Improved documentation and method comment to clarify that LineSegmentDetector::detect method accepts both Vec4i and Vec4f as return vector.

modules/imgproc/include/opencv2/imgproc.hpp

@@ -985,8 +985,8 @@ public:
 
     @param _image A grayscale (CV_8UC1) input image. If only a roi needs to be selected, use:
     `lsd_ptr-\>detect(image(roi), lines, ...); lines += Scalar(roi.x, roi.y, roi.x, roi.y);`
-    @param _lines A vector of Vec4f elements specifying the beginning and ending point of a line. Where
-    Vec4f is (x1, y1, x2, y2), point 1 is the start, point 2 - end. Returned lines are strictly
+    @param _lines A vector of Vec4i or Vec4f elements specifying the beginning and ending point of a line. Where
+    Vec4i/Vec4f is (x1, y1, x2, y2), point 1 is the start, point 2 - end. Returned lines are strictly
     oriented depending on the gradient.
     @param width Vector of widths of the regions, where the lines are found. E.g. Width of line.
     @param prec Vector of precisions with which the lines are found.

modules/imgproc/src/lsd.cpp

@@ -191,8 +191,8 @@ public:
  *                  If only a roi needs to be selected, use
  *                  lsd_ptr->detect(image(roi), ..., lines);
  *                  lines += Scalar(roi.x, roi.y, roi.x, roi.y);
- * @param _lines    Return: A vector of Vec4f elements specifying the beginning and ending point of a line.
- *                          Where Vec4f is (x1, y1, x2, y2), point 1 is the start, point 2 - end.
+ * @param _lines    Return: A vector of Vec4i or Vec4f elements specifying the beginning and ending point of a line.
+ *                          Where Vec4i/Vec4f is (x1, y1, x2, y2), point 1 is the start, point 2 - end.
  *                          Returned lines are strictly oriented depending on the gradient.
  * @param width     Return: Vector of widths of the regions, where the lines are found. E.g. Width of line.
  * @param prec      Return: Vector of precisions with which the lines are found.