4 Multiscale Turing Patterns generator
5 ====================================
7 Inspired by http://www.jonathanmccabe.com/Cyclic_Symmetric_Multi-Scale_Turing_Patterns.pdf
12 from common import draw_str
14 from itertools import count
17 USAGE: turing.py [-o <output.avi>]
22 if __name__ == '__main__':
27 args, args_list = getopt.getopt(sys.argv[1:], 'o:', [])
32 out = cv2.VideoWriter(args['-o'], cv2.VideoWriter_fourcc(*'DIB '), 30.0, (w, h), False)
33 print 'writing %s ...' % fn
35 a = np.zeros((h, w), np.float32)
36 cv2.randu(a, np.array([0]), np.array([1]))
38 def process_scale(a_lods, lod):
39 d = a_lods[lod] - cv2.pyrUp(a_lods[lod+1])
42 v = cv2.GaussianBlur(d*d, (3, 3), 0)
46 for frame_i in count():
48 for i in xrange(scale_num):
49 a_lods.append(cv2.pyrDown(a_lods[-1]))
51 for i in xrange(1, scale_num):
52 m, v = process_scale(a_lods, i)
56 a += np.choose(mi, ms) * 0.025
57 a = (a-a.min()) / a.ptp()
62 draw_str(vis, (20, 20), 'frame %d' % frame_i)
64 if 0xFF & cv2.waitKey(5) == 27:
66 cv2.destroyAllWindows()