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libvips/test/test_conversion.py
Benjamin Gilbert 5ed7a24f0c Drop dependency on Python "future" package 
It's not widely packaged in Linux distributions, and none of the VIPS
Python code requires Python 3 semantics from any of the builtins future
was replacing.
2014-12-26 21:10:55 -05:00

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#!/usr/bin/python
from __future__ import division
import unittest
import math
#import logging
#logging.basicConfig(level = logging.DEBUG)
from gi.repository import Vips
from functools import reduce
unsigned_formats = [Vips.BandFormat.UCHAR,
Vips.BandFormat.USHORT,
Vips.BandFormat.UINT]
signed_formats = [Vips.BandFormat.CHAR,
Vips.BandFormat.SHORT,
Vips.BandFormat.INT]
float_formats = [Vips.BandFormat.FLOAT,
Vips.BandFormat.DOUBLE]
complex_formats = [Vips.BandFormat.COMPLEX,
Vips.BandFormat.DPCOMPLEX]
int_formats = unsigned_formats + signed_formats
noncomplex_formats = int_formats + float_formats
all_formats = int_formats + float_formats + complex_formats
max_value = {Vips.BandFormat.UCHAR: 0xff,
Vips.BandFormat.USHORT: 0xffff,
Vips.BandFormat.UINT: 0xffffffff,
Vips.BandFormat.CHAR: 0x7f,
Vips.BandFormat.SHORT: 0x7fff,
Vips.BandFormat.INT: 0x7fffffff,
Vips.BandFormat.FLOAT: 1.0,
Vips.BandFormat.DOUBLE: 1.0,
Vips.BandFormat.COMPLEX: 1.0,
Vips.BandFormat.DPCOMPLEX: 1.0}
sizeof_format = {Vips.BandFormat.UCHAR: 1,
Vips.BandFormat.USHORT: 2,
Vips.BandFormat.UINT: 4,
Vips.BandFormat.CHAR: 1,
Vips.BandFormat.SHORT: 2,
Vips.BandFormat.INT: 4,
Vips.BandFormat.FLOAT: 4,
Vips.BandFormat.DOUBLE: 8,
Vips.BandFormat.COMPLEX: 8,
Vips.BandFormat.DPCOMPLEX: 16}
rot45_angles = [Vips.Angle45.D0,
Vips.Angle45.D45,
Vips.Angle45.D90,
Vips.Angle45.D135,
Vips.Angle45.D180,
Vips.Angle45.D225,
Vips.Angle45.D270,
Vips.Angle45.D315]
rot45_angle_bonds = [Vips.Angle45.D0,
Vips.Angle45.D315,
Vips.Angle45.D270,
Vips.Angle45.D225,
Vips.Angle45.D180,
Vips.Angle45.D135,
Vips.Angle45.D90,
Vips.Angle45.D45]
rot_angles = [Vips.Angle.D0,
Vips.Angle.D90,
Vips.Angle.D180,
Vips.Angle.D270]
rot_angle_bonds = [Vips.Angle.D0,
Vips.Angle.D270,
Vips.Angle.D180,
Vips.Angle.D90]
# an expanding zip ... if either of the args is not a list, duplicate it down
# the other
def zip_expand(x, y):
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 TestConversion(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)
# run a function on an image and on a single pixel, the results
# should match
def run_cmp_unary(self, message, im, x, y, fn):
a = im.getpoint(x, y)
v1 = fn(a)
im2 = fn(im)
v2 = im2.getpoint(x, y)
self.assertAlmostEqualObjects(v1, v2, msg = message)
# run a function on a pair of images and on a pair of pixels, the results
# should match
def run_cmp_binary(self, message, left, right, x, y, fn):
a = left.getpoint(x, y)
b = right.getpoint(x, y)
v1 = fn(a, b)
after = fn(left, right)
v2 = after.getpoint(x, y)
self.assertAlmostEqualObjects(v1, v2, msg = message)
# run a function on a pair of images
# 50,50 and 10,10 should have different values on the test image
def run_testbinary(self, message, left, right, fn):
self.run_cmp_binary(message, left, right, 50, 50, fn)
self.run_cmp_binary(message, left, right, 10, 10, fn)
# run a function on an image,
# 50,50 and 10,10 should have different values on the test image
def run_testunary(self, message, im, fn):
self.run_cmp_unary(message, im, 50, 50, fn)
self.run_cmp_unary(message, im, 10, 10, fn)
def run_unary(self, images, fn, fmt = all_formats):
[self.run_testunary(fn.__name__ + (' %s' % y), x.cast(y), fn)
for x in images for y in fmt]
def run_binary(self, images, fn, fmt = all_formats):
[self.run_testbinary(fn.__name__ + (' %s %s' % (y, z)),
