opencv
diff --git a/‎modules/imgproc/include/opencv2/imgproc.hpp
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+13Lines changed: 13 additions & 0 deletions b/‎modules/imgproc/include/opencv2/imgproc.hpp
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+13Lines changed: 13 additions & 0 deletions
diff --git a/‎modules/imgproc/include/opencv2/imgproc/detail/legacy.hpp
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+30Lines changed: 30 additions & 0 deletions b/‎modules/imgproc/include/opencv2/imgproc/detail/legacy.hpp
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+30Lines changed: 30 additions & 0 deletions
diff --git a/‎modules/imgproc/src/contours.cpp
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+3-2Lines changed: 3 additions & 2 deletions b/‎modules/imgproc/src/contours.cpp
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+3-2Lines changed: 3 additions & 2 deletions
@@ -4040,6 +4040,19 @@ A program using pyramid scaling, Canny, contours and contour simplification to f
 squares in the input image.
 */
 
+//! @brief Find contours using link runs algorithm
+//!
+//! This function implements an algorithm different from cv::findContours:
+//! - doesn't allocate temporary image internally, thus it has reduced memory consumption
+//! - supports CV_8UC1 images only
+//! - outputs 2-level hierarhy only (RETR_CCOMP mode)
+//! - doesn't support approximation change other than CHAIN_APPROX_SIMPLE
+//! In all other aspects this function is compatible with cv::findContours.
+CV_EXPORTS_W void findContoursLinkRuns(InputArray image, OutputArrayOfArrays contours, OutputArray hierarchy);
+
+//! @overload
+CV_EXPORTS_W void findContoursLinkRuns(InputArray image, OutputArrayOfArrays contours);
+
 /** @brief Approximates a polygonal curve(s) with the specified precision.
 
 The function cv::approxPolyDP approximates a curve or a polygon with another curve/polygon with less
 
@@ -0,0 +1,30 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at https://opencv.org/license.html
+
+#ifndef OPENCV_IMGPROC_DETAIL_LEGACY_HPP
+#define OPENCV_IMGPROC_DETAIL_LEGACY_HPP
+
+#include "opencv2/imgproc.hpp"
+
+namespace cv {
+
+#ifdef __OPENCV_BUILD
+
+CV_EXPORTS void findContours_legacy(InputArray _image,
+                                    OutputArrayOfArrays _contours,
+                                    OutputArray _hierarchy,
+                                    int mode,
+                                    int method,
+                                    Point offset = Point());
+CV_EXPORTS void findContours_legacy(InputArray image,
+                                    OutputArrayOfArrays contours,
+                                    int mode,
+                                    int method,
+                                    Point offset = Point());
+
+#endif
+
+}  // namespace cv
+
+#endif  // OPENCV_IMGPROC_DETAIL_LEGACY_HPP
@@ -40,6 +40,7 @@
 //M*/
 #include "precomp.hpp"
 #include "opencv2/core/hal/intrin.hpp"
+#include "opencv2/imgproc/detail/legacy.hpp"
 
 using namespace cv;
 
@@ -1813,7 +1814,7 @@ cvFindContours( void*  img,  CvMemStorage*  storage,
     return cvFindContours_Impl(img, storage, firstContour, cntHeaderSize, mode, method, offset, 1);
 }
 
-void cv::findContours( InputArray _image, OutputArrayOfArrays _contours,
+void cv::findContours_legacy( InputArray _image, OutputArrayOfArrays _contours,
                    OutputArray _hierarchy, int mode, int method, Point offset )
 {
     CV_INSTRUMENT_REGION();
@@ -1878,7 +1879,7 @@ void cv::findContours( InputArray _image, OutputArrayOfArrays _contours,
     }
 }
 
-void cv::findContours( InputArray _image, OutputArrayOfArrays _contours,
+void cv::findContours_legacy( InputArray _image, OutputArrayOfArrays _contours,
                        int mode, int method, Point offset)
 {
     CV_INSTRUMENT_REGION();
Original file line number	Diff line number	Diff line change
`@@ -40,6 +40,7 @@`
`40`	`40`	`//M*/`
`41`	`41`	`#include "precomp.hpp"`
`42`	`42`	`#include "opencv2/core/hal/intrin.hpp"`
	`43`	`+#include "opencv2/imgproc/detail/legacy.hpp"`
`43`	`44`
`44`	`45`	`using namespace cv;`
`45`	`46`
`@@ -1813,7 +1814,7 @@ cvFindContours( void* img, CvMemStorage* storage,`
`1813`	`1814`	`return cvFindContours_Impl(img, storage, firstContour, cntHeaderSize, mode, method, offset, 1);`
`1814`	`1815`	`}`
`1815`	`1816`
`1816`		`-void cv::findContours( InputArray _image, OutputArrayOfArrays _contours,`
	`1817`	`+void cv::findContours_legacy( InputArray _image, OutputArrayOfArrays _contours,`
`1817`	`1818`	`OutputArray _hierarchy, int mode, int method, Point offset )`
`1818`	`1819`	`{`
`1819`	`1820`	`CV_INSTRUMENT_REGION();`
`@@ -1878,7 +1879,7 @@ void cv::findContours( InputArray _image, OutputArrayOfArrays _contours,`
`1878`	`1879`	`}`
`1879`	`1880`	`}`
`1880`	`1881`
`1881`		`-void cv::findContours( InputArray _image, OutputArrayOfArrays _contours,`
	`1882`	`+void cv::findContours_legacy( InputArray _image, OutputArrayOfArrays _contours,`
`1882`	`1883`	`int mode, int method, Point offset)`
`1883`	`1884`	`{`
`1884`	`1885`	`CV_INSTRUMENT_REGION();`