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An example of keypoint detection using SimpleCV.
from SimpleCV import Image, Color, Display
# load an image from imgur
img = Image('http://i.imgur.com/lfAeZ4n.png')
# use a keypoint detector to find areas of interest
feats = img.findKeypoints()
# draw the list of keypoints
feats.draw(color=Color.RED)
# show the resulting image.
img.show()
# apply the stuff we found to the image.
output = img.applyLayers()
# save the results.
output.save('juniperfeats.png')
@muroshi
muroshi commented May 25, 2014

I receive:
Fatal Python error: (pygame parachute) Segmentation Fault [Finished in 1.2s with exit code -6]

@tyoc213
tyoc213 commented Jun 30, 2014
TypeError                                 Traceback (most recent call last)
C:\Python27\lib\site-packages\SimpleCV\Shell\Shell.pyc in <module>()
      3 img = Image('http://i.imgur.com/lfAeZ4n.png')
      4 # use a keypoint detector to find areas of interest
----> 5 feats = img.findKeypoints()
      6 # draw the list of keypoints
      7 feats.draw(color=Color.RED)

C:\Python27\lib\site-packages\SimpleCV\ImageClass.pyc in findKeypoints(self, min_quality, flavor, highQuality)
   7748             kp,d = self._getRawKeypoints(thresh=min_quality,forceReset=True,flavor=flavor,highQuality=1)
   7749         else:
-> 7750             kp,d = self._getRawKeypoints(thresh=min_quality,forceReset=True,flavor=flavor,highQuality=0)
   7751
   7752         if( flavor in ["ORB", "SIFT", "SURF"]  and kp!=None and d !=None ):

C:\Python27\lib\site-packages\SimpleCV\ImageClass.pyc in _getRawKeypoints(self, thresh, flavor, highQuality, forceReset)
   7344                     #mask = self.getGrayNumpy()
   7345                     #mask.fill(255)
-> 7346                     self._mKeyPoints,self._mKPDescriptors = surfer.detect(self.getGrayNumpy(),None,useProvidedKeypoints = False)
   7347                     if( len(self._mKPDescriptors) == 0 ):
   7348                         return None, None

TypeError: FeatureDetector.detect() takes at most 2 arguments (3 given)
@cletrix
cletrix commented Nov 7, 2014

I receive too:

TypeError: FeatureDetector.detect() takes at most 2 arguments (3 given)

If someone has any ideas please post here , thanks.

@sodle
sodle commented Jan 12, 2016

I receive:

ERROR: 
Traceback (most recent call last):
  File "canny_example.py", line 5, in <module>
    feats = img.findKeypoints()
  File "/usr/lib/python2.7/site-packages/SimpleCV/ImageClass.py", line 7750, in findKeypoints
    kp,d = self._getRawKeypoints(thresh=min_quality,forceReset=True,flavor=flavor,highQuality=0)
  File "/usr/lib/python2.7/site-packages/SimpleCV/ImageClass.py", line 7343, in _getRawKeypoints
    surfer = cv2.SURF(hessianThreshold=thresh,extended=highQuality,upright=1)
AttributeError: 'module' object has no attribute 'SURF'
@wilkic
wilkic commented Jul 10, 2016

On line5: feats = img.findKeypoints() I get a seg fault:

Using ipdb, I've traced it down to
/usr/local/lib/python2.7/dist-packages/SimpleCV/ImageClass.py(1942)getGrayNumpy() 1941 -> 1942 return self._grayNumpy

which then yields:
Fatal Python error: (pygame parachute) Segmentation Fault Aborted (core dumped)

The numpy array looked fine prior to returning it, so not sure why it faulted. Has anyone else encountered this before?

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