Hi there,I'm currently extending the Python wrapper for the Open Computer Vision Library (opencv) with the goal to interface numerical libraries as seemless as possible. Unfortunately, it doesn't seem to be that easy ;-)
What I've done so far:- Added an __array_interface__ property to the Python side of OpenCV data structures (matrices and images) that uses version 3 of the interface definition and supplies the keys 'version', 'shape', 'typestr', 'data' and in some cases 'strides' when we have non- continuos memory layout. I think, I'm compatible to http://numpy.scipy.org/array_interface.shtml . - Added parsing the __array_interface__ of Python objects passed to OpenCV methods. I'm a bit unsure of how to use the C/C++ side (array struct) and if I can expect it to be there (for example: I don't provide one with OpenCV). Since I intend to keep OpenCV independent of numpy, calling functions from numpy.h is not an option, as far as I can see.
The stuff described above is in the head revision of OpenCV, accessible via "svn co https://opencvlibrary.svn.sourceforge.net/svnroot/opencvlibrary/trunk/opencv ".
I've tried using the following packages with OpenCV this way:- numpy (1.0.4): everything works as expected. This is the most important library for OpenCV users, so this is a good sign. - pylab/matplotlib (0.91.2): seems to use numpy / scipy-core. Everything okay. - PIL (1.1.6): the array interface (Python side) doesn't adhere to the definition -> no 'version' key, 'data' is string, not a tuple holding the pointer. What to do with this? - Numeric (24.2): I can create arrays from OpenCV datatypes and print them. Converting to other types however always yields 'Cannot convert scalar to float' or 'a float is required'. Strange :-/ Numeric.array instances also don't carry an __array_interface__. I can however convert by using numpy.arrays as intermediate step.
- Gnuplot (1.7): uses Numeric, so doesn't work as well- pymat: didn't check. Seems to use Numeric, test results cover Numeric 23 and Matlab 6.5 only, so this package might be dead?
- numarray: didn't check. Is there still any relevance of this package? Best, Mark -- Mark Asbach Institut für Nachrichtentechnik, RWTH Aachen University http://www.ient.rwth-aachen.de/cms/team/m_asbach
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