Mailman 3 February 2014 - scikit-image

scikit-image installation
by VIKAS KUMAR Feb. 20, 2014

Feb. 20, 2014

when i m installing scikit-image package it gives me ERROR ------------------------- File "setup.py", line 37, in <module> from numpy.distutils.core import setup File "/usr/lib/python2.7/dist-packages/numpy/__init__.py", line 137, in <module> import add_newdocs File "/usr/lib/python2.7/dist-packages/numpy/add_newdocs.py", line 9, in <module> from numpy.lib import add_newdoc File "/usr/lib/python2.7/dist-packages/numpy/lib/__init__.py", line 13, in <module> from polynomial import * File "/usr/lib/python2.7/dist-packages/numpy/lib/polynomial.py", line 17, in <module> from numpy.linalg import eigvals, lstsq File "/usr/lib/python2.7/dist-packages/numpy/linalg/__init__.py", line 48, in <module> from linalg import * File "/usr/lib/python2.7/dist-packages/numpy/linalg/linalg.py", line 23, in <module> from numpy.linalg import lapack_lite ImportError: /usr/lib/liblapack.so.3gf: undefined symbol: ATL_chemv

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Re: Digitization errors in small circles
by Adam Hughes Feb. 20, 2014

Feb. 20, 2014

Thanks Juan. Ya I had read that, sorry to make you post the source link. I guess I just wanted to confirm that what I was seeing made sense and was a product of the drawing routine rather than some sort of error or misinterpretation. On Monday, February 17, 2014 9:32:20 PM UTC-5, Juan Nunez-Iglesias wrote: > > Adam, > > > On Tue, Feb 18, 2014 at 12:40 PM, Adam Hughes <hughes...(a)gmail.com<javascript:> > > wrote: > >> would you know which *perimeter* of the methods you listed would be >> returned by region_props? >> > > The region_props documentation describes it pretty well: > > **perimeter** : float > Perimeter of object which approximates the contour as a line > through the centers of border pixels using a 4-connectivity. > > Nothing is more precise than code though: > > https://github.com/scikit-image/scikit-image/blob/master/skimage/measure/_r… > > Maybe this is not the right way to do it. As you mentioned, circularity > should probably converge to 1. > > Juan. >

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Re: Google Summer of Code 2014
by Sharath T S Feb. 19, 2014

Feb. 19, 2014

Hi Stefan, I was looking the project on text detection up on GSOC this year. I'm immensely interested in the field of machine learning and computer vision. I recently completed a course on machine learning on coursera offered by the stanford university. I just wanted to know what the pre requisites are for this text detection project, i.e., what I should know before I can start reading the papers on Real-time scene text localization and recognition and also the one on stroke width transformation. Thanks in advance,<http://cmp.felk.cvut.cz/%7Eneumalu1/neumann-cvpr2012.pdf> Sharath <http://cmp.felk.cvut.cz/%7Eneumalu1/neumann-cvpr2012.pdf>

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Re: Google Summer of Code 2014
by Stéfan van der Walt Feb. 18, 2014

Feb. 18, 2014

On Tue, Feb 18, 2014 at 7:18 PM, abid rahman <abidrahman2(a)gmail.com> wrote: > 1. Yes it is patented. That rules out SWT then. Let's look at all the alternatives available and update the proposal accordingly. > 2 - Regarding SIMD optimization : Is there any particular reason for less > number of SIMD optimized functions? Other libraries seems to spend a lot of > time on this. Mainly, we've been picking our battles. But any attention in that area is welcome. Stéfan

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Re: Google Summer of Code 2014
by abid rahman Feb. 18, 2014

Feb. 18, 2014

Hi Stefan, 1 - I just contacted *Eyal Ofek* from Microsoft Research, one of the authors of that SWT paper. *My mail :* *I am Abid K, a graduate student from India. I have some questions regarding your paper "Detecting Text in Natural Scenes with Stroke Width Transform". 1 - Is it patented? 2 - Can I implement it myself and contribute it to some Open Source image processing libraries like scikit-image, OpenCV etc?* *Reply from Eyal* 1. Yes it is patented. 2. I believe there are implementations of SWT or a derivative out there. *And on asking more details on second question, he replied:* Your quest6ion is legal, and I cannot answer that - I'll send it to the people that deals with patents. 2 - Regarding SIMD optimization : Is there any particular reason for less number of SIMD optimized functions? Other libraries seems to spend a lot of time on this. Regards Abid K. On Tue, Feb 18, 2014 at 9:34 PM, Stéfan van der Walt <stefan(a)sun.ac.za>wrote: > On Tue, Feb 18, 2014 at 5:53 PM, abid rahman <abidrahman2(a)gmail.com> > wrote: > > So I think SWT is patented, isn't it? > > I'm not sure--I would like to contact the researchers in Microsoft to > get clarity (or perhaps someone would volunteer to do so?) > > > I wonder if implementation of this paper is considered to be a GSoC > project, > > I would like to work on it. > > I think so--the goal is text detection, not to implement any specific > algorithm (I updated the project description to include this paper). > > > Another question : What is the status of SIMD optimization in > scikit-image? > > Does Cython support such kind of optimization works? Is there any SIMD > > optimized functions available in scikit-image? > > These are the only vectorized ops we have: > > > https://github.com/scikit-image/scikit-image/blob/master/skimage/_shared/ve… > > 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. >

