mirror of
https://github.com/wassname/scikit-image.git
synced 2026-06-28 12:10:54 +08:00
emmanuelle
a5a771a8e4
background=0 by default. Modified label function so that background pixels are labeled with 0, and background=0 by default. All tests of _ccomp.pyx pass Modified a couple of files to be consistent with the new behavior of measure.label Modified doctring of label to pass doctest Modified TODO.txt as well as release notes to mention the new behavior of label. Typo in docstring Typo in docstring Changed default value of kw argument background in measure.label Removed unnecessary and outdated comment
398 lines
13 KiB
Python
398 lines
13 KiB
Python
import numpy as np
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from numpy.testing import assert_almost_equal, assert_equal, assert_raises
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import skimage.transform as tf
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from skimage.draw import line, circle_perimeter, ellipse_perimeter
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from skimage._shared._warnings import expected_warnings
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from skimage._shared.testing import test_parallel
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@test_parallel()
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def test_hough_line():
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# Generate a test image
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img = np.zeros((100, 150), dtype=int)
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rr, cc = line(60, 130, 80, 10)
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img[rr, cc] = 1
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out, angles, d = tf.hough_line(img)
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y, x = np.where(out == out.max())
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dist = d[y[0]]
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theta = angles[x[0]]
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assert_almost_equal(dist, 80.723, 1)
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assert_almost_equal(theta, 1.41, 1)
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def test_hough_line_angles():
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img = np.zeros((10, 10))
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img[0, 0] = 1
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out, angles, d = tf.hough_line(img, np.linspace(0, 360, 10))
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assert_equal(len(angles), 10)
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def test_hough_line_bad_input():
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img = np.zeros(100)
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img[10] = 1
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# Expected error, img must be 2D
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assert_raises(ValueError, tf.hough_line, img, np.linspace(0, 360, 10))
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def test_probabilistic_hough():
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# Generate a test image
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img = np.zeros((100, 100), dtype=int)
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for i in range(25, 75):
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img[100 - i, i] = 100
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img[i, i] = 100
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# decrease default theta sampling because similar orientations may confuse
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# as mentioned in article of Galambos et al
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theta = np.linspace(0, np.pi, 45)
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lines = tf.probabilistic_hough_line(img, threshold=10, line_length=10,
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line_gap=1, theta=theta)
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# sort the lines according to the x-axis
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sorted_lines = []
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for line in lines:
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line = list(line)
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line.sort(key=lambda x: x[0])
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sorted_lines.append(line)
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assert([(25, 75), (74, 26)] in sorted_lines)
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assert([(25, 25), (74, 74)] in sorted_lines)
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# Execute with default theta
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tf.probabilistic_hough_line(img, line_length=10, line_gap=3)
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def test_probabilistic_hough_bad_input():
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img = np.zeros(100)
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img[10] = 1
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# Expected error, img must be 2D
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assert_raises(ValueError, tf.probabilistic_hough_line, img)
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def test_hough_line_peaks():
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img = np.zeros((100, 150), dtype=int)
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rr, cc = line(60, 130, 80, 10)
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img[rr, cc] = 1
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out, angles, d = tf.hough_line(img)
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out, theta, dist = tf.hough_line_peaks(out, angles, d)
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assert_equal(len(dist), 1)
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assert_almost_equal(dist[0], 80.723, 1)
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assert_almost_equal(theta[0], 1.41, 1)
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def test_hough_line_peaks_ordered():
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# Regression test per PR #1421
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testim = np.zeros((256, 64), dtype=np.bool)
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testim[50:100, 20] = True
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testim[85:200, 25] = True
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testim[15:35, 50] = True
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testim[1:-1, 58] = True
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hough_space, angles, dists = tf.hough_line(testim)
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hspace, _, _ = tf.hough_line_peaks(hough_space, angles, dists)
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assert hspace[0] > hspace[1]
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def test_hough_line_peaks_dist():
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img = np.zeros((100, 100), dtype=np.bool_)