x.cast(y), x.cast(z), fn)
for x in images for y in fmt for z in fmt]
def setUp(self):
im = Vips.Image.mask_ideal(100, 100, 0.5, reject = True, optical = True)
self.colour = im * [1, 2, 3] + [2, 3, 4]
self.mono = self.colour.extract_band(1)
self.all_images = [self.mono, self.colour]
def test_band_and(self):
def band_and(x):
if isinstance(x, Vips.Image):
return x.bandbool(Vips.OperationBoolean.AND)
else:
return [reduce(lambda a, b: int(a) & int(b), x)]
self.run_unary(self.all_images, band_and, fmt = int_formats)
def test_band_or(self):
def band_or(x):
if isinstance(x, Vips.Image):
return x.bandbool(Vips.OperationBoolean.OR)
else:
return [reduce(lambda a, b: int(a) | int(b), x)]
self.run_unary(self.all_images, band_or, fmt = int_formats)
def test_band_eor(self):
def band_eor(x):
if isinstance(x, Vips.Image):
return x.bandbool(Vips.OperationBoolean.EOR)
else:
return [reduce(lambda a, b: int(a) ^ int(b), x)]
self.run_unary(self.all_images, band_eor, fmt = int_formats)
def test_bandjoin(self):
def bandjoin(x, y):
if isinstance(x, Vips.Image) and isinstance(y, Vips.Image):
return x.bandjoin(y)
else:
return x + y
self.run_binary(self.all_images, bandjoin)
def test_bandmean(self):
def bandmean(x):
if isinstance(x, Vips.Image):
return x.bandmean()
else:
return [sum(x) // len(x)]
self.run_unary(self.all_images, bandmean, fmt = noncomplex_formats)
def test_bandrank(self):
def median(x, y):
joined = [[a, b] for a, b in zip(x, y)]
# .sort() isn't a function, so we have to run this as a separate
# pass
[x.sort() for x in joined]
return [x[len(x) // 2] for x in joined]
def bandrank(x, y):
if isinstance(x, Vips.Image) and isinstance(y, Vips.Image):
return Vips.Image.bandrank([x, y])
else:
return median(x, y)
self.run_binary(self.all_images, bandrank, fmt = noncomplex_formats)
def test_cache(self):
def cache(x):
if isinstance(x, Vips.Image):
return x.cache()
else:
return x
self.run_unary(self.all_images, cache)
def test_copy(self):
x = self.colour.copy(interpretation = Vips.Interpretation.LAB)
self.assertEqual(x.interpretation, Vips.Interpretation.LAB)
x = self.colour.copy(xres = 42)
self.assertEqual(x.xres, 42)
x = self.colour.copy(yres = 42)
self.assertEqual(x.yres, 42)
x = self.colour.copy(xoffset = 42)
self.assertEqual(x.xoffset, 42)
x = self.colour.copy(yoffset = 42)
self.assertEqual(x.yoffset, 42)
x = self.colour.copy(bands = 1)
self.assertEqual(x.bands, 1)
x = self.colour.copy(format = Vips.BandFormat.USHORT, bands = 1)
self.assertEqual(x.format, Vips.BandFormat.USHORT)
x = self.colour.copy(coding = Vips.Coding.NONE)
self.assertEqual(x.coding, Vips.Coding.NONE)
x = self.colour.copy(width = 42)
self.assertEqual(x.width, 42)
x = self.colour.copy(height = 42)
self.assertEqual(x.height, 42)
def test_embed(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
im = test.embed(20, 20,
self.colour.width + 40,
self.colour.height + 40)
pixel = im.getpoint(10, 10)
self.assertAlmostEqualObjects(pixel, [0, 0, 0])
pixel = im.getpoint(30, 30)
self.assertAlmostEqualObjects(pixel, [2, 3, 4])
pixel = im.getpoint(im.width - 10, im.height - 10)
self.assertAlmostEqualObjects(pixel, [0, 0, 0])
im = test.embed(20, 20,
self.colour.width + 40,
self.colour.height + 40,
extend = Vips.Extend.COPY)
pixel = im.getpoint(10, 10)
self.assertAlmostEqualObjects(pixel, [2, 3, 4])
pixel = im.getpoint(im.width - 10, im.height - 10)
self.assertAlmostEqualObjects(pixel, [2, 3, 4])
im = test.embed(20, 20,
self.colour.width + 40,
self.colour.height + 40,
extend = Vips.Extend.BACKGROUND,
background = [7, 8, 9])
pixel = im.getpoint(10, 10)
self.assertAlmostEqualObjects(pixel, [7, 8, 9])
pixel = im.getpoint(im.width - 10, im.height - 10)
