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182 lines
6.4 KiB
Python
182 lines
6.4 KiB
Python
# Test the ImageMorphology functionality
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from helper import unittest, PillowTestCase, hopper
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from PIL import Image
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from PIL import ImageMorph
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class MorphTests(PillowTestCase):
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def setUp(self):
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self.A = self.string_to_img(
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"""
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.......
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.......
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..111..
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..111..
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..111..
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.......
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.......
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"""
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)
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def img_to_string(self, im):
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"""Turn a (small) binary image into a string representation"""
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chars = '.1'
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width, height = im.size
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return '\n'.join(
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''.join(chars[im.getpixel((c, r)) > 0] for c in range(width))
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for r in range(height))
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def string_to_img(self, image_string):
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"""Turn a string image representation into a binary image"""
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rows = [s for s in image_string.replace(' ', '').split('\n')
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if len(s)]
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height = len(rows)
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width = len(rows[0])
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im = Image.new('L', (width, height))
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for i in range(width):
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for j in range(height):
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c = rows[j][i]
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v = c in 'X1'
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im.putpixel((i, j), v)
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return im
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def img_string_normalize(self, im):
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return self.img_to_string(self.string_to_img(im))
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def assert_img_equal(self, A, B):
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self.assertEqual(self.img_to_string(A), self.img_to_string(B))
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def assert_img_equal_img_string(self, A, Bstring):
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self.assertEqual(
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self.img_to_string(A),
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self.img_string_normalize(Bstring))
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def test_str_to_img(self):
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im = Image.open('Tests/images/morph_a.png')
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self.assert_image_equal(self.A, im)
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def create_lut(self):
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for op in (
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'corner', 'dilation4', 'dilation8',
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'erosion4', 'erosion8', 'edge'):
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lb = ImageMorph.LutBuilder(op_name=op)
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lut = lb.build_lut()
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with open('Tests/images/%s.lut' % op, 'wb') as f:
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f.write(lut)
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# create_lut()
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def test_lut(self):
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for op in (
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'corner', 'dilation4', 'dilation8',
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'erosion4', 'erosion8', 'edge'):
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lb = ImageMorph.LutBuilder(op_name=op)
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lut = lb.build_lut()
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with open('Tests/images/%s.lut' % op, 'rb') as f:
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self.assertEqual(lut, bytearray(f.read()))
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# Test the named patterns
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def test_erosion8(self):
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# erosion8
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mop = ImageMorph.MorphOp(op_name='erosion8')
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count, Aout = mop.apply(self.A)
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self.assertEqual(count, 8)
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self.assert_img_equal_img_string(Aout,
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"""
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.......
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.......
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.......
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...1...
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.......
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.......
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.......
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""")
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def test_dialation8(self):
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# dialation8
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mop = ImageMorph.MorphOp(op_name='dilation8')
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count, Aout = mop.apply(self.A)
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self.assertEqual(count, 16)
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self.assert_img_equal_img_string(Aout,
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"""
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.......
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.11111.
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.11111.
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.11111.
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.11111.
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.11111.
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.......
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""")
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def test_erosion4(self):
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# erosion4
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mop = ImageMorph.MorphOp(op_name='dilation4')
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count, Aout = mop.apply(self.A)
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self.assertEqual(count, 12)
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self.assert_img_equal_img_string(Aout,
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"""
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.......
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..111..
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.11111.
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.11111.
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.11111.
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..111..
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.......
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""")
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def test_edge(self):
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# edge
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mop = ImageMorph.MorphOp(op_name='edge')
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count, Aout = mop.apply(self.A)
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self.assertEqual(count, 1)
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self.assert_img_equal_img_string(Aout,
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"""
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.......
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.......
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..111..
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..1.1..
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..111..
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.......
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.......
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""")
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def test_corner(self):
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# Create a corner detector pattern
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mop = ImageMorph.MorphOp(patterns=['1:(... ... ...)->0',
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'4:(00. 01. ...)->1'])
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count, Aout = mop.apply(self.A)
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self.assertEqual(count, 5)
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self.assert_img_equal_img_string(Aout,
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"""
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.......
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.......
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..1.1..
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.......
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..1.1..
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.......
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.......
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""")
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# Test the coordinate counting with the same operator
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coords = mop.match(self.A)
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self.assertEqual(len(coords), 4)
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self.assertEqual(tuple(coords), ((2, 2), (4, 2), (2, 4), (4, 4)))
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coords = mop.get_on_pixels(Aout)
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self.assertEqual(len(coords), 4)
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self.assertEqual(tuple(coords), ((2, 2), (4, 2), (2, 4), (4, 4)))
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def test_non_binary_images(self):
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im = hopper('RGB')
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mop = ImageMorph.MorphOp(op_name="erosion8")
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self.assertRaises(Exception, lambda: mop.apply(im))
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self.assertRaises(Exception, lambda: mop.match(im))
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self.assertRaises(Exception, lambda: mop.get_on_pixels(im))
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if __name__ == '__main__':
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unittest.main()
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