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img[:, 30] = True
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img[:, 40] = True
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hspace, angles, dists = tf.hough_line(img)
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assert len(tf.hough_line_peaks(hspace, angles, dists,
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min_distance=5)[0]) == 2
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assert len(tf.hough_line_peaks(hspace, angles, dists,
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min_distance=15)[0]) == 1
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def test_hough_line_peaks_angle():
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check_hough_line_peaks_angle()
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def check_hough_line_peaks_angle():
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img = np.zeros((100, 100), dtype=np.bool_)
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img[:, 0] = True
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img[0, :] = True
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hspace, angles, dists = tf.hough_line(img)
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assert len(tf.hough_line_peaks(hspace, angles, dists,
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min_angle=45)[0]) == 2
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assert len(tf.hough_line_peaks(hspace, angles, dists,
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min_angle=90)[0]) == 1
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theta = np.linspace(0, np.pi, 100)
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hspace, angles, dists = tf.hough_line(img, theta)
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assert len(tf.hough_line_peaks(hspace, angles, dists,
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min_angle=45)[0]) == 2
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assert len(tf.hough_line_peaks(hspace, angles, dists,
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min_angle=90)[0]) == 1
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theta = np.linspace(np.pi / 3, 4. / 3 * np.pi, 100)
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hspace, angles, dists = tf.hough_line(img, theta)
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assert len(tf.hough_line_peaks(hspace, angles, dists,
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min_angle=45)[0]) == 2
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assert len(tf.hough_line_peaks(hspace, angles, dists,
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min_angle=90)[0]) == 1
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def test_hough_line_peaks_num():
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img = np.zeros((100, 100), dtype=np.bool_)
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img[:, 30] = True
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img[:, 40] = True
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hspace, angles, dists = tf.hough_line(img)
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assert len(tf.hough_line_peaks(hspace, angles, dists, min_distance=0,
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min_angle=0, num_peaks=1)[0]) == 1
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@test_parallel()
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def test_hough_circle():
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# Prepare picture
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img = np.zeros((120, 100), dtype=int)
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radius = 20
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x_0, y_0 = (99, 50)
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y, x = circle_perimeter(y_0, x_0, radius)
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img[x, y] = 1
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out1 = tf.hough_circle(img, radius)
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out2 = tf.hough_circle(img, [radius])
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assert_equal(out1, out2)
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out = tf.hough_circle(img, np.array([radius], dtype=np.intp))
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assert_equal(out, out1)
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x, y = np.where(out[0] == out[0].max())
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assert_equal(x[0], x_0)
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assert_equal(y[0], y_0)
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def test_hough_circle_extended():
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# Prepare picture
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# The circle center is outside the image
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img = np.zeros((100, 100), dtype=int)
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radius = 20
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x_0, y_0 = (-5, 50)
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y, x = circle_perimeter(y_0, x_0, radius)
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img[x[np.where(x > 0)], y[np.where(x > 0)]] = 1
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out = tf.hough_circle(img, np.array([radius], dtype=np.intp),
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full_output=True)
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x, y = np.where(out[0] == out[0].max())
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# Offset for x_0, y_0
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assert_equal(x[0], x_0 + radius)
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assert_equal(y[0], y_0 + radius)
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def test_hough_ellipse_zero_angle():
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img = np.zeros((25, 25), dtype=int)
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rx = 6
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ry = 8
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x0 = 12
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y0 = 15
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angle = 0
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rr, cc = ellipse_perimeter(y0, x0, ry, rx)
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img[rr, cc] = 1
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result = tf.hough_ellipse(img, threshold=9)
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best = result[-1]
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assert_equal(best[1], y0)
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assert_equal(best[2], x0)
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assert_almost_equal(best[3], ry, decimal=1)
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assert_almost_equal(best[4], rx, decimal=1)
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assert_equal(best[5], angle)
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# Check if I re-draw the ellipse, points are the same!
