Mailman 3 April 2013 - scikit-image

Image Feature Suggestion
by Ronnie Ghose 16 Apr '13

16 Apr '13

Hey guys, I was wondering if you could suggest feature extraction methods to try on an image. So I was wondering given for example a gif of a wheel spinning or (something easier I should think because it has discrete branches spinning) a carousel spinning how could you identify the branches in each frame and tell the approximate radian shift, and then also do that given a slight translation in the picture - ex. a shaky video camera? Thanks, Ronnie

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Re: Cython memoryviews
by Juan Nunez-Iglesias 16 Apr '13

16 Apr '13

Hey guys, On Tue, Apr 16, 2013 at 4:00 AM, Stéfan van der Walt <stefan(a)sun.ac.za>wrote: > cnp.ndarray[dtype=float, ndim=2] -> double[:, ::1] > Can you explain this syntax to me? I'd understand double[:, :], but not sure I get double[:, ::1]. Are you indicating that the array should be interpreted in C order? Would double[::1, :] indicate a Fortran-order array? And is double[:, ::1, :] invalid? Finally, can you take any array as input and reinterpret as a one-dimensional array?

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Re: Google Summer of Code 2013
by Umesh Sharma 16 Apr '13

16 Apr '13

I start implementing that edge detection algorithms and the move on to the segmentation part after 19th april . Thank you Umesh Kumar Sharma 4th year UG student IIT Kharagpur

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Re: Google Summer of Code 2013
by Umesh Sharma 15 Apr '13

15 Apr '13

Hello Stefan , I am talking about first order or second order differential edge detectors (laplacian ,laplacian of gaussian ). So is it useful to implement because already canny edge detector is implemented in scikit-image . Thanks Umesh Kumar Sharma 4th year UG student IIT Kharagpur

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Re: Cython memoryviews
by Tony Yu 15 Apr '13

15 Apr '13

On Mon, Apr 15, 2013 at 5:30 PM, Stéfan van der Walt <stefan(a)sun.ac.za>wrote: > As such, let's use that from now on, and slowly start working on > converting the old code: > > cnp.ndarray[dtype=float, ndim=2] -> double[:, ::1] > I'm all for using memory views in our code, but we'll have to make sure to bump up the Cython requirement to 0.16 (either that or include the generated source, as someone else suggested recently). Last time I tried to use memory views<https://groups.google.com/forum/?fromgroups=#!topic/scikit-image/Fzdtoo8AUZ0>, bumping the version was an issue, but that was before Ubuntu supported Cython 0.16. We should update `setup.py` and the install docs. Cheers, -Tony

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Re: Errors while compiling and $make coverage
by Ankit Agrawal 15 Apr '13

15 Apr '13

Hi Stefan, Thanks again, that worked. Regards, Ankit Agrawal On Tue, Apr 16, 2013 at 3:58 AM, Stéfan van der Walt <stefan(a)sun.ac.za>wrote: > On Tue, Apr 16, 2013 at 12:27 AM, Ankit Agrawal <aaaagrawal(a)gmail.com> > wrote: > > I get these test errors. If I want to test the code before issuing a PR, > > this will be a problem. Any way to sort it out? Thank you again. > > It's because that version is trying to run the tests in-place. To fix > it, you can also build the modules in-place: > > python setup.py build_ext -i > > Stéfan > > -- > You received this message because you are subscribed to the Google Groups > "scikit-image" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to scikit-image+unsubscribe(a)googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- Regards, Ankit Agrawal, Senior Undergraduate in Electrical Engineering. IIT Bombay. +91 9833427046

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Cython memoryviews
by Stéfan van der Walt 15 Apr '13

15 Apr '13

Hi all I've recently done some more benchmarks with Cython, and memoryviews are significantly faster than the array syntax. It's also easier on the eye! As such, let's use that from now on, and slowly start working on converting the old code: cnp.ndarray[dtype=float, ndim=2] -> double[:, ::1] Stéfan

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Re: Errors while compiling and $make coverage
by Stéfan van der Walt 15 Apr '13

15 Apr '13

On Tue, Apr 16, 2013 at 12:27 AM, Ankit Agrawal <aaaagrawal(a)gmail.com> wrote: > I get these test errors. If I want to test the code before issuing a PR, > this will be a problem. Any way to sort it out? Thank you again. It's because that version is trying to run the tests in-place. To fix it, you can also build the modules in-place: python setup.py build_ext -i Stéfan

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Re: Errors while compiling and $make coverage
by Ankit Agrawal 15 Apr '13

15 Apr '13

Hi Stefan, Thanks for your prompt reply. Actually, yes I can use the package already. But when I do $make coverage I get these test errors. <http://pastebin.com/LySbvnPG> If I want to test the code before issuing a PR, this will be a problem. Any way to sort it out? Thank you again. Regards, Ankit Agrawal. On Tue, Apr 16, 2013 at 3:48 AM, Stéfan van der Walt <stefan(a)sun.ac.za>wrote: > Hi Ankit > > On Tue, Apr 16, 2013 at 12:12 AM, Ankit Agrawal <aaaagrawal(a)gmail.com> > wrote: > > My Cython and Numpy are updated to latest version. I have > tried > > recloning the repo and recompiling it four times. The second line of my > > installation log says, > > From your installation log, it looks like it was successful. > > Regards > Stéfan > > -- > You received this message because you are subscribed to the Google Groups > "scikit-image" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to scikit-image+unsubscribe(a)googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- Regards, Ankit Agrawal, Senior Undergraduate in Electrical Engineering. IIT Bombay. +91 9833427046

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Re: Errors while compiling and $make coverage
by Ankit Agrawal 15 Apr '13

15 Apr '13

Hi all, My Cython and Numpy are updated to latest version. I have tried recloning the repo and recompiling it four times. The second line of my installation log <http://pastebin.com/xZ42xi61> says, non-existing path in 'skimage/_shared': 'tests' i.e. the tests folder in skimage/_shared/ could not be found. But it's also not present in the master repo on github. Also could you also make sense of the lines 97-98 that say, 1. warning: no files found matching 'setup.cfg' 2. no previously-included directories found matching 'doc/build' I would like to get over with this as quickly as possible. I can't figure out if I am doing something wrong. Thank you. Regards, Ankit Agrawal.

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