Add dft python test, fix platform depended result in morphology test

modules/python/test/test.py

@@ -17,19 +17,6 @@ import numpy as np
 import cv2
 import argparse
 
-# local test modules
-from test_digits import digits_test
-from test_calibration import calibration_test
-from test_squares import squares_test
-from test_texture_flow import texture_flow_test
-from test_fitline import fitline_test
-from test_houghcircles import houghcircles_test
-from test_houghlines import houghlines_test
-from test_gaussian_mix import gaussian_mix_test
-from test_facedetect import facedetect_test
-from test_kmeans import kmeans_test
-from test_morphology import morphology_test
-
 # Python 3 moved urlopen to urllib.requests
 try:
     from urllib.request import urlopen
@@ -40,6 +27,12 @@ from tests_common import NewOpenCVTests
 
 # Tests to run first; check the handful of basic operations that the later tests rely on
 
+basedir = os.path.abspath(os.path.dirname(__file__))
+
+def load_tests(loader, tests, pattern):
+    tests.addTests(loader.discover(basedir, pattern='test_*.py'))
+    return tests
+
 class Hackathon244Tests(NewOpenCVTests):
 
     def test_int_array(self):

modules/python/test/test_calibration.py

@@ -11,7 +11,6 @@ from __future__ import print_function
 import numpy as np
 import cv2
 
-
 from tests_common import NewOpenCVTests
 
 class calibration_test(NewOpenCVTests):

modules/python/test/test_dft.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python
+
+'''
+Test for disctrete fourier transform (dft)
+'''
+
+# Python 2/3 compatibility
+from __future__ import print_function
+
+import cv2
+import numpy as np
+import sys
+
+from tests_common import NewOpenCVTests
+
+class dft_test(NewOpenCVTests):
+    def test_dft(self):
+
+        img = self.get_sample('samples/data/rubberwhale1.png', 0)
+        eps = 0.001
+
+        #test direct transform
+        refDft = np.fft.fft2(img)
+        refDftShift = np.fft.fftshift(refDft)
+        refMagnitide = np.log(1.0 + np.abs(refDftShift))
+
+        testDft = cv2.dft(np.float32(img),flags = cv2.DFT_COMPLEX_OUTPUT)
+        testDftShift = np.fft.fftshift(testDft)
+        testMagnitude = np.log(1.0 + cv2.magnitude(testDftShift[:,:,0], testDftShift[:,:,1]))
+
+        refMagnitide = cv2.normalize(refMagnitide, 0.0, 1.0, cv2.NORM_MINMAX)
+        testMagnitude = cv2.normalize(testMagnitude, 0.0, 1.0, cv2.NORM_MINMAX)
+
+        self.assertLess(cv2.norm(refMagnitide - testMagnitude), eps)
+
+        #test inverse transform
+        img_back = np.fft.ifft2(refDft)
+        img_back = np.abs(img_back)
+
+        img_backTest = cv2.idft(testDft)
+        img_backTest = cv2.magnitude(img_backTest[:,:,0], img_backTest[:,:,1])
+
+        img_backTest = cv2.normalize(img_backTest, 0.0, 1.0, cv2.NORM_MINMAX)
+        img_back = cv2.normalize(img_back, 0.0, 1.0, cv2.NORM_MINMAX)
+
+        self.assertLess(cv2.norm(img_back - img_backTest), eps)

modules/python/test/test_morphology.py

@@ -18,14 +18,14 @@ class morphology_test(NewOpenCVTests):
 
     def test_morphology(self):
 
-        fn = 'samples/data/baboon.jpg'
+        fn = 'samples/data/rubberwhale1.png'
         img = self.get_sample(fn)
 
         modes = ['erode/dilate', 'open/close', 'blackhat/tophat', 'gradient']
         str_modes = ['ellipse', 'rect', 'cross']
 
-        referenceHashes = { modes[0]: '1bd14fc814e41b80ce7816bc04f60b65', modes[1] : '1bd14fc814e41b80ce7816bc04f60b65',
-            modes[2] : 'cb18a5d28e77522dfec6a6255bc3847e', modes[3] : '84909517e4866aa079f4b2e2906bf47b'}
+        referenceHashes = { modes[0]: '071a526425b79e45b4d0d71ef51b0562', modes[1] : '071a526425b79e45b4d0d71ef51b0562',
+            modes[2] : '427e89f581b7df1b60a831b1ed4c8618', modes[3] : '0dd8ad251088a63d0dd022bcdc57361c'}
 
         def update(cur_mode):
             cur_str_mode = str_modes[0]