very much! >> >> >> >> Ela >> >> >> >> _______________________________________________ >> >> Perldl mailing list >> >> [email protected] >> >> http://mailman.jach.hawaii.edu/mailman/listinfo/perldl >> >> >> > >> > _______________________________________________ >> > Perldl mailing list >> > [email protected] >> > http://mailman.jach.hawaii.edu/mailman/listinfo/perldl >> > >> >
sobel.pdl
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