Bugs in Hough line detection - examples of CV_HOUGH_PROBABILISTIC failures

It appears there is a major bug in the probabalistic hough line 
detection algorithm/code.  I'm using the hough example app from the 
documentation (opencvref_cv.htm).  

Running:

lines = cvHoughLines2( dst, storage, CV_HOUGH_PROBABILISTIC, 1, 
CV_PI/180, 80, 30, 10 );

on the example image from the documentation: 
http://www.vizzion.com/images/test2.jpg

Gives: http://www.vizzion.com/images/test2result.jpg

i.e. nothing like the result shown in the documentation - many lines 
missing, and lots of incorrect lines radiating from the top left 
corner of the image.

The problem is even more apparent when running:

lines = cvHoughLines2( dst, storage, CV_HOUGH_PROBABILISTIC, 1, 
CV_PI/180, 10, 10, 10 )

On this 'ideal' test image:  http://www.vizzion.com/images/test1.bmp

Which gives this result:  
http://www.vizzion.com/images/test1result.jpg

i.e. some lines not detected, some lines incomplete, one line at a 
slightly wrong angle.

Does anyone get the same poor results on these test images?  

Chris















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