1 """Imago grid-fitting module"""
5 import Image, ImageDraw, ImageFilter
7 from geometry import V, projection
8 from manual import lines as g_grid, l2ad
9 from intrsc import intersections_from_angl_dist
10 from linef import line_from_angl_dist
13 class GridFittingFailedError(Exception):
16 class MyGaussianBlur(ImageFilter.Filter):
19 def __init__(self, radius=2):
21 def filter(self, image):
22 return image.gaussian_blur(self.radius)
25 X, Y, im_l, a, b, c, d, s, v1, v2, k, hough, size = args
26 return [(distance(im_l,
27 get_grid(a + X[y] * s * v1,
30 size), a + X[y] * s * v1, b + Y[y] * s * v1) for y in range(2 *k)]
33 X, Y, im_l, a, b, c, d, s, v1, v2, k, hough, size = args
34 return [(distance(im_l,
35 get_grid(a, b, c + X[y] * s * v2,
38 size), c + X[y] * s * v2, d + Y[y] * s * v2) for y in range(2 *k)]
40 def find(lines, size, l1, l2, bounds, hough, do_something, im_h):
41 a, b, c, d = [V(*a) for a in bounds]
42 l1 = line_from_angl_dist(l1, size)
43 l2 = line_from_angl_dist(l2, size)
44 v1 = V(*l1[0]) - V(*l1[1])
45 v2 = V(*l2[0]) - V(*l2[1])
46 a = projection(a, l1, v1)
47 b = projection(b, l1, v1)
48 c = projection(c, l2, v2)
49 d = projection(d, l2, v2)
51 im_l = Image.new('L', size)
52 dr_l = ImageDraw.Draw(im_l)
53 for line in sum(lines, []):
54 dr_l.line(line_from_angl_dist(line, size), width=1, fill=255)
56 #im_l = im_h #hocus pocus
57 im_l = im_l.filter(MyGaussianBlur(radius=2))
58 #GaussianBlur is undocumented class, may not work in future versions of PIL
59 im_l_s = im_l.tostring()
61 #from gridf_analyzer import error_surface
62 #error_surface(im_l, a, b, c, d, hough, size, v1 ,v2)
64 grid = get_grid(a, b, c, d, hough, size)
66 #let's try the bruteforce aproach:
70 for i in range(-k, k):
71 X.append(range(-k, k))
74 pool = multiprocessing.Pool(None)
76 tasks = [(X[x], Y[x], im_l_s, a, b, c, d, s,
77 v1, v2, k, hough, size) for x in xrange(0, 2 * k)]
81 opt_ab = pool.map(job_br1, tasks, 1)
82 opt_cd = pool.map(job_br2, tasks, 1)
95 print time.time() - start
96 grid = get_grid(a, b, c, d, hough, size)
97 grid_lines = [[l2ad(l, size) for l in grid[0]],
98 [l2ad(l, size) for l in grid[1]]]
102 im_t = Image.new('RGB', im_l.size, None)
105 for x in xrange(im_t.size[0]):
106 for y in xrange(im_t.size[1]):
107 im_t_l[x, y] = (im_l_l[x, y], 0, 0)
109 #im_t_d = ImageDraw.Draw(im_t)
110 #for l in grid[0] + grid[1]:
111 # im_t_d.line(l, width=1, fill=(0, 255, 0))
113 #do_something(im_t, "lines and grid")
118 return grid, grid_lines
120 def get_grid(a, b, c, d, hough, size):
121 l1 = hough.lines_from_list([a, b])
122 l2 = hough.lines_from_list([c, d])
123 c = intersections_from_angl_dist([l1, l2], size, get_all=True)
124 #TODO do something when a corner is outside the image
125 corners = (c[0] + c[1])
128 raise GridFittingFailedError
129 grid = g_grid(corners)
132 def line_out(line, size):
134 if p[0] < 0 or p[0] > size[0] or p[1] < 0 or p[1] > size[1]:
139 def distance(im_l, grid, size):
140 im_g = Image.new('L', size)
141 dr_g = ImageDraw.Draw(im_g)
142 for line in grid[0] + grid[1]:
143 dr_g.line(line, width=1, fill=255)
144 if line_out(line, size):
146 #im_g = im_g.filter(MyGaussianBlur(radius=3))
147 #GaussianBlur is undocumented class, may not work in future versions of PIL
148 #im_d, distance = combine(im_l, im_g)
149 distance_d = pcf.combine(im_l, im_g.tostring())