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#!/usr/bin/env python3
r'''Test of the save_image() and load_image() functions
'''
import sys
import numpy as np
import numpysane as nps
import os
testdir = os.path.dirname(os.path.realpath(__file__))
# I import the LOCAL mrcal since that's what I'm testing
sys.path[:0] = f"{testdir}/..",
import mrcal
import testutils
import tempfile
import atexit
import shutil
workdir = tempfile.mkdtemp()
def cleanup():
global workdir
try:
shutil.rmtree(workdir)
workdir = None
except:
pass
atexit.register(cleanup)
W,H = 133,211
images = dict()
images[8] = np.arange(W*H, dtype=np.uint8).reshape(H,W)
images[8] *= images[8]
images[16] = np.arange(W*H, dtype=np.uint16).reshape(H,W)
images[16] *= images[16]
images[24] = np.arange(W*H*3, dtype=np.uint8).reshape(H,W,3)
images[24] *= images[24]
filename_pattern = f"{workdir}/tst.{{extension}}"
def _check_load(filename, image_ref, what,
should_fail_load = False,
compare_value = True,
extension = None,
**kwargs):
if should_fail_load:
testutils.confirm_raises(lambda: mrcal.load_image(filename, **kwargs),
msg = f"Loading {what} image should fail")
return
try:
image_check = mrcal.load_image(filename, **kwargs)
except Exception as e:
testutils.confirm(False,
msg = f"Error loading {what} image: {e}")
return
testutils.confirm(True,
msg = f"Success loading {what} image")
# print(image_ref.shape)
# print(image_check.shape)
# print(image_ref.dtype)
# print(image_check.dtype)
bpp_load = kwargs.get('bits_per_pixel')
channels_load = kwargs.get('channels')
if bpp_load is not None:
H,W = image_ref.shape[:2]
if bpp_load == 8:
testutils.confirm_equal(image_check.shape, (H,W),
msg = "Shapes match. Loading 8bpp-1channel image")
testutils.confirm_equal(image_check.ndim, 2,
msg = "channels match. Loading 8bpp-1channel image")
testutils.confirm(image_check.dtype == np.uint8,
msg = "dtype match. Loading 8bpp-1channel image")
elif bpp_load == 16:
testutils.confirm_equal(image_check.shape, (H,W),
msg = "Shapes match. Loading 16bpp-1channel image")
testutils.confirm_equal(image_check.ndim, 2,
msg = "channels match. Loading 16bpp-1channel image")
testutils.confirm(image_check.dtype == np.uint16,
msg = "dtype match. Loading 16bpp-1channel image")
elif bpp_load == 24:
testutils.confirm_equal(image_check.shape, (H,W,3),
msg = "Shapes match. Loading 24bpp-3channel image")
testutils.confirm_equal(image_check.ndim, 3,
msg = "channels match. Loading 24bpp-3channel image")
testutils.confirm(image_check.dtype == np.uint8,
msg = "dtype match. Loading 24bpp-3channel image")
if compare_value:
# jpg is approximate
if extension == 'jpg':
eps = 10
percentile = 95
worstcase = False
else:
eps = 1e-6
percentile = None
worstcase = True
if bpp_load == 24 and image_ref.ndim==2:
image_ref = nps.glue( nps.dummy(image_ref,-1),
nps.dummy(image_ref,-1),
nps.dummy(image_ref,-1),
axis = -1)
# signed cast to make approximate comparisons work. Otherwise <0 wraps
# around
testutils.confirm_equal(image_ref.astype(np.int32), image_check.astype(np.int32),
worstcase = worstcase,
eps = eps,
percentile = percentile,
msg = f"load/save match for {what}")
for bpp,extension,what in ( (8, 'png', "8bpp png grayscale"),
(16, 'png', "16bpp png grayscale"),
(24, 'png', "24bpp png bgr"),
(8, 'jpg', "8bpp jpg grayscale"),
(24, 'jpg', "24bpp jpg bgr")):
filename = filename_pattern.format(extension=extension)
image = images[bpp]
try:
mrcal.save_image(filename, image)
except:
testutils.confirm(False,
msg = f"Error saving {what} image")
continue
testutils.confirm(True,
msg = f"Success saving {what} image")
def check_load(**kwargs):
if 'bits_per_pixel' not in kwargs:
_check_load(filename, image,
what,
extension = extension,
**kwargs)
else:
_check_load(filename, image,
f"{what} (loading as {kwargs['bits_per_pixel']}bpp)",
extension = extension,
**kwargs)
check_load()
if bpp == 8:
check_load(bits_per_pixel = 16,
channels = 1,
should_fail_load = True)
check_load(bits_per_pixel = 24,
channels = 3)
if bpp == 16:
check_load(bits_per_pixel = 8,
channels = 1,
# values won't match: this path equalizes
compare_value = False)
check_load(bits_per_pixel = 24,
channels = 3,
should_fail_load = True)
if bpp == 24:
check_load(bits_per_pixel = 8,
channels = 1,
# values won't match: colors are collapsed
compare_value = False)
check_load(bits_per_pixel = 16,
channels = 1,
should_fail_load = True)
testutils.finish()
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