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# ie check API compatibility between hough_ellipse and ellipse_perimeter
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rr2, cc2 = ellipse_perimeter(y0, x0, int(best[3]), int(best[4]),
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orientation=best[5])
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assert_equal(rr, rr2)
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assert_equal(cc, cc2)
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def test_hough_ellipse_non_zero_posangle1():
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# ry > rx, angle in [0:pi/2]
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img = np.zeros((30, 24), dtype=int)
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rx = 6
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ry = 12
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x0 = 10
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y0 = 15
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angle = np.pi / 1.35
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rr, cc = ellipse_perimeter(y0, x0, ry, rx, orientation=angle)
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img[rr, cc] = 1
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result = tf.hough_ellipse(img, threshold=15, accuracy=3)
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result.sort(order='accumulator')
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best = result[-1]
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assert_almost_equal(best[1] / 100., y0 / 100., decimal=1)
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assert_almost_equal(best[2] / 100., x0 / 100., decimal=1)
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assert_almost_equal(best[3] / 10., ry / 10., decimal=1)
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assert_almost_equal(best[4] / 100., rx / 100., decimal=1)
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assert_almost_equal(best[5], angle, decimal=1)
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# Check if I re-draw the ellipse, points are the same!
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# ie check API compatibility between hough_ellipse and ellipse_perimeter
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rr2, cc2 = ellipse_perimeter(y0, x0, int(best[3]), int(best[4]),
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orientation=best[5])
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assert_equal(rr, rr2)
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assert_equal(cc, cc2)
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def test_hough_ellipse_non_zero_posangle2():
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# ry < rx, angle in [0:pi/2]
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img = np.zeros((30, 24), dtype=int)
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rx = 12
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ry = 6
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x0 = 10
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y0 = 15
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angle = np.pi / 1.35
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rr, cc = ellipse_perimeter(y0, x0, ry, rx, orientation=angle)
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img[rr, cc] = 1
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result = tf.hough_ellipse(img, threshold=15, accuracy=3)
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result.sort(order='accumulator')
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best = result[-1]
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assert_almost_equal(best[1] / 100., y0 / 100., decimal=1)
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assert_almost_equal(best[2] / 100., x0 / 100., decimal=1)
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assert_almost_equal(best[3] / 10., ry / 10., decimal=1)
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assert_almost_equal(best[4] / 100., rx / 100., decimal=1)
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assert_almost_equal(best[5], angle, decimal=1)
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# Check if I re-draw the ellipse, points are the same!
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# ie check API compatibility between hough_ellipse and ellipse_perimeter
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rr2, cc2 = ellipse_perimeter(y0, x0, int(best[3]), int(best[4]),
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orientation=best[5])
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assert_equal(rr, rr2)
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assert_equal(cc, cc2)
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def test_hough_ellipse_non_zero_posangle3():
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# ry < rx, angle in [pi/2:pi]
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img = np.zeros((30, 24), dtype=int)
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rx = 12
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ry = 6
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x0 = 10
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y0 = 15
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angle = np.pi / 1.35 + np.pi / 2.
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rr, cc = ellipse_perimeter(y0, x0, ry, rx, orientation=angle)
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img[rr, cc] = 1
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result = tf.hough_ellipse(img, threshold=15, accuracy=3)
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result.sort(order='accumulator')
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best = result[-1]
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# Check if I re-draw the ellipse, points are the same!
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# ie check API compatibility between hough_ellipse and ellipse_perimeter
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rr2, cc2 = ellipse_perimeter(y0, x0, int(best[3]), int(best[4]),
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orientation=best[5])
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assert_equal(rr, rr2)
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assert_equal(cc, cc2)
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def test_hough_ellipse_non_zero_posangle4():
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# ry < rx, angle in [pi:3pi/4]
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img = np.zeros((30, 24), dtype=int)
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rx = 12
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ry = 6
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x0 = 10
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y0 = 15
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angle = np.pi / 1.35 + np.pi
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rr, cc = ellipse_perimeter(y0, x0, ry, rx, orientation=angle)
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img[rr, cc] = 1
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result = tf.hough_ellipse(img, threshold=15, accuracy=3)
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result.sort(order='accumulator')
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best = result[-1]
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# Check if I re-draw the ellipse, points are the same!
