small image

[twmht]

Have some problems when testing following images

Traceback (most recent call last):
  File "headpose.py", line 237, in <module>
    main(args)
  File "headpose.py", line 206, in main
    res, angles = hpd.process_image(image)
  File "headpose.py", line 191, in process_image
    im = annotator.draw_all()
  File "/home/tumh/Headpose-Detection/utils.py", line 48, in draw_all
    self.draw_axes()
  File "/home/tumh/Headpose-Detection/utils.py", line 82, in draw_axes
    cv2.line(self.im, p1, p2, Color.blue, self.ls)
cv2.error: OpenCV(3.4.3) /io/opencv/modules/imgproc/src/drawing.cpp:1811: error: (-215:Assertion failed) 0 < thickness && thickness <= MAX_THICKNESS in function 'line'