rcrespocano / opencv-python

Curso introducción a OpenCV y Python

opencv-python

Curso de introducción a OpenCV y Python.

opencv-python's Issues

Compatibility issue (cv2.cv.CV_HAAR_SCALE_IMAGE)

Ejemplo 16 and 17 return errors:

flags=cv2.cv.CV_HAAR_SCALE_IMAGE
# AttributeError: 'module' object has no attribute 'cv.CV_HAAR_SCALE_IMAGE'

For OpenCV 3.1 use this instead:

flags=cv2.CASCADE_SCALE_IMAGE

info: http://stackoverflow.com/questions/30013009/opencv-3-0-0-dev-python-bindings-not-working-properly

Añadir enlace tutorial de instalación windows

https://github.com/CAChemE/curso-opencv-python/blob/master/instalacion-opencv.md

Knearest compatibility error (OpenCV 3.1)

Again, some errors due to a series of refactoring operations made in the latest versions:

Ejemplo 22, line 25,26 and 27 crash:

knn = cv2.KNearest() # error
knn.train(trainData, responses)  # error
ret, results, neighbours, dist = knn.find_nearest(newcomer, k)  # error


---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-8-cfe065aacd5a> in <module>()
     23 # Classification
     24 k = 5
---> 25 knn = cv2.KNearest()
     26 knn.train(trainData, responses)
     27 ret, results, neighbours, dist = knn.find_nearest(newcomer, k)

AttributeError: module 'cv2' has no attribute 'KNearest'

This version works:

knn = cv2.ml.KNearest_create()
knn.train(trainData,cv2.ml.ROW_SAMPLE,responses)
ret, results, neighbours, dist = knn.findNearest(newcomer, k)

+info:
http://stackoverflow.com/a/30950853
http://stackoverflow.com/a/32990528
http://stackoverflow.com/a/34247966

kmeans argument missing

Website with documentation is wrong.

kmeans requires 6 arguments and not 5:

print(cv2.kmeans.__doc__)
# kmeans(data, K, bestLabels, criteria, attempts, flags[, centers]) -> retval, bestLabels, centers

Thus, ejemplo 23, line 22:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-13-af223fb327d3> in <module>()
     20 
     21 # Apply kmeans
---> 22 ret, label, center = cv2.kmeans(Z, K, criteria, attempts, cv2.KMEANS_RANDOM_CENTERS)
     23 
     24 # Now separate the data, Note the flatten()

TypeError: Required argument 'flags' (pos 6) not found

This will work:

ret, label, center = cv2.kmeans(Z, K, None, criteria, attempts, cv2.KMEANS_RANDOM_CENTERS)

Compatibilty Issue ORB

Ejemplo 21, line 83:

# Initiate ORB detector
orb = cv2.ORB()


---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-6-63fa69861ef0> in <module>()
     81 
     82 # Initiate ORB detector
---> 83 orb = cv2.ORB()
     84 
     85 # Find the keypoints and descriptors with ORB

AttributeError: module 'cv2' has no attribute 'ORB'

In OpenCV 3.x, this method has been renamed to:

orb = cv2.ORB_create()