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I just double-checked and HoughLinesP works fine for me. Can you double-check that thresh is of the correct format, i.e.:
print threshd.shape, thresh.dtype
should give you sth like:
((600, 868), dtype('uint8'))
If you get sth like (600,868,3) would indicate that you haven't converted the image correctly to a single channel. However, I guess your type is wrong, maybe due to the filtering process before.