Add cv::logPolar, cv::linearPolar, and a python example

samples/python2/logpolar.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+import cv2
+
+if __name__ == '__main__':
+    import sys
+    try:
+        fn = sys.argv[1]
+    except:
+        fn = '../cpp/fruits.jpg'
+
+    img = cv2.imread(fn)
+    if img is None:
+        print 'Failed to load image file:', fn
+        sys.exit(1)
+
+    img2 = cv2.logPolar(img, (img.shape[0]/2, img.shape[1]/2), 40, cv2.WARP_FILL_OUTLIERS)
+    img3 = cv2.linearPolar(img, (img.shape[0]/2, img.shape[1]/2), 40, cv2.WARP_FILL_OUTLIERS)
+
+    cv2.imshow('before', img)
+    cv2.imshow('logpolar', img2)
+    cv2.imshow('linearpolar', img3)
+
+    cv2.waitKey(0)