libvips/test/test_morphology.py

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2015-01-28 22:29:06 +01:00
#!/usr/bin/python
import unittest
import math
#import logging
#logging.basicConfig(level = logging.DEBUG)
from gi.repository import Vips
Vips.leak_set(True)
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# an expanding zip ... if either of the args is a scalar or a one-element list,
# duplicate it down the other side
def zip_expand(x, y):
# handle singleton list case
if isinstance(x, list) and len(x) == 1:
x = x[0]
if isinstance(y, list) and len(y) == 1:
y = y[0]
if isinstance(x, list) and isinstance(y, list):
return list(zip(x, y))
elif isinstance(x, list):
return [[i, y] for i in x]
elif isinstance(y, list):
return [[x, j] for j in y]
else:
return [[x, y]]
class TestMorphology(unittest.TestCase):
# test a pair of things which can be lists for approx. equality
def assertAlmostEqualObjects(self, a, b, places = 4, msg = ''):
# print 'assertAlmostEqualObjects %s = %s' % (a, b)
for x, y in zip_expand(a, b):
self.assertAlmostEqual(x, y, places = places, msg = msg)
def test_countlines(self):
im = Vips.Image.black(100, 100)
im = im.draw_line(255, 0, 50, 100, 50)
n_lines = im.countlines(Vips.Direction.HORIZONTAL)
self.assertEqual(n_lines, 1)
def test_labelregions(self):
im = Vips.Image.black(100, 100)
im = im.draw_circle(255, 50, 50, 25, fill = True)
mask, opts = im.labelregions(segments = True)
self.assertEqual(opts['segments'], 3)
self.assertEqual(mask.max(), 2)
def test_erode(self):
im = Vips.Image.black(100, 100)
im = im.draw_circle(255, 50, 50, 25, fill = True)
im2 = im.erode([[128, 255, 128],
[255, 255, 255],
[128, 255, 128]])
self.assertEqual(im.width, im2.width)
self.assertEqual(im.height, im2.height)
self.assertEqual(im.bands, im2.bands)
self.assertTrue(im.avg() > im2.avg())
def test_dilate(self):
im = Vips.Image.black(100, 100)
im = im.draw_circle(255, 50, 50, 25, fill = True)
im2 = im.dilate([[128, 255, 128],
[255, 255, 255],
[128, 255, 128]])
self.assertEqual(im.width, im2.width)
self.assertEqual(im.height, im2.height)
self.assertEqual(im.bands, im2.bands)
self.assertTrue(im2.avg() > im.avg())
def test_rank(self):
im = Vips.Image.black(100, 100)
im = im.draw_circle(255, 50, 50, 25, fill = True)
im2 = im.rank(3, 3, 8)
self.assertEqual(im.width, im2.width)
self.assertEqual(im.height, im2.height)
self.assertEqual(im.bands, im2.bands)
self.assertTrue(im2.avg() > im.avg())
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if __name__ == '__main__':
unittest.main()