An example of keypoint detection using SimpleCV.

keypoint.py

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')

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?