Update radon_transform.cpp

Author: sturkmen72

modules/ximgproc/src/radon_transform.cpp

@@ -34,7 +34,7 @@ namespace cv {namespace ximgproc {
         if (crop) {
             // crop the source into square
             _row_num = min(_srcMat.rows, _srcMat.cols);
-            cv::Rect _crop_ROI(
+            Rect _crop_ROI(
                 _srcMat.cols / 2 - _row_num / 2,
                 _srcMat.rows / 2 - _row_num / 2,
                 _row_num, _row_num);
@@ -58,23 +58,28 @@ namespace cv {namespace ximgproc {
 
         double _t;
         Mat _rotated_src;
+        Mat _radon(_row_num, _col_num, _out_mat_type);
 
-        // Initialize dst with appropriate size and type
-        dst.create(_row_num, _col_num, _out_mat_type);
-        Mat _radon = dst.getMat(); // Get reference to the output matrix
+        // Define the parallel loop as a lambda function
+        cv::parallel_for_(Range(0, _col_num), [&](const Range& range) {
+            for (int _col = range.start; _col < range.end; _col++) {
+                // rotate the source by _t
+                double _t = (start_angle + _col * theta);
+                Mat _r_matrix = getRotationMatrix2D(_center, _t, 1);
 
-        for (int _col = 0; _col < _col_num; _col++) {
-            // rotate the source by _t
-            _t = (start_angle + _col * theta);
-            cv::Mat _r_matrix = cv::getRotationMatrix2D(_center, _t, 1);
-            cv::warpAffine(_masked_src, _rotated_src, _r_matrix, _masked_src.size());
-            Mat _col_mat = _radon.col(_col);
-            // make projection
-            cv::reduce(_rotated_src, _col_mat, 1, REDUCE_SUM, _out_mat_type);
-        }
+                Mat _rotated_src;
+                warpAffine(_masked_src, _rotated_src, _r_matrix, _masked_src.size());
+
+                Mat _col_mat = _radon.col(_col);
+                // make projection
+                reduce(_rotated_src, _col_mat, 1, REDUCE_SUM, _out_mat_type);
+            }
+            });
 
         if (norm) {
             normalize(_radon, _radon, 0, 255, NORM_MINMAX, CV_8UC1);
         }
+
+        _radon.copyTo(dst);
     }
 } }