add part of opencv

Lib/opencv/sources/samples/python/logpolar.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+
+'''
+plots image as logPolar and linearPolar
+
+Usage:
+    logpolar.py
+
+Keys:
+    ESC    - exit
+'''
+
+# Python 2/3 compatibility
+from __future__ import print_function
+
+import numpy as np
+import cv2 as cv
+
+def main():
+    import sys
+    try:
+        fn = sys.argv[1]
+    except IndexError:
+        fn = 'fruits.jpg'
+
+    img = cv.imread(cv.samples.findFile(fn))
+    if img is None:
+        print('Failed to load image file:', fn)
+        sys.exit(1)
+
+    img2 = cv.logPolar(img, (img.shape[0]/2, img.shape[1]/2), 40, cv.WARP_FILL_OUTLIERS)
+    img3 = cv.linearPolar(img, (img.shape[0]/2, img.shape[1]/2), 40, cv.WARP_FILL_OUTLIERS)
+
+    cv.imshow('before', img)
+    cv.imshow('logpolar', img2)
+    cv.imshow('linearpolar', img3)
+
+    cv.waitKey(0)
+    print('Done')
+
+
+if __name__ == '__main__':
+    print(__doc__)
+    main()
+    cv.destroyAllWindows()