More fixes for iterators-are-pointers case

modules/calib3d/src/checkchessboard.cpp

@@ -55,15 +55,12 @@ static void icvGetQuadrangleHypotheses(const std::vector<std::vector< cv::Point
     const float max_aspect_ratio = 3.0f;
     const float min_box_size = 10.0f;
 
-    typedef std::vector< std::vector< cv::Point > >::const_iterator iter_t;
-    iter_t i;
-    for (i = contours.begin(); i != contours.end(); ++i)
+    for (size_t i = 0; i < contours.size(); ++i)
     {
-        const iter_t::difference_type idx = i - contours.begin();
-        if (hierarchy.at(idx)[3] != -1)
+        if (hierarchy.at(i)[3] != -1)
             continue; // skip holes
 
-        const std::vector< cv::Point > & c = *i;
+        const std::vector< cv::Point > & c = contours[i];
         cv::RotatedRect box = cv::minAreaRect(c);
 
         float box_size = MAX(box.size.width, box.size.height);

modules/objdetect/src/aruco/apriltag/apriltag_quad_thresh.cpp

@@ -349,7 +349,7 @@ int quad_segment_maxima(const DetectorParameters &td, int sz, struct line_fit_pt
             }
             y[iy] = acc;
         }
-        copy(y.begin(), y.end(), errs.begin());
+        std::copy(y.begin(), y.end(), errs.begin());
     }
 
     std::vector<int> maxima(sz);