Mailman 3 May 2015 - scikit-image

Regionprops Clarification
by Joel Frederico 13 May '15

13 May '15

http://scikit-image.org/docs/dev/api/skimage.measure.html#regionprops If we look at the documentation, the attribute weighted_moments_central uses the region's centroid to subtract when calculating the moments. Shouldn't it use the region's weighted_centroid values? Does it and it just doesn't say that? I'm a bit confused.

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Re: No fixed-width font for homepage?
by Stefan van der Walt 08 May '15

08 May '15

On 2015-05-07 20:46:05, Juan Nunez-Iglesias <jni.soma(a)gmail.com> wrote: > Thanks Johannes! > > Incidentally, there's some much nicer monospace fonts out > there... Off the top of my head: Liberation Mono (Fedora's free > font), Inconsolata, Adobe Source Code Pro. Any interest in using > one of those? My browser already uses Dejavu Sans Mono by default--but PRs are welcome! Stéfan

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Re: No fixed-width font for homepage?
by Johannes Schönberger 08 May '15

08 May '15

https://github.com/scikit-image/scikit-image-web/pull/26 <https://github.com/scikit-image/scikit-image-web/pull/26> > On May 7, 2015, at 8:04 AM, Juan Nunez-Iglesias <jni.soma(a)gmail.com> wrote: > > Here's a screengrab of rendering on my browser: > > <Screen Shot 2015-05-07 at 10.02.51 pm.png> > > -- > 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 <mailto:scikit-image+unsubscribe@googlegroups.com>. > For more options, visit https://groups.google.com/d/optout <https://groups.google.com/d/optout>.

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What classes to use in scikit
by Iacopo Guarneri 07 May '15

07 May '15

Hello everyone! I'm trying to learn to use scikit learn Correct me if I'm wrong, from what I understand (much easier) scikit is used in this way: 1) instantiate the class for the type of learning / prediction (eg: svm, IsotonicRegression, LinearRegression etc ...) 2) launch class.fit to learn 3) launch class.predict to predict The biggest problem I have at the point 1, I understand when to use supervised learning (classification or regression) and unsupervised, but do not know which class to instantiate. I do not have a project in mind, I am interested for educational purposes and in order to solve this problem I would like to know: 1) you can advise me the best 3 classes for the 3 types of learning ( unsupervised (classification, regression) and unsupervised)? 2) you can recommend a page which explains the various classes and the cases in which are to be used? thanks :)

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No fixed-width font for homepage?
by Juan Nunez-Iglesias 07 May '15

07 May '15

Here's a screengrab of rendering on my browser: [image: Inline image 1]

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Re: GSoC 2015 - Accepted Students
by Aman SIngh 06 May '15

06 May '15

Hi Everyone, @Juan and @Stefan Thanks for the suggestions. I will keep them in mind for future posts and correct the typos in previous blogs. @Ralf RSS feed of the blog is acsgsoc15.wordpress.com <http://t.strk03.email/e1t/c/5/f18dQhb0S7lC8dDMPbW2n0x6l2B9nMJW7t5XYg8pTxS8V…> /feed/ Aman On Wed, May 6, 2015 at 11:42 AM, Ralf Gommers <ralf.gommers(a)gmail.com> wrote: > > > On Wed, May 6, 2015 at 7:50 AM, Stefan van der Walt <stefanv(a)berkeley.edu> > wrote: > >> Hi Aman >> >> On 2015-05-05 20:34:42, Aman SIngh <ug201310004(a)iitj.ac.in> wrote: >> >>> I have changed my blog address to acsgsoc15.wordpress.com If you can >>> see it and give some suggestions, that would be very helpful. For future >>> posts I will surely keep in mind the suggestions on blog writing. >>> >> >> I've updated the link on the wiki: >> >> https://github.com/scikit-image/scikit-image/wiki/GSoC-2015 >> > > Hi Aman, what is the address to use for RSS feed? The PSF admins need > that, and I'd also like to add it to planet.scipy.org > > Ralf > > > -- > 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/d/optout. > -- Aman Singh Coordinator Programming Club Sophomore, Computer Science and Technology Indian Institute of Technology, Jodhpur

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Re: GSoC 2015 - Accepted Students
by Stefan van der Walt 06 May '15

