Mailman 3 February 2014 - scikit-image

Re: skimage and opencv
by Emmanuelle Gouillart 22 Sep '16

22 Sep '16

Hi FranÃ¯Â¿Â½ois, that's an excellent question, and not a troll :-). Opencv is a very powerful library, but it focuses primarily on computer vision (feature detection and extraction, classification, ...), as opposed to image processing in general (with other tasks such as denoising, segmentation, ...). The other big difference is that skimage builds on numpy ndarrays, and uses the full power of the numpy API (including of course the basic facilities for processing arrays as images that come with numpy), as well as some of scipy functions (you could have added scipy.ndimage to your list -- a few functions in skimage are wrappers around scipy.ndimage, that exist for the sake of completeneness). One important consequence is that algorithms working for 3-d or even n-d images can be easily implemented in 3-d/n-d in skimage, whereas opencv is restricted to 2-D images (as far as I know). Thanks to the use of numpy arrays, the API of skimage is also quite pleasant for a numpy user, more than the API of opencv. A related difference is that skimage is written in python and cython, whereas opencv is a C++ library. The two libraries attract a different crowd of developers, and a Python/Cython toolkit based on numpy arrays is easier to develop and maintain inside the Scientific Python ecosystem. I'm sure that other devs/users will have things to add to this discussion! Cheers, Emmanuelle On Thu, Dec 27, 2012 at 02:06:08PM -0800, FranÃ¯Â¿Â½ois wrote: > Hi users and devs, > It came to my knowledge that another python library (based on C++ and C > codes) for image processing exists too : opencv > I understand that numpy intregrates some basic features and we need some > advanced features but I have the feeling that skimages is redoundant with > opencv in some ways. > What's the position of skimage about that? (Don't read this question as a > troll but like a real question). > I mean that similar features exist in both. Would not be possible to > reuse/integrate opencv or merge? what's the reason for keeping them apart? > My observation is there is 4 libraries to manipulate images: > * PIL > * numpy > * skimages > * opencv > That's a lot. > Cheers,

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Re: Contribution: circles and hough transform
by François 18 Jun '14

18 Jun '14

Hi, FYI, I plan to work on the detection of ellipses quite soon. Stefan indicated to me a reference which seems fairly simple to implement. Cheers, François.

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Re: "Cythonize" not working on OSX?
by Stéfan van der Walt 06 Jun '14

06 Jun '14

On Mon, 03 Feb 2014 16:44:07 +1100, Juan Nunez-Iglesias wrote: > I didn't know this was a possible course of action! =) I have no idea how > many people are affected, or how quick a fix can be... Is it worth > exploring a bit more before reversing it? I actually have very little idea > about the entire build process so I can't offer much insight here... It broke the build on my system too (perhaps it does not check correctly for old versions), so my preference is to revert and have another look at it. StÃ©fan

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Re: ANN: SciPy 2014 Conference, July 6th - 12th, Austin, TX!
by Steven Silvester 09 Mar '14

09 Mar '14

I hope to be there sprinting as well. > >

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GSoC mailing list
by Stéfan van der Walt 27 Feb '14

27 Feb '14

Hi everyone, Further communications about skimage's GSoC should please go to: https://groups.google.com/forum/#!forum/skimage-gsoc All mentors, if you would kindly subscribe there as well. Thanks Stéfan

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An Intro to scikit
by Rishabh Raj 27 Feb '14

27 Feb '14

Hi, Am interested in pursuing a project with sci-kit with the Summer Of Code. A brief bio about myself - I'm an undergraduate student @ IIIT, Hyderabad (that's in India). An ex-GSoC'er (GSoC '13 with MoinMoin wiki) pursuing a Bachelors in Technology, majoring in Computer Science and Engineering. I completed a course on Digital Image Processing (last semester). I believe at some point I used the library for assignment purposes :) In general i'm proficient in C/C++/Python and have a keen interest in systems. I have had experience developing a Linux based terminal in C with minimal support for standard IPC operations as part of the Operating Systems course. I'm interested in pursuing the project on creating an Interactive Gallery, developing such a web-app running a sandboxed Python, returning images after processing in realtime, sounds pretty interesting. One basic query I have is, is there a plan in mind for scaling? OR do we want to allow running this on a local instance rather than on some online server officially supported by scikit? It would be great if we could discuss more about this and how should we proceed further. Is email on the list the best way for communication? What is the timezone for most devs? Is there a preference order for selecting projects? Do we know how many slots would we get? Best, Rishabh Raj http://web.iiit.ac.in/~rishabh.raj/sharkden/

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Re: GSoC 2014 (mentors)
by Johannes Schönberger 27 Feb '14

27 Feb '14

I just signed up… On Feb 27, 2014, at 11:53 AM, Stéfan van der Walt <stefan(a)sun.ac.za> wrote: > On Thu, Feb 27, 2014 at 2:10 PM, Johannes Schönberger > <hannesschoenberger(a)gmail.com> wrote: >> I can also sign up as a mentor and help out, but I won't have too much time >> this summer. So most of the work would be on your shoulders. > > Thanks, Johannes, having you as a backup mentor would be very helpful! > > -- > 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.