self.assertAlmostEqualObjects(pixel, [7, 8, 9])
im = test.embed(20, 20,
self.colour.width + 40,
self.colour.height + 40,
extend = Vips.Extend.WHITE)
pixel = im.getpoint(10, 10)
# uses 255 in all bytes of ints, 255.0 for float
pixel = [int(x) & 0xff for x in pixel]
self.assertAlmostEqualObjects(pixel, [255, 255, 255])
pixel = im.getpoint(im.width - 10, im.height - 10)
pixel = [int(x) & 0xff for x in pixel]
self.assertAlmostEqualObjects(pixel, [255, 255, 255])
def test_extract(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
pixel = test.getpoint(30, 30)
self.assertAlmostEqualObjects(pixel, [2, 3, 4])
sub = test.extract_area(25, 25, 10, 10)
pixel = sub.getpoint(5, 5)
self.assertAlmostEqualObjects(pixel, [2, 3, 4])
sub = test.extract_band(1, n = 2)
pixel = sub.getpoint(30, 30)
self.assertAlmostEqualObjects(pixel, [3, 4])
def test_crop(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
pixel = test.getpoint(30, 30)
self.assertAlmostEqualObjects(pixel, [2, 3, 4])
sub = test.crop(25, 25, 10, 10)
pixel = sub.getpoint(5, 5)
self.assertAlmostEqualObjects(pixel, [2, 3, 4])
def test_falsecolour(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
im = test.falsecolour()
self.assertEqual(im.width, test.width)
self.assertEqual(im.height, test.height)
self.assertEqual(im.bands, 3)
pixel = im.getpoint(30, 30)
self.assertAlmostEqualObjects(pixel, [20, 0, 41])
def test_flatten(self):
max_value = {Vips.BandFormat.UCHAR: 0xff,
Vips.BandFormat.USHORT: 0xffff,
Vips.BandFormat.UINT: 0xffffffff,
Vips.BandFormat.CHAR: 0x7f,
Vips.BandFormat.SHORT: 0x7fff,
Vips.BandFormat.INT: 0x7fffffff,
Vips.BandFormat.FLOAT: 1.0,
Vips.BandFormat.DOUBLE: 1.0,
Vips.BandFormat.COMPLEX: 1.0,
Vips.BandFormat.DPCOMPLEX: 1.0}
black = self.mono * 0.0
for fmt in noncomplex_formats:
mx = max_value[fmt]
alpha = mx / 2.0
nalpha = mx - alpha
test = self.colour.bandjoin(black + alpha).cast(fmt)
pixel = test.getpoint(30, 30)
predict = [int(x) * alpha / mx for x in pixel[:-1]]
im = test.flatten()
self.assertEqual(im.bands, 3)
pixel = im.getpoint(30, 30)
for x, y in zip(pixel, predict):
# we use float arithetic for int and uint, so the rounding
# differs ... don't require huge accuracy
self.assertLess(abs(x - y), 2)
im = test.flatten(background = [100, 100, 100])
pixel = test.getpoint(30, 30)
predict = [int(x) * alpha / mx + (100 * nalpha) / mx
for x in pixel[:-1]]
self.assertEqual(im.bands, 3)
pixel = im.getpoint(30, 30)
for x, y in zip(pixel, predict):
self.assertLess(abs(x - y), 2)
def test_flip(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
result = test.flip(Vips.Direction.HORIZONTAL)
result = result.flip(Vips.Direction.VERTICAL)
result = result.flip(Vips.Direction.HORIZONTAL)
result = result.flip(Vips.Direction.VERTICAL)
diff = (test - result).abs().max()
self.assertEqual(diff, 0)
def test_gamma(self):
exponent = 2.4
for fmt in noncomplex_formats:
mx = max_value[fmt]
test = (self.colour + mx / 2.0).cast(fmt)
norm = mx ** exponent / mx
result = test.gamma()
before = test.getpoint(30, 30)
after = result.getpoint(30, 30)
predict = [x ** exponent / norm for x in before]
for a, b in zip(after, predict):
# ie. less than 1% error, rounding on 7-bit images means this is
# all we can expect
self.assertLess(abs(a - b), mx / 100.0)
exponent = 1.2
for fmt in noncomplex_formats:
mx = max_value[fmt]
test = (self.colour + mx / 2.0).cast(fmt)
norm = mx ** exponent / mx
result = test.gamma(exponent = 1.0 / 1.2)
before = test.getpoint(30, 30)
after = result.getpoint(30, 30)
predict = [x ** exponent / norm for x in before]
for a, b in zip(after, predict):
# ie. less than 1% error, rounding on 7-bit images means this is
# all we can expect
self.assertLess(abs(a - b), mx / 100.0)
