49 lines
1.3 KiB
Python
49 lines
1.3 KiB
Python
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'''
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Multiscale Turing Patterns generator.
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Inspired by http://www.jonathanmccabe.com/Cyclic_Symmetric_Multi-Scale_Turing_Patterns.pdf
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'''
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import numpy as np
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import cv2, cv
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from common import draw_str
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w, h = 512, 512
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a = np.zeros((h, w, 1), np.float32)
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cv2.randu(a, np.array([0]), np.array([1]))
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a.shape = (h, w)
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def process_scale(a_lods, lod):
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d = a_lods[lod] - cv2.pyrUp(a_lods[lod+1])
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for i in xrange(lod):
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d = cv2.pyrUp(d)
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v = cv2.GaussianBlur(d*d, (3, 3), 0)
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return np.sign(d), v
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print 'Generating AVI file. Press ESC to stop.'
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out = cv2.VideoWriter('turing.avi', cv.CV_FOURCC(*'DIB '), 30.0, (w, h), False)
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scale_num = 6
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frame_num = 1000
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for frame_i in xrange(frame_num):
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a_lods = [a]
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for i in xrange(scale_num):
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a_lods.append(cv2.pyrDown(a_lods[-1]))
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ms, vs = [], []
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for i in xrange(1, scale_num):
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m, v = process_scale(a_lods, i)
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ms.append(m)
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vs.append(v)
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mi = np.argmin(vs, 0)
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a += np.choose(mi, ms) * 0.025
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a = (a-a.min()) / a.ptp()
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out.write(a)
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vis = a.copy()
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draw_str(vis, (20, 20), 'frame %d / %d' % (frame_i+1, frame_num))
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cv2.imshow('a', vis)
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if cv2.waitKey(5) == 27:
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break
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else:
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print 'done'
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cv2.waitKey()
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