06 May '15

Hi Aman On 2015-05-05 20:34:42, Aman SIngh <ug201310004(a)iitj.ac.in> wrote: > I have changed my blog address to acsgsoc15.wordpress.com If you > can see it and give some suggestions, that would be very > helpful. For future posts I will surely keep in mind the > suggestions on blog writing. I've updated the link on the wiki: https://github.com/scikit-image/scikit-image/wiki/GSoC-2015 Thanks for sharing your first blog post! I think it would help to clarify the difference between variables with types and without types. To say that the [] operator is slow in Cython is misleading, because mostly you will only use that operator once you've defined the type of the array. Avoid phrases like "these work best", and try to specify what you mean. For example, instead of saying "In NumPy arrays modes can also be specified. Like ‘c’ or ‘fortran’ types. These work best when according to our mode of iteration on arrays(row or column wise). ‘c’ mode works best when the iteration is row wise and ‘fortran’ for column wise. " try something like "The memory layout of a NumPy array can be either Fortran-order (elements unpacked along columns) or C-order (elements unpacked along rows). It is best to access the elements of the array in the same order that they appear in memory, in order to make efficient use of caching." As always, the standard disclaimer: feedback is given (on blogs, PRs and the like) not because we enjoy being critical, but because we believe that we all learn from one another. You'll soon enough get the chance to give feedback on one of my PRs, which are seldom anywhere near perfect! Regards Stéfan

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Re: GSoC 2015 - Accepted Students
by Aman SIngh 06 May '15

06 May '15

Hi everyone, Firstly thanks for the welcome :) I have changed my blog address to acsgsoc15.wordpress.com If you can see it and give some suggestions, that would be very helpful. For future posts I will surely keep in mind the suggestions on blog writing. @Juan Thank-you. I will try my best to come up with your expectations. I am looking forward to working with you all...!!! Regards, Aman On Tue, May 5, 2015 at 12:50 PM, Juan Nunez-Iglesias <jni.soma(a)gmail.com> wrote: > Hi everyone, > > Thanks for the name drop Vighnesh! =) > > Welcome Aman and Daniil! I'm really looking forward to your contributions. > > Aman, as someone who's struggled, and failed, with the C backend of > ndimage, I'm particularly interested in your project! I'm looking forward > to seeing your work! > > As to writing, yes, good writing is a pet peeve of mine. It's tremendously > important, way more than hackers like us naturally realise. And it's > something that you can always improve. I'll post here something that > someone sent me recently as a critique on my writing: > http://designopen.org/articles/import-designers/ > > Read, in particular, the section under "The value of your project". As you > write your blog posts, don't just write a simple log of your activities. > Try to express the problems you faced and how you solved them, no matter > how trivial you think they are (e.g. "I stupidly forgot that dictionary > keys are unordered and it caused this bug but now it's fixed through this > PR that uses OrderedDict from the standard library"). And try to express > them in as broad a way as possible, for any programmer, not just people who > are familiar with SciPy internals (a rather small audience!). > > See you around! > > Juan. > > On Tue, May 5, 2015 at 6:23 AM, Stefan van der Walt <stefanv(a)berkeley.edu> > wrote: > >> On 2015-05-04 12:57:59, Даниил Пахомов <warmspringwinds(a)gmail.com> wrote: >> >>> Do you know whether it's possible to change my blog address? I >>> specified one address in my application and now I want to use another one. >>> >>> Just want to make it using markdown on github and make it so that anyone >>> can push changes in case they find a mistake. >>> >> >> If you create a repository myusername.github.io, you can publish a >> static blog there using Pelican. Or have a look at something like >> >> http://jekyllbootstrap.com/ >> >> 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/d/optout. >> > > -- > 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/d/optout. > -- Aman Singh Coordinator Programming Club Sophomore, Computer Science and Technology Indian Institute of Technology, Jodhpur

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Re: hough ellipse fit inaccurate?
by Arno Dietz 05 May '15

05 May '15

Ok sorry, maybe I need to explain my project better. I have a Autodesk Maya Model of a simplified eyeball with the pupil (see image). I render the images of the eyeball from different angles and try to detect the pupil center as accurate as possible. Since I know the geometry <http://www.dict.cc/englisch-deutsch/geometry.html> and rotation of the eyeball, I can calculate the mapping of the real center of the pupil on my virtual maya camera sensor. I proved the validity <http://www.dict.cc/englisch-deutsch/validity.html> of my calculation with several other methods of ellipse center detection (center of mass, distance transform, opencv ellipse fit, starbust) where I get errors between my calculation and measurement with sometimes less than 0.02 pixels. But nevertheless <http://www.dict.cc/englisch-deutsch/nevertheless.html> I want to try the hough ellipse approach, because it may be more robust against noise or other errors I want to simulate later. And it seems so far only the hough ellipse approach is quite inaccurate so I was wondering why. I think the reason could be the ellipse center detection has only a half pixel accuracy while my other approaches have sub-pixel accuracy. I think posting the calculation code would be too much, but I am quite sure the calculation is right. Kind regards Arno

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Re: GSoC 2015 - Accepted Students
by Stefan van der Walt 05 May '15

05 May '15

On 2015-05-04 12:57:59, Даниил Пахомов <warmspringwinds(a)gmail.com> wrote: > Do you know whether it's possible to change my blog address? I > specified one address in my application and now I want to use > another one. > > Just want to make it using markdown on github and make it so > that anyone can push changes in case they find a mistake. If you create a repository myusername.github.io, you can publish a static blog there using Pelican. Or have a look at something like http://jekyllbootstrap.com/ Stéfan

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