def test_grid(self):
test = self.colour.replicate(1, 12)
self.assertEqual(test.width, self.colour.width)
self.assertEqual(test.height, self.colour.height * 12)
for fmt in all_formats:
im = test.cast(fmt)
result = im.grid(test.width, 3, 4)
self.assertEqual(result.width, self.colour.width * 3)
self.assertEqual(result.height, self.colour.height * 4)
before = im.getpoint(10, 10)
after = result.getpoint(10 + test.width * 2, 10 + test.width * 2)
self.assertAlmostEqualObjects(before, after)
before = im.getpoint(50, 50)
after = result.getpoint(50 + test.width * 2, 50 + test.width * 2)
self.assertAlmostEqualObjects(before, after)
def test_ifthenelse(self):
test = self.mono > 3
for x in all_formats:
for y in all_formats:
t = (self.colour + 10).cast(x)
e = self.colour.cast(y)
r = test.ifthenelse(t, e)
self.assertEqual(r.width, self.colour.width)
self.assertEqual(r.height, self.colour.height)
self.assertEqual(r.bands, self.colour.bands)
predict = e.getpoint(10, 10)
result = r.getpoint(10, 10)
self.assertAlmostEqualObjects(result, predict)
predict = t.getpoint(50, 50)
result = r.getpoint(50, 50)
self.assertAlmostEqualObjects(result, predict)
test = self.colour > 3
for x in all_formats:
for y in all_formats:
t = (self.mono + 10).cast(x)
e = self.mono.cast(y)
r = test.ifthenelse(t, e)
self.assertEqual(r.width, self.colour.width)
self.assertEqual(r.height, self.colour.height)
self.assertEqual(r.bands, self.colour.bands)
cp = test.getpoint(10, 10)
tp = t.getpoint(10, 10) * 3
ep = e.getpoint(10, 10) * 3
predict = [te if ce != 0 else ee
for ce, te, ee in zip(cp, tp, ep)]
result = r.getpoint(10, 10)
self.assertAlmostEqualObjects(result, predict)
cp = test.getpoint(50, 50)
tp = t.getpoint(50, 50) * 3
ep = e.getpoint(50, 50) * 3
predict = [te if ce != 0 else ee
for ce, te, ee in zip(cp, tp, ep)]
result = r.getpoint(50, 50)
self.assertAlmostEqualObjects(result, predict)
test = self.colour > 3
for x in all_formats:
for y in all_formats:
t = (self.mono + 10).cast(x)
e = self.mono.cast(y)
r = test.ifthenelse(t, e, blend = True)
self.assertEqual(r.width, self.colour.width)
self.assertEqual(r.height, self.colour.height)
self.assertEqual(r.bands, self.colour.bands)
result = r.getpoint(10, 10)
self.assertAlmostEqualObjects(result, [3, 3, 13])
def test_insert(self):
for x in all_formats:
for y in all_formats:
main = self.mono.cast(x)
sub = self.colour.cast(y)
r = main.insert(sub, 10, 10)
self.assertEqual(r.width, main.width)
self.assertEqual(r.height, main.height)
self.assertEqual(r.bands, sub.bands)
a = r.getpoint(10, 10)
b = sub.getpoint(0, 0)
self.assertAlmostEqualObjects(a, b)
a = r.getpoint(0, 0)
b = main.getpoint(0, 0) * 3
self.assertAlmostEqualObjects(a, b)
for x in all_formats:
for y in all_formats:
main = self.mono.cast(x)
sub = self.colour.cast(y)
r = main.insert(sub, 10, 10, expand = True, background = 100)
self.assertEqual(r.width, main.width + 10)
self.assertEqual(r.height, main.height + 10)
self.assertEqual(r.bands, sub.bands)
a = r.getpoint(r.width - 5, 5)
self.assertAlmostEqualObjects(a, [100, 100, 100])
def test_msb(self):
for fmt in unsigned_formats:
mx = max_value[fmt]
size = sizeof_format[fmt]
test = (self.colour + mx / 8.0).cast(fmt)
im = test.msb()
before = test.getpoint(10, 10)
predict = [int(x) >> ((size - 1) * 8) for x in before]
result = im.getpoint(10, 10)
self.assertAlmostEqualObjects(result, predict)
before = test.getpoint(50, 50)
predict = [int(x) >> ((size - 1) * 8) for x in before]
result = im.getpoint(50, 50)
self.assertAlmostEqualObjects(result, predict)
for fmt in signed_formats:
mx = max_value[fmt]
size = sizeof_format[fmt]
test = (self.colour + mx / 8.0).cast(fmt)
im = test.msb()
before = test.getpoint(10, 10)
