fix are calc for polygon

ppocr/data/imaug/make_shrink_map.py

@@ -84,11 +84,12 @@ class MakeShrinkMap(object):
         return polygons, ignore_tags
 
     def polygon_area(self, polygon):
-        # return cv2.contourArea(polygon.astype(np.float32))
+        """
-        edge = 0
+        compute polygon area
-        for i in range(polygon.shape[0]):
+        """
-            next_index = (i + 1) % polygon.shape[0]
+        area = 0
-            edge += (polygon[next_index, 0] - polygon[i, 0]) * (
+        q = polygon[-1]
-                polygon[next_index, 1] - polygon[i, 1])
+        for p in polygon:
-
+            area += p[0] * q[1] - p[1] * q[0]
-        return edge / 2.
+            q = p
+        return area / 2.0