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335 lines
9.1 KiB
Python
335 lines
9.1 KiB
Python
# Test the ImageMorphology functionality
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from __future__ import annotations
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from pathlib import Path
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import pytest
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from PIL import Image, ImageMorph, _imagingmorph
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from .helper import assert_image_equal_tofile, hopper
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def string_to_img(image_string: str) -> Image.Image:
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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") 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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A = 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(im: Image.Image) -> str:
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"""Turn a (small) binary image into a string representation"""
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chars = ".1"
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result = []
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for r in range(im.height):
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line = ""
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for c in range(im.width):
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value = im.getpixel((c, r))
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assert not isinstance(value, tuple)
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assert value is not None
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line += chars[value > 0]
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result.append(line)
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return "\n".join(result)
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def img_string_normalize(im: str) -> str:
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return img_to_string(string_to_img(im))
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def assert_img_equal_img_string(a: Image.Image, b_string: str) -> None:
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assert img_to_string(a) == img_string_normalize(b_string)
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def test_str_to_img() -> None:
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assert_image_equal_tofile(A, "Tests/images/morph_a.png")
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@pytest.mark.parametrize(
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"op", ("corner", "dilation4", "dilation8", "erosion4", "erosion8", "edge")
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)
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def test_lut(op: str) -> None:
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lb = ImageMorph.LutBuilder(op_name=op)
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assert lb.get_lut() is None
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lut = lb.build_lut()
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with open(f"Tests/images/{op}.lut", "rb") as f:
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assert lut == bytearray(f.read())
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def test_no_operator_loaded() -> None:
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im = Image.new("L", (1, 1))
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mop = ImageMorph.MorphOp()
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with pytest.raises(Exception, match="No operator loaded"):
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mop.apply(im)
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with pytest.raises(Exception, match="No operator loaded"):
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mop.match(im)
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with pytest.raises(Exception, match="No operator loaded"):
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mop.save_lut("")
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# Test the named patterns
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def test_erosion8() -> None:
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# erosion8
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mop = ImageMorph.MorphOp(op_name="erosion8")
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count, Aout = mop.apply(A)
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assert count == 8
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assert_img_equal_img_string(
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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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)
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def test_dialation8() -> None:
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# dialation8
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mop = ImageMorph.MorphOp(op_name="dilation8")
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count, Aout = mop.apply(A)
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assert count == 16
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assert_img_equal_img_string(
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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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)
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def test_erosion4() -> None:
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# erosion4
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mop = ImageMorph.MorphOp(op_name="dilation4")
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count, Aout = mop.apply(A)
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assert count == 12
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assert_img_equal_img_string(
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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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)
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def test_edge() -> None:
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# edge
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mop = ImageMorph.MorphOp(op_name="edge")
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count, Aout = mop.apply(A)
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assert count == 1
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assert_img_equal_img_string(
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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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)
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def test_corner() -> None:
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# Create a corner detector pattern
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mop = ImageMorph.MorphOp(patterns=["1:(... ... ...)->0", "4:(00. 01. ...)->1"])
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count, Aout = mop.apply(A)
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assert count == 5
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assert_img_equal_img_string(
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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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)
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# Test the coordinate counting with the same operator
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coords = mop.match(A)
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assert len(coords) == 4
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assert tuple(coords) == ((2, 2), (4, 2), (2, 4), (4, 4))
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coords = mop.get_on_pixels(Aout)
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assert len(coords) == 4
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assert tuple(coords) == ((2, 2), (4, 2), (2, 4), (4, 4))
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def test_mirroring() -> None:
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# Test 'M' for mirroring
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mop = ImageMorph.MorphOp(patterns=["1:(... ... ...)->0", "M:(00. 01. ...)->1"])
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count, Aout = mop.apply(A)
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assert count == 7
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assert_img_equal_img_string(
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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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.......
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.......
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.......
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""",
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)
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def test_negate() -> None:
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# Test 'N' for negate
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mop = ImageMorph.MorphOp(patterns=["1:(... ... ...)->0", "N:(00. 01. ...)->1"])
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count, Aout = mop.apply(A)
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assert count == 8
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assert_img_equal_img_string(
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Aout,
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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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""",
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)
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def test_incorrect_mode() -> None:
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im = hopper("RGB")
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mop = ImageMorph.MorphOp(op_name="erosion8")
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with pytest.raises(ValueError, match="Image mode must be L"):
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mop.apply(im)
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with pytest.raises(ValueError, match="Image mode must be L"):
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mop.match(im)
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with pytest.raises(ValueError, match="Image mode must be L"):
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mop.get_on_pixels(im)
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def test_add_patterns() -> None:
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# Arrange
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lb = ImageMorph.LutBuilder(op_name="corner")
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assert lb.patterns == ["1:(... ... ...)->0", "4:(00. 01. ...)->1"]
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new_patterns = ["M:(00. 01. ...)->1", "N:(00. 01. ...)->1"]
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# Act
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lb.add_patterns(new_patterns)
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# Assert
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assert lb.patterns == [
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"1:(... ... ...)->0",
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"4:(00. 01. ...)->1",
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"M:(00. 01. ...)->1",
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"N:(00. 01. ...)->1",
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]
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def test_unknown_pattern() -> None:
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with pytest.raises(Exception):
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ImageMorph.LutBuilder(op_name="unknown")
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def test_pattern_syntax_error() -> None:
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# Arrange
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lb = ImageMorph.LutBuilder(op_name="corner")
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new_patterns = ["a pattern with a syntax error"]
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lb.add_patterns(new_patterns)
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# Act / Assert
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with pytest.raises(
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Exception, match='Syntax error in pattern "a pattern with a syntax error"'
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):
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lb.build_lut()
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def test_load_invalid_mrl() -> None:
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# Arrange
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invalid_mrl = "Tests/images/hopper.png"
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mop = ImageMorph.MorphOp()
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# Act / Assert
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with pytest.raises(Exception, match="Wrong size operator file!"):
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mop.load_lut(invalid_mrl)
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def test_roundtrip_mrl(tmp_path: Path) -> None:
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# Arrange
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tempfile = str(tmp_path / "temp.mrl")
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mop = ImageMorph.MorphOp(op_name="corner")
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initial_lut = mop.lut
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# Act
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mop.save_lut(tempfile)
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mop.load_lut(tempfile)
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# Act / Assert
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assert mop.lut == initial_lut
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def test_set_lut() -> None:
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# Arrange
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lb = ImageMorph.LutBuilder(op_name="corner")
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lut = lb.build_lut()
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mop = ImageMorph.MorphOp()
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# Act
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mop.set_lut(lut)
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# Assert
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assert mop.lut == lut
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def test_wrong_mode() -> None:
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lut = ImageMorph.LutBuilder(op_name="corner").build_lut()
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imrgb_ptr = Image.new("RGB", (10, 10)).getim()
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iml_ptr = Image.new("L", (10, 10)).getim()
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with pytest.raises(RuntimeError):
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_imagingmorph.apply(bytes(lut), imrgb_ptr, iml_ptr)
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with pytest.raises(RuntimeError):
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_imagingmorph.apply(bytes(lut), iml_ptr, imrgb_ptr)
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with pytest.raises(RuntimeError):
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_imagingmorph.match(bytes(lut), imrgb_ptr)
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# Should not raise
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_imagingmorph.match(bytes(lut), iml_ptr)
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