Replace "const InputArray" with "InputArray".

InputArray is a reference, and references are always constant anyway. Making
it const even causes a GCC warning.

modules/imgproc/include/opencv2/imgproc.hpp

@@ -859,7 +859,7 @@ public:
  *                              * 1 corresponds to 0.1 mean false alarms
  *                          This vector will be calculated _only_ when the objects type is REFINE_ADV
  */
-    virtual void detect(const InputArray _image, OutputArray _lines,
+    virtual void detect(InputArray _image, OutputArray _lines,
                         OutputArray width = noArray(), OutputArray prec = noArray(),
                         OutputArray nfa = noArray()) = 0;
 
@@ -870,7 +870,7 @@ public:
  *                  Should have the size of the image, where the lines were found
  * @param lines     The lines that need to be drawn
  */
-    virtual void drawSegments(InputOutputArray image, const InputArray lines) = 0;
+    virtual void drawSegments(InputOutputArray image, InputArray lines) = 0;
 
 /**
  * Draw both vectors on the image canvas. Uses blue for lines 1 and red for lines 2.
@@ -881,7 +881,7 @@ public:
  * @param lines2    The second lines that need to be drawn. Color - Red.
  * @return          The number of mismatching pixels between lines1 and lines2.
  */
-    virtual int compareSegments(const Size& size, const InputArray lines1, const InputArray lines2, Mat* image = 0) = 0;
+    virtual int compareSegments(const Size& size, InputArray lines1, InputArray lines2, Mat* image = 0) = 0;
 
     virtual ~LineSegmentDetector() {};
 };

modules/imgproc/src/lsd.cpp

@@ -205,7 +205,7 @@ public:
  *                              * 1 corresponds to 0.1 mean false alarms
  *                          This vector will be calculated _only_ when the objects type is REFINE_ADV
  */
-    void detect(const InputArray _image, OutputArray _lines,
+    void detect(InputArray _image, OutputArray _lines,
                 OutputArray width = noArray(), OutputArray prec = noArray(),
                 OutputArray nfa = noArray());
 
@@ -216,7 +216,7 @@ public:
  *                  Should have the size of the image, where the lines were found
  * @param lines     The lines that need to be drawn
  */
-    void drawSegments(InputOutputArray image, const InputArray lines);
+    void drawSegments(InputOutputArray image, InputArray lines);
 
 /**
  * Draw both vectors on the image canvas. Uses blue for lines 1 and red for lines 2.
@@ -227,7 +227,7 @@ public:
  * @param lines2    The second lines that need to be drawn. Color - Red.
  * @return          The number of mismatching pixels between lines1 and lines2.
  */
-    int compareSegments(const Size& size, const InputArray lines1, const InputArray lines2, Mat* image = 0);
+    int compareSegments(const Size& size, InputArray lines1, InputArray lines2, Mat* image = 0);
 
 private:
     Mat image;