Add Theia to users.
Change-Id: Ic112d31e2b8d7ecd28816fdc76e27adb1da27ac5
diff --git a/docs/source/users.rst b/docs/source/users.rst
index ed54f8b..f198008 100644
--- a/docs/source/users.rst
+++ b/docs/source/users.rst
@@ -44,6 +44,10 @@
* Camera/depth sensors network calibration.
* Depth sensor distortion map estimation.
+* `Theia <http://cs.ucsb.edu/~cmsweeney/theia>`_ is an open source
+ Structure from Motion library that uses Ceres for `bundle adjustment`_
+ and camera pose estimation.
+
.. _bundle adjustment: http://en.wikipedia.org/wiki/Structure_from_motion
.. _Street View: http://youtu.be/z00ORu4bU-A
.. _PhotoTours: http://google-latlong.blogspot.com/2012/04/visit-global-landmarks-with-photo-tours.html
