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Stéfan van der Walt
Works at Stellenbosch University
Attended Stellenbosch University
Lives in Stellenbosch, South Africa
840 followers|120,123 views


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+Ondřej Čertík It's the best publishing experience I've had.  The reviews were in on time, the editors were very responsive, the final proofing and markup correction was flawlessly executed.  So, yes, count me impressed!  I would definitely publish there again.

Actually, I have 5 PeerJ publishing vouchers valid for a month, if anyone is interested.
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Stéfan van der Walt

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Russian Lunar Lander Prototype Rediscovered | Part-Time Scientists
"An incredible piece of Apollo time space legacy has been rediscovered in a Russian hangar! It's the equivalent of the NASA Apollo program's lunar landing module." 

"From a historical and technical advancement point of view it's actually sad that Russia stopped it's efforts on sending people to the moon after the Apollo program turned out to be a success."

Lunniy Kabina  "lunar cabin" for a single cosmonaut.

Credit: Part-Time Scientists
Part-Time Scientists Website:
Part-Time Scientists Facebook Page:

+Part-Time Scientists 
+Roscosmos (Unofficial) 
+Johnson Space Center 
+NASA Goddard 
+NASA's Marshall Center 

#Space   #Russia   #Moon   #Lunar   #Lander #Soviet #LK #Spacecraft   #Cosmonaut   #Zond #Roscosmos #Apollo #NASA #ЛК #Россия
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Pre-print of the scikit-image paper now available! #skimage #python
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If you don't like the way Python is implemented, why not simply rewrite it? 
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Announcement: scikit-image 0.9.0

We're happy to announce the release of scikit-image v0.9.0!

scikit-image is an image processing toolbox for SciPy that includes algorithms
for segmentation, geometric transformations, color space manipulation,
analysis, filtering, morphology, feature detection, and more.

For more information, examples, and documentation, please visit our website:

New Features

`scikit-image` now runs without translation under both Python 2 and 3.

In addition to several bug fixes, speed improvements and examples, the 204 pull
requests merged for this release include the following new features (PR number
in brackets):


- 3D support in SLIC segmentation (#546)
- SLIC voxel spacing (#719)
- Generalized anisotropic spacing support for random_walker (#775)
- Yen threshold method (#686)

Transforms and filters:

- SART algorithm for tomography reconstruction (#584)
- Gabor filters (#371)
- Hough transform for ellipses (#597)
- Fast resampling of nD arrays (#511)
- Rotation axis center for Radon transforms with inverses. (#654)
- Reconstruction circle in inverse Radon transform (#567)
- Pixelwise image adjustment curves and methods (#505)

Feature detection:

- [experimental API] BRIEF feature descriptor (#591)
- [experimental API] Censure (STAR) Feature Detector (#668)
- Octagon structural element (#669)
- Add non rotation invariant uniform LBPs (#704)

Color and noise:

- Add deltaE color comparison and lab2lch conversion (#665)
- Isotropic denoising (#653)
- Generator to add various types of random noise to images (#625)
- Color deconvolution for immunohistochemical images (#441)
- Color label visualization (#485)

Drawing and visualization:

- Wu's anti-aliased circle, line, bezier curve (#709)
- Linked image viewers and docked plugins (#575)
- Rotated ellipse + bezier curve drawing (#510)
- PySide & PyQt4 compatibility in skimage-viewer (#551)


- Python 3 support without 2to3. (#620)
- 3D Marching Cubes (#469)
- Line, Circle, Ellipse total least squares fitting and RANSAC algorithm (#440)
- N-dimensional array padding (#577)
- Add a wrapper around `scipy.ndimage.gaussian_filter` with useful default behaviors. (#712)
- Predefined structuring elements for 3D morphology (#484)

API changes

The following backward-incompatible API changes were made between 0.8 and 0.9:

- No longer wrap ``imread`` output in an ``Image`` class
- Change default value of `sigma` parameter in ``skimage.segmentation.slic``
  to 0
- ``hough_circle`` now returns a stack of arrays that are the same size as the
  input image. Set the ``full_output`` flag to True for the old behavior.
- The following functions were deprecated over two releases:
  `skimage.morphology.is_local_maximum`, `skimage.transform.hough`,
  Their functionality still exists, but under different names.

Contributors to this release

This release was made possible by the collaborative efforts of many
contributors, both new and old.  They are listed in alphabetical order by

- Ankit Agrawal
- K.-Michael Aye
- Chris Beaumont
- François Boulogne
- Luis Pedro Coelho
- Marianne Corvellec
- Olivier Debeir
- Ferdinand Deger
- Kemal Eren
- Jostein Bø Fløystad
- Christoph Gohlke
- Emmanuelle Gouillart
- Christian Horea
- Thouis (Ray) Jones
- Almar Klein
- Xavier Moles Lopez
- Alexis Mignon
- Juan Nunez-Iglesias
- Zachary Pincus
- Nicolas Pinto
- Davin Potts
- Malcolm Reynolds
- Umesh Sharma
- Johannes Schönberger
- Chintak Sheth
- Kirill Shklovsky
- Steven Silvester
- Matt Terry
- Riaan van den Dool
- Stéfan van der Walt
- Josh Warner
- Adam Wisniewski
- Yang Zetian
- Tony S Yu
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Congrats to the scikit-image team!
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Stéfan van der Walt

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The Rembrandt museum in Amsterdam was one of my favorites. I'm not educated in the arts, but the moods in this man's work move me beyond words.
Lovely Google Doodle again today! Keep 'em coming!
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Has anyone here used TaskWarrior?  How does it compare to other similar todo-list managers?
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I believe you, Paul! When grading papers, it's often hard to see the forest for the trees, though. Let's call it a game of life and sanity. 
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Have him in circles
840 people
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Stéfan van der Walt

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Over the last year I've worked with some awesome folks (+Kester Tong  +Mark Sandler, +Corinna Cortes , +Matthew Turk,  +Gideon Mann  +Arnaud Sahuguet, +Adam Berenzweig) to understand how people collaborate on data analysis and to build better tools to support them. Yesterday, with the help of +Fernando Perez and +Wes McKinney we revealed this work at PyCon APAC.

We've created an interactive, collaborative analytics tool by integrating Google Docs, Chrome, and IPython. You can open a notebook from Drive. You can share notebooks like you would share a Google Doc. You can comment and edit collaboratively, in realtime. There is zero setup, because all the computation happens in Chrome. You can even quickly and easily package your analytics pipeline into a GUI for folks that don't want to program. In effect, you can go from zero to analytics with little impedance.  

What's even better is that you can build on our work. It will all be open source on top of public Google APIs. We'll have a larger Google Research blog post about this work when we release the code and the Chrome application.
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Following the progress on this integration. Great effort.
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Stéfan van der Walt

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"Look for the spark, look for the light."
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Phenomenal run to Lake Lamar, Trentino
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All the "selfies" turned out to be pictures of Ghost Pirate Le Chuck's wily little brother. Perhaps in the next album :) 
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Blender demo reel 2013!

Blender Demo Reel 2013
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Have him in circles
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  • Stellenbosch University
    PhD, Electronics Engineering, 2005 - 2010
Basic Information
Lecturer / researcher
  • Stellenbosch University
    Lecturer / researcher, 2008 - present
  • University of California at Berkeley
    Postdoctoral researcher, 2011 - 2013
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Stellenbosch, South Africa
Oakland, California - Paarl, South Africa