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TST: add MSE, NRMSE test that would fail in case of int overflow

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This commit is contained in:
Gregory R. Lee
2016-01-27 11:24:56 -05:00
parent acef026676
commit ea3ad97b3e
1 changed files with 10 additions and 3 deletions
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skimage/measure/tests/test_simple_metrics.py
+10 -3
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@@ -2,7 +2,7 @@ import numpy as np
from numpy.testing import (run_module_suite, assert_equal, assert_raises,
assert_almost_equal)
from skimage.measure import psnr, nrmse
from skimage.measure import psnr, nrmse, mse
import skimage.data
np.random.seed(5)
@@ -23,7 +23,7 @@ def test_PSNR_vs_IPOL():
def test_PSNR_float():
p_uint8 = psnr(cam, cam_noisy)
p_float64 = psnr(cam/255., cam_noisy/255., dynamic_range=1)
assert_almost_equal(p_uint8, p_float64)
assert_almost_equal(p_uint8, p_float64, decimal=5)
def test_PSNR_errors():
@@ -38,7 +38,14 @@ def test_NRMSE():
assert_equal(nrmse(y, x, 'Euclidean'), 1/np.sqrt(3))
assert_equal(nrmse(y, x, 'min-max'), 1/(y.max()-y.min()))
assert_equal(nrmse(x, x), 0)
def test_NRMSE_no_int_overflow():
camf = cam.astype(np.float32)
cam_noisyf = cam_noisy.astype(np.float32)
assert_almost_equal(mse(cam, cam_noisy),
mse(camf, cam_noisyf))
assert_almost_equal(nrmse(cam, cam_noisy),
nrmse(camf, cam_noisyf))
def test_NRMSE_errors():