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Re: GSoC 2014 (mentors)
by Johannes Schönberger 27 Feb '14

27 Feb '14

I can also sign up as a mentor and help out, but I won't have too much time this summer. So most of the work would be on your shoulders. On Wednesday, February 26, 2014 6:43:10 AM UTC-5, Juan Nunez-Iglesias wrote: > > It's also worth noting that currently (if I remember correctly) only > Stefan and I are signed up, and we need a minimum of 3 mentors to be listed > under the PSF... So, any other volunteers are very much appreciated!!! > > > > On Wed, Feb 26, 2014 at 5:14 PM, Stéfan van der Walt <ste...(a)sun.ac.za<javascript:> > > wrote: > >> If you would like to mentor for Google Summer of Code this year, >> please raise your hand so that I know! >> >> On Mon, Feb 24, 2014 at 12:28 PM, Stéfan van der Walt <ste...(a)sun.ac.za<javascript:>> >> wrote: >> > Hi everyone >> > >> > If you are interested in mentoring for Google Summer of Code this >> > year, please fill in the following form: >> > >> > >> https://docs.google.com/forms/d/1wEaF22w2sKQY4iWxzFKmuYPf6ZEgV4uUKEKssHFSTB… >> > >> > And join these two mailing lists: >> > >> > https://mail.python.org/mailman/listinfo/soc2014-general (subscribe to >> > this one to talk to prospective students) >> > https://mail.python.org/mailman/listinfo/soc2014-mentors (subscribe to >> > this one for announcements, reminders & mentor discussion.) >> > >> > Discussions for the PSF GSoC effort on IRC: #python-gsoc on Freenode. >> > >> > Thanks >> > 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...(a)googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> > >

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Re: Requetsted Feature - Blob Detection
by Vighnesh Birodkar 27 Feb '14

27 Feb '14

Hello Juan By a labeled region I am guessing you mean a 2d array in which all pixels within the blob are set to a value ? That would involve extra computation in this case. The algorithms mention ( at least DoG and LoG ) do not compute the pixels belonging to the blob, How about returning a list of tuples of (x,y,area). Than should be generic enough I guess Thanks Vighnesh On Thursday, February 27, 2014 7:32:26 PM UTC+5:30, Juan Nunez-Iglesias wrote: > > Hi Vighnesh, > > I'm not familiar with blob detection algorithms, but I will say that in > general in scikit-image we try to shy away from new classes, and prefer to > represent things with numpy arrays wherever possible. I think an integer > image with one labeled region per blob would be appropriate (and could be > piped into regionprops). > > Juan. > > > > On Thu, Feb 27, 2014 at 5:41 PM, Vighnesh Birodkar <vighnesh...(a)gmail.com<javascript:> > > wrote: > >> Hello >> >> I am applying as a GSoC student for scikit-image this year. Last year I >> was a GSoC student for SimpleCV. To start contributing I wanted to >> implement Blob Detection ( DOG and LOG initially ). >> >> I wanted to have some guidelines as to where to put the code and how to >> structure it.Is there any piece of code lying around in scikit-image which >> I can use as a template for Blob Detection ? >> >> I would put the new code inside a new .py file inside features. I think >> it would be a good idea to keep the prototypes identical for all blob >> detection algorithms. My first intuition is to return a class ( or a >> dictionary ) with some attributes set. Some blob detection algorithms may >> compute the area of the blobs as well while some might not. Or I can just >> return the (x,y) coordinates. >> >> Please point out if I am mistaken somewhere. >> >> Thanks >> Vighnesh >> >> -- >> 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...(a)googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> > >

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Requetsted Feature - Blob Detection
by Vighnesh Birodkar 27 Feb '14

27 Feb '14

Hello I am applying as a GSoC student for scikit-image this year. Last year I was a GSoC student for SimpleCV. To start contributing I wanted to implement Blob Detection ( DOG and LOG initially ). I wanted to have some guidelines as to where to put the code and how to structure it.Is there any piece of code lying around in scikit-image which I can use as a template for Blob Detection ? I would put the new code inside a new .py file inside features. I think it would be a good idea to keep the prototypes identical for all blob detection algorithms. My first intuition is to return a class ( or a dictionary ) with some attributes set. Some blob detection algorithms may compute the area of the blobs as well while some might not. Or I can just return the (x,y) coordinates. Please point out if I am mistaken somewhere. Thanks Vighnesh

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