predict = [128 + (int(x) >> ((size - 1) * 8)) for x in before]
result = im.getpoint(10, 10)
self.assertAlmostEqualObjects(result, predict)
before = test.getpoint(50, 50)
predict = [128 + (int(x) >> ((size - 1) * 8)) for x in before]
result = im.getpoint(50, 50)
self.assertAlmostEqualObjects(result, predict)
for fmt in unsigned_formats:
mx = max_value[fmt]
size = sizeof_format[fmt]
test = (self.colour + mx / 8.0).cast(fmt)
im = test.msb(band = 1)
before = [test.getpoint(10, 10)[1]]
predict = [int(x) >> ((size - 1) * 8) for x in before]
result = im.getpoint(10, 10)
self.assertAlmostEqualObjects(result, predict)
before = [test.getpoint(50, 50)[1]]
predict = [int(x) >> ((size - 1) * 8) for x in before]
result = im.getpoint(50, 50)
self.assertAlmostEqualObjects(result, predict)
def test_recomb(self):
array = [[0.2, 0.5, 0.3]]
mask = Vips.Image.new_from_array(array)
def recomb(x):
if isinstance(x, Vips.Image):
return x.recomb(mask)
else:
sum = 0
for i, c in zip(array[0], x):
sum += i * c
return [sum]
self.run_unary([self.colour], recomb, fmt = noncomplex_formats)
def test_replicate(self):
for fmt in all_formats:
im = self.colour.cast(fmt)
test = im.replicate(10, 10)
self.assertEqual(test.width, self.colour.width * 10)
self.assertEqual(test.height, self.colour.height * 10)
before = im.getpoint(10, 10)
after = test.getpoint(10 + im.width * 2, 10 + im.width * 2)
self.assertAlmostEqualObjects(before, after)
before = im.getpoint(50, 50)
after = test.getpoint(50 + im.width * 2, 50 + im.width * 2)
self.assertAlmostEqualObjects(before, after)
def test_rot45(self):
# test has a quarter-circle in the bottom right
test = self.colour.crop(0, 0, 51, 51)
for fmt in all_formats:
im = test.cast(fmt)
im2 = im.rot45()
before = im.getpoint(50, 50)
after = im2.getpoint(25, 50)
self.assertAlmostEqualObjects(before, after)
for a, b in zip(rot45_angles, rot45_angle_bonds):
im2 = im.rot45(angle = a)
after = im2.rot45(angle = b)
diff = (after - im).abs().max()
self.assertEqual(diff, 0)
def test_rot(self):
# test has a quarter-circle in the bottom right
test = self.colour.crop(0, 0, 51, 51)
for fmt in all_formats:
im = test.cast(fmt)
im2 = im.rot(Vips.Angle.D90)
before = im.getpoint(50, 50)
after = im2.getpoint(0, 50)
self.assertAlmostEqualObjects(before, after)
for a, b in zip(rot_angles, rot_angle_bonds):
im2 = im.rot(a)
after = im2.rot(b)
diff = (after - im).abs().max()
self.assertEqual(diff, 0)
def test_scale(self):
for fmt in noncomplex_formats:
test = self.colour.cast(fmt)
im = test.scale()
self.assertEqual(im.max(), 255)
self.assertEqual(im.min(), 0)
im = test.scale(log = True)
self.assertEqual(im.max(), 255)
def test_subsample(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
im = test.subsample(3, 3)
self.assertEqual(im.width, test.width // 3)
self.assertEqual(im.height, test.height // 3)
before = test.getpoint(60, 60)
after = im.getpoint(20, 20)
self.assertAlmostEqualObjects(before, after)
def test_zoom(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
im = test.zoom(3, 3)
self.assertEqual(im.width, test.width * 3)
self.assertEqual(im.height, test.height * 3)
before = test.getpoint(50, 50)
after = im.getpoint(150, 150)
self.assertAlmostEqualObjects(before, after)
def test_wrap(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
im = test.wrap()
self.assertEqual(im.width, test.width)
self.assertEqual(im.height, test.height)
before = test.getpoint(0, 0)
after = im.getpoint(50, 50)
self.assertAlmostEqualObjects(before, after)
before = test.getpoint(50, 50)
after = im.getpoint(0, 0)
self.assertAlmostEqualObjects(before, after)
if __name__ == '__main__':
unittest.main()
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