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comparison python/cvutils.py @ 28:9ae709a2e8d0

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rearranged code
author Nicolas Saunier <nico@confins.net>
date Sat, 30 Jan 2010 21:42:53 -0500
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children be3ae926e4e8
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27:44689029a86f 28:9ae709a2e8d0
1 #! /usr/bin/env python
2 '''Image/Video utilities'''
3
4 import Image, ImageDraw # PIL
5 import aggdraw # agg on top of PIL (antialiased drawing)
6 from moving import Point
7 #import utils
8
9 __metaclass__ = type
10
11 def drawLines(filename, origins, destinations, w = 1, resultFilename='image.png'):
12 '''Draws lines over the image '''
13
14 img = Image.open(filename)
15
16 draw = ImageDraw.Draw(img)
17 #draw = aggdraw.Draw(img)
18 #pen = aggdraw.Pen("red", width)
19 for p1, p2 in zip(origins, destinations):
20 draw.line([p1.x, p1.y, p2.x, p2.y], width = w, fill = (256,0,0))
21 #draw.line([p1.x, p1.y, p2.x, p2.y], pen)
22 del draw
23
24 #out = utils.openCheck(resultFilename)
25 img.save(resultFilename)
26
27 def project(homography, p):
28 '''Returns the coordinates of the projection of the point p
29 through homography'''
30 from numpy.core._dotblas import dot
31 from numpy.core.multiarray import array
32 from numpy.lib.function_base import insert
33 if (homography!=None) and (len(homography)>0):
34 pAugmented = insert(array(p.aslist()), [2],[1], axis=0)
35 tmp = dot(homography, pAugmented)
36 return Point(tmp[0]/tmp[2], tmp[1]/tmp[2])
37 else:
38 return p
39
40 def projectTrajectory(homography, trajectory):
41 '''Projects a series of points in the format
42 [[x1, x2, ...],
43 [y1, y2, ...]]
44
45 Warning: not optimized, calls project()'''
46 projected = [[],[]]
47 for x, y in zip(trajectory[0], trajectory[1]):
48 p = [x,y]
49 pp = project(homography, p)
50 projected[0].append(pp[0])
51 projected[1].append(pp[1])
52 return projected
53