Profile

Cover photo
Stéfan van der Walt
Works at Stellenbosch University
Attended Stellenbosch University
Lives in Stellenbosch, South Africa
818 followers|105,695 views
AboutPostsPhotosYouTube

Stream

 
Pre-print of the scikit-image paper now available! https://peerj.com/preprints/336 #skimage #python
8
1
Pieter Van der Walt's profile photoMarianne Corvellec's profile photo
 
Great!
Add a comment...
 
If you don't like the way Python is implemented, why not simply rewrite it? 
8
Ondřej Čertík's profile photoStéfan van der Walt's profile photo
2 comments
Add a comment...

Stéfan van der Walt

Shared publicly  - 
 
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:

    http://scikit-image.org


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):

Segmentation:

- 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)

Other:

- 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.filter.denoise_tv_chambolle`,
  `skimage.morphology.is_local_maximum`, `skimage.transform.hough`,
  `skimage.transform.probabilistic_hough`,`skimage.transform.hough_peaks`.
  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
surname:

- 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
73
25
Alireza Seifi's profile photoNicholas Buse's profile photoHarald Schilly's profile photoJames Verster's profile photo
8 comments
 
Congrats to the scikit-image team!
Add a comment...

Stéfan van der Walt

Shared publicly  - 
 
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!
1
Add a comment...
 
Has anyone here used TaskWarrior?  How does it compare to other similar todo-list managers?
1
Paul Ivanov's profile photoCharl Botha's profile photoStéfan van der Walt's profile photo
4 comments
 
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. 
Add a comment...

Stéfan van der Walt

Shared publicly  - 
 
Kudos to gnome-tweak-tool author +John Stowers for hacking my Gnome 3 desktop back into shape!  Here are two tips for others:

1. https://extensions.gnome.org -- useful for all sorts of tweaks, including removing the annoying default grouped window switching behaviour.
2. The meta key (bound to the windows key by default) -- the new version of Alt-F2.  Also avoids the need to ever use the mouse to go to the menu.

And, of course, gnome-tweak-tool!
2
John Stowers's profile photoStéfan van der Walt's profile photoHugo van der Merwe's profile photo
7 comments
 
Yeah, I'm rediscovering what's bad about Unity. ;) Perhaps I'll try Gnome 3 next... but I'll limp along for the time being.
Add a comment...
In his circles
351 people
Have him in circles
818 people
Brigitte Janse van Rensburg's profile photo
Robert Kern's profile photo
 
Phenomenal run to Lake Lamar, Trentino
3
Stéfan van der Walt's profile photoHugo van der Merwe's profile photo
2 comments
 
All the "selfies" turned out to be pictures of Ghost Pirate Le Chuck's wily little brother. Perhaps in the next album :) 
Add a comment...
 
Blender demo reel 2013!

Blender Demo Reel 2013
9
2
Michael Hanke's profile photoCharl Botha's profile photoEric Floehr's profile photoStéfan van der Walt's profile photo
4 comments
Add a comment...

Stéfan van der Walt

Shared publicly  - 
5
Add a comment...
People
In his circles
351 people
Have him in circles
818 people
Brigitte Janse van Rensburg's profile photo
Robert Kern's profile photo
Education
  • Stellenbosch University
    PhD, Electronics Engineering, 2005 - 2010
Basic Information
Gender
Male
Work
Occupation
Lecturer / researcher
Employment
  • Stellenbosch University
    Lecturer / researcher, 2008 - present
  • University of California at Berkeley
    Postdoctoral researcher, 2011 - 2013
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Stellenbosch, South Africa
Previously
Oakland, California - Paarl, South Africa