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test_morphology.py
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test_morphology.py
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# vim: set fileencoding=utf-8 :
import unittest
import pyvips
from .helpers import PyvipsTester
class TestMorphology(PyvipsTester):
def test_countlines(self):
im = pyvips.Image.black(100, 100)
im = im.draw_line(255, 0, 50, 100, 50)
n_lines = im.countlines(pyvips.Direction.HORIZONTAL)
self.assertEqual(n_lines, 1)
def test_labelregions(self):
im = pyvips.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 = pyvips.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 = pyvips.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 = pyvips.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())
if __name__ == '__main__':
unittest.main()