def test_get_match_coords(self):
''' Shall find matching coordinates '''
img1 = get_uint8_image(self.img1, self.imgMin, self.imgMax)
img2 = get_uint8_image(self.img2, self.imgMin, self.imgMax)
keyPoints1, descr1 = find_key_points(img1, nFeatures=self.nFeatures)
keyPoints2, descr2 = find_key_points(img2, nFeatures=self.nFeatures)
x1, y1, x2, y2 = get_match_coords(keyPoints1, descr1,
keyPoints2, descr2)
self.assertTrue(len(keyPoints1) > len(x1))
self.assertTrue(len(keyPoints2) > len(x2))
def test_lstsq_filter(self):
''' Shall filter out not matching points '''
img1 = get_uint8_image(self.img1, self.imgMin, self.imgMax)
img2 = get_uint8_image(self.img2, self.imgMin, self.imgMax)
keyPoints1, descr1 = find_key_points(img1, nFeatures=self.nFeatures)
keyPoints2, descr2 = find_key_points(img2, nFeatures=self.nFeatures)
x1, y1, x2, y2 = get_match_coords(keyPoints1, descr1,
keyPoints2, descr2)
x1f, y1f, x2f, y2f = lstsq_filter(x1, y1, x2, y2)
self.assertTrue(len(x1) > len(x1f))
def test_max_drift_filter(self):
'''Shall keep only slow drift '''
maxSpeed = 30 # km
img1 = get_uint8_image(self.img1, self.imgMin, self.imgMax)
img2 = get_uint8_image(self.img2, self.imgMin, self.imgMax)
keyPoints1, descr1 = find_key_points(img1, nFeatures=self.nFeatures)
keyPoints2, descr2 = find_key_points(img2, nFeatures=self.nFeatures)
x1, y1, x2, y2 = get_match_coords(keyPoints1, descr1,
keyPoints2, descr2)
x1f, y1f, x2f, y2f = max_drift_filter(self.n1, x1, y1,
self.n2, x2, y2)
self.assertTrue(len(x1f) < len(x1))
def test_get_displacement_pix(self):
''' Shall find matching coordinates and plot quiver in pixel/line'''
img1 = get_uint8_image(self.img1, self.imgMin, self.imgMax)
img2 = get_uint8_image(self.img2, self.imgMin, self.imgMax)
keyPoints1, descr1 = find_key_points(img1, nFeatures=self.nFeatures)
keyPoints2, descr2 = find_key_points(img2, nFeatures=self.nFeatures)
x1, y1, x2, y2 = get_match_coords(keyPoints1, descr1,
keyPoints2, descr2)
u, v = get_displacement_pix(self.n1, x1, y1, self.n2, x2, y2)
plt.quiver(x1, y1, u, v)
plt.savefig('sea_ice_drift_tests_02_quiver_pixlin.png')
plt.close('all')
self.assertTrue(len(u) == len(x1))
def test_get_displacement_km(self):
''' Shall find matching coordinates and plot quiver in lon/lat'''
img1 = get_uint8_image(self.img1, self.imgMin, self.imgMax)
img2 = get_uint8_image(self.img2, self.imgMin, self.imgMax)
keyPoints1, descr1 = find_key_points(img1, nFeatures=self.nFeatures)
keyPoints2, descr2 = find_key_points(img2, nFeatures=self.nFeatures)
x1, y1, x2, y2 = get_match_coords(keyPoints1, descr1,
keyPoints2, descr2)
u, v = get_displacement_km(self.n1, x1, y1, self.n2, x2, y2)
lon1, lat1 = self.n1.transform_points(x1, y1)
plt.quiver(lon1, lat1, u, v)
plt.savefig('sea_ice_drift_tests_01_quiver_lonlat.png')
plt.close('all')
self.assertTrue(len(u) == len(x1))
