fourierDescriptor(): Assertion failed fourier_descriptors.cpp, line 214 #87
Description
Expected behaviour
Return some sequence of fourier descriptors from input values, hopefully from a rank 2 numpy array. Many thanks for any pointers, help greatly appreciated!
Actual behaviour
It throws {error}/io/opencv_contrib/modules/ximgproc/src/fourier_descriptors.cpp:214: error: (-215) _src.empty() || (_src.channels() == 2 && (_src.depth() == 4 || _src.depth() == 5 || _src.depth() == 6)) in function fourierDescriptor
It's unclear how to use this function, I can't find documentation on its intended use. I suspect it has something to do with _src.channels() and _src.depth() but how to leverage these...?
Steps to reproduce
On ubuntu 16.04:
pip3 install opencv-contrib-python
opencv-contrib-python in ./venv/lib/python3.5/site-packages (3.4.0.12)
from cv2.ximgproc import fourierDescriptor
-
Feeding some dummy values:
fourierDescriptor([12, 11])
{TypeError}src is not a numpy array, neither a scalar
Fair enough... -
Feeding a scalar:
fourierDescriptor(12)
{error}/io/opencv_contrib/modules/ximgproc/src/fourier_descriptors.cpp:214: error: (-215) _src.empty() || (_src.channels() == 2 && (_src.depth() == 4 || _src.depth() == 5 || _src.depth() == 6)) in function fourierDescriptor -
Feeding a rank 1 numpy array:
fourierDescriptor(np.array([12]))
{error}/io/opencv_contrib/modules/ximgproc/src/fourier_descriptors.cpp:214: error: (-215) _src.empty() || (_src.channels() == 2 && (_src.depth() == 4 || _src.depth() == 5 || _src.depth() == 6)) in function fourierDescriptor -
Feeding a rank 2 numpy array:
fourierDescriptor(np.array([[12, 11], [10, 9]]))
{error}/io/opencv_contrib/modules/ximgproc/src/fourier_descriptors.cpp:214: error: (-215) _src.empty() || (_src.channels() == 2 && (_src.depth() == 4 || _src.depth() == 5 || _src.depth() == 6)) in function fourierDescriptor