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# ie check API compatibility between hough_ellipse and ellipse_perimeter
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rr2, cc2 = ellipse_perimeter(y0, x0, int(best[3]), int(best[4]),
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orientation=best[5])
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assert_equal(rr, rr2)
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assert_equal(cc, cc2)
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def test_hough_ellipse_non_zero_negangle1():
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# ry > rx, angle in [0:-pi/2]
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img = np.zeros((30, 24), dtype=int)
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rx = 6
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ry = 12
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x0 = 10
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y0 = 15
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angle = - np.pi / 1.35
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rr, cc = ellipse_perimeter(y0, x0, ry, rx, orientation=angle)
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img[rr, cc] = 1
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result = tf.hough_ellipse(img, threshold=15, accuracy=3)
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result.sort(order='accumulator')
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best = result[-1]
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# Check if I re-draw the ellipse, points are the same!
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# ie check API compatibility between hough_ellipse and ellipse_perimeter
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rr2, cc2 = ellipse_perimeter(y0, x0, int(best[3]), int(best[4]),
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orientation=best[5])
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assert_equal(rr, rr2)
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assert_equal(cc, cc2)
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def test_hough_ellipse_non_zero_negangle2():
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# ry < rx, angle in [0:-pi/2]
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img = np.zeros((30, 24), dtype=int)
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rx = 12
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ry = 6
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x0 = 10
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y0 = 15
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angle = - np.pi / 1.35
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rr, cc = ellipse_perimeter(y0, x0, ry, rx, orientation=angle)
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img[rr, cc] = 1
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result = tf.hough_ellipse(img, threshold=15, accuracy=3)
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result.sort(order='accumulator')
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best = result[-1]
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# Check if I re-draw the ellipse, points are the same!
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# ie check API compatibility between hough_ellipse and ellipse_perimeter
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rr2, cc2 = ellipse_perimeter(y0, x0, int(best[3]), int(best[4]),
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orientation=best[5])
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assert_equal(rr, rr2)
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assert_equal(cc, cc2)
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def test_hough_ellipse_non_zero_negangle3():
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# ry < rx, angle in [-pi/2:-pi]
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img = np.zeros((30, 24), dtype=int)
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rx = 12
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ry = 6
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x0 = 10
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y0 = 15
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angle = - np.pi / 1.35 - np.pi / 2.
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rr, cc = ellipse_perimeter(y0, x0, ry, rx, orientation=angle)
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img[rr, cc] = 1
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result = tf.hough_ellipse(img, threshold=15, accuracy=3)
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result.sort(order='accumulator')
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best = result[-1]
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# Check if I re-draw the ellipse, points are the same!
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# ie check API compatibility between hough_ellipse and ellipse_perimeter
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rr2, cc2 = ellipse_perimeter(y0, x0, int(best[3]), int(best[4]),
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orientation=best[5])
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assert_equal(rr, rr2)
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assert_equal(cc, cc2)
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def test_hough_ellipse_non_zero_negangle4():
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# ry < rx, angle in [-pi:-3pi/4]
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img = np.zeros((30, 24), dtype=int)
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rx = 12
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ry = 6
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x0 = 10
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y0 = 15
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angle = - np.pi / 1.35 - np.pi
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rr, cc = ellipse_perimeter(y0, x0, ry, rx, orientation=angle)
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img[rr, cc] = 1
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result = tf.hough_ellipse(img, threshold=15, accuracy=3)
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result.sort(order='accumulator')
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best = result[-1]
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# Check if I re-draw the ellipse, points are the same!
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# ie check API compatibility between hough_ellipse and ellipse_perimeter
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rr2, cc2 = ellipse_perimeter(y0, x0, int(best[3]), int(best[4]),
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orientation=best[5])
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assert_equal(rr, rr2)
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assert_equal(cc, cc2)
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if __name__ == "__main__":
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np.testing.run_module_suite()
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