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Re: Google Summer of Code 2014
by Stéfan van der Walt Feb. 18, 2014

Feb. 18, 2014

On Tue, Feb 18, 2014 at 5:53 PM, abid rahman <abidrahman2(a)gmail.com> wrote: > So I think SWT is patented, isn't it? I'm not sure--I would like to contact the researchers in Microsoft to get clarity (or perhaps someone would volunteer to do so?) > I wonder if implementation of this paper is considered to be a GSoC project, > I would like to work on it. I think so--the goal is text detection, not to implement any specific algorithm (I updated the project description to include this paper). > Another question : What is the status of SIMD optimization in scikit-image? > Does Cython support such kind of optimization works? Is there any SIMD > optimized functions available in scikit-image? These are the only vectorized ops we have: https://github.com/scikit-image/scikit-image/blob/master/skimage/_shared/ve… Stéfan

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Re: Google Summer of Code 2014
by abid rahman Feb. 18, 2014

Feb. 18, 2014

Hi Stefan, So I think SWT is patented, isn't it? That looks fantastic--algorithms such as these are exactly what I had in > mind. > I wonder if implementation of this paper is considered to be a GSoC project, I would like to work on it. *Another question* : What is the status of SIMD optimization in scikit-image? Does Cython support such kind of optimization works? Is there any SIMD optimized functions available in scikit-image? Regards Abid K

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Re: Google Summer of Code 2014
by Stéfan van der Walt Feb. 18, 2014

Feb. 18, 2014

On Tue, Feb 18, 2014 at 6:15 AM, abid rahman <abidrahman2(a)gmail.com> wrote: > And I think that may be the reason OpenCV went after another (newer - CVPR > 2012) algorithm for same : > http://cmp.felk.cvut.cz/~neumalu1/neumann-cvpr2012.pdf That looks fantastic--algorithms such as these are exactly what I had in mind. Stéfan

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Re: Face detection
by Vasanth Kalingeri Feb. 18, 2014

Feb. 18, 2014

Hi Stéfan, I am a computer science undergrad, presently in my second year and extremely interested in machine learning and computer vision. I found the project that you mentioned, here <https://github.com/scikit-image/scikit-image/wiki/GSoC-2014>and I find it to be really interesting to work on. I have used the haar classifier for detecting faces(mostly as a black box) and I would like to understand its working so that I can work on this project, can you please let me know how I start with this? Any good algorithms in recent research papers that I have to read? or any essential prerequisites for the project? Thanks a lot in advance. Vasanth Kalingeri On Thursday, March 28, 2013 3:05:31 PM UTC+5:30, Stefan van der Walt wrote: > > Hi everyone > > I've been interested in getting face detection into skimage for a > while. This morning, Nathan Faggian reminded me that the highly > popular Viola-Jones detector is patent encumbered (yes, if you're not > careful you can use patented code in packages like OpenCV). However, > the following link seems to suggest that we can work around that by > training our own classifier with different features: > > > http://rafaelmizrahi.blogspot.com/2007/02/intel-opencv-face-detection-licen… > > If there's any interest in working on this, or if you already have an > algorithm available, please get in touch. > > Stéfan >

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Re: Google Summer of Code 2014
by abid rahman Feb. 18, 2014

Feb. 18, 2014

Hi Stefan, Here is *one link of patent application* I just found out (I am not sure if it is proof for whether it is patented. I don't know much about patents, but I think you will understand it) : http://www.faqs.org/patents/app/20090285482 Long back, I have seen a video its author presenting SWT in a conference, and a question came from audiance about its source code, He replied "come to Microsoft, you will get the code". "Otherwise?", "It is not upto me" Please *watch last one minute of this video* : http://videolectures.net/cvpr2010_epshtein_dtns/ Some two years back, when I first saw this paper, I had a plan to implement it (and contribute to OpenCV actually). So while gathering more information about this, I saw this video, and I assumed it is patented and OpenCV won't take it. So left the plan there. And I think that may be the reason *OpenCV went after another (newer - CVPR 2012) algorithm for same* : http://cmp.felk.cvut.cz/~neumalu1/neumann-cvpr2012.pdf Regards Abid K. On Mon, Feb 17, 2014 at 7:22 PM, Stéfan van der Walt <stefan(a)sun.ac.za>wrote: > Hi Abid > > On Sun, Feb 16, 2014 at 5:58 PM, abid rahman <abidrahman2(a)gmail.com> > wrote: > > One question. Isn't stroke width transform patented by microsoft > research? > > I haven't seen any indication that it is; could you provide me with a > reference? > > 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. >

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