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improve resize test

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This commit is contained in:
homm 2016-07-11 00:47:58 +03:00
parent 1321713688
commit 5b8c8aa389
1 changed files with 28 additions and 26 deletions
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52
Tests/test_image_transform.py
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@ -148,15 +148,14 @@ class TestImageTransformAffine(PillowTestCase):
im = hopper('RGB') im = hopper('RGB')
return im.crop((10, 20, im.width - 10, im.height - 20)) return im.crop((10, 20, im.width - 10, im.height - 20))
def _test_rotate(self, angle, transpose): def _test_rotate(self, deg, transpose):
im = self._test_image() im = self._test_image()
angle = - math.radians(angle) angle = - math.radians(deg)
matrix = [ matrix = [
round(math.cos(angle), 15), round(math.sin(angle), 15), 0.0, round(math.cos(angle), 15), round(math.sin(angle), 15), 0.0,
round(-math.sin(angle), 15), round(math.cos(angle), 15), 0.0, round(-math.sin(angle), 15), round(math.cos(angle), 15), 0.0,
0, 0, 0, 0]
]
matrix[2] = (1 - matrix[0] - matrix[1]) * im.width / 2 matrix[2] = (1 - matrix[0] - matrix[1]) * im.width / 2
matrix[5] = (1 - matrix[3] - matrix[4]) * im.height / 2 matrix[5] = (1 - matrix[3] - matrix[4]) * im.height / 2
@ -164,6 +163,7 @@ class TestImageTransformAffine(PillowTestCase):
transposed = im.transpose(transpose) transposed = im.transpose(transpose)
else: else:
transposed = im transposed = im
for resample in [Image.NEAREST, Image.BILINEAR, Image.BICUBIC]: for resample in [Image.NEAREST, Image.BILINEAR, Image.BICUBIC]:
transformed = im.transform(transposed.size, self.transform, transformed = im.transform(transposed.size, self.transform,
matrix, resample) matrix, resample)
@ -181,53 +181,55 @@ class TestImageTransformAffine(PillowTestCase):
def test_rotate_270_deg(self): def test_rotate_270_deg(self):
self._test_rotate(270, Image.ROTATE_270) self._test_rotate(270, Image.ROTATE_270)
def _test_resize(self, scale): def _test_resize(self, scale, epsilonscale):
im = self._test_image() im = self._test_image()
matrix = [
size_up = int(round(im.width * scale)), int(round(im.height * scale))
matrix_up = [
1 / scale, 0, 0, 1 / scale, 0, 0,
0, 1 / scale, 0, 0, 1 / scale, 0,
0, 0, 0, 0]
] matrix_down = [
size = int(round(im.width * scale)), int(round(im.height * scale))
transformed = im.transform(
size, self.transform, matrix, Image.NEAREST)
matrix = [
scale, 0, 0, scale, 0, 0,
0, scale, 0, 0, scale, 0,
0, 0, 0, 0]
]
for resample, epsilon in [(Image.NEAREST, 0),
(Image.BILINEAR, 2), (Image.BICUBIC, 1)]:
transformed = im.transform(
size_up, self.transform, matrix_up, resample)
transformed = transformed.transform( transformed = transformed.transform(
im.size, self.transform, matrix, Image.NEAREST) im.size, self.transform, matrix_down, resample)
self.assert_image_equal(im, transformed) self.assert_image_similar(transformed, im, epsilon * epsilonscale)
def test_resize_1_1x(self): def test_resize_1_1x(self):
self._test_resize(1.1) self._test_resize(1.1, 6.9)
def test_resize_1_5x(self): def test_resize_1_5x(self):
self._test_resize(1.5) self._test_resize(1.5, 5.5)
def test_resize_2_0x(self): def test_resize_2_0x(self):
self._test_resize(2.0) self._test_resize(2.0, 5.5)
def test_resize_2_3x(self): def test_resize_2_3x(self):
self._test_resize(2.3) self._test_resize(2.3, 3.7)
def test_resize_2_5x(self): def test_resize_2_5x(self):
self._test_resize(2.5) self._test_resize(2.5, 3.7)
def _test_translate(self, x, y, epsilonscale): def _test_translate(self, x, y, epsilonscale):
im = self._test_image() im = self._test_image()
size_up = int(round(im.width + x)), int(round(im.height + y)) size_up = int(round(im.width + x)), int(round(im.height + y))
matrix_up = [ matrix_up = [
1, 0, -x, 1, 0, -x,
0, 1, -y, 0, 1, -y,
0, 0, 0, 0]
]
matrix_down = [ matrix_down = [
1, 0, x, 1, 0, x,
0, 1, y, 0, 1, y,
0, 0, 0, 0]
]
for resample, epsilon in [(Image.NEAREST, 0), for resample, epsilon in [(Image.NEAREST, 0),
(Image.BILINEAR, 1.5), (Image.BICUBIC, 1)]: (Image.BILINEAR, 1.5), (Image.BICUBIC, 1)]:
transformed = im.transform( transformed = im.transform(