Merge pull request opencv#17913 from asmorkalov:as/connected_components_ref

Author: mshabunin

doc/opencv.bib

@@ -1215,3 +1215,16 @@ @article{yang1996structure
   year = {1996},
   publisher = {Elsevier}
 }
+@Article{Wu2009,
+  author={Wu, Kesheng
+  and Otoo, Ekow
+  and Suzuki, Kenji},
+  title={Optimizing two-pass connected-component labeling algorithms},
+  journal={Pattern Analysis and Applications},
+  year={2009},
+  month={Jun},
+  day={01},
+  volume={12},
+  number={2},
+  pages={117-135},
+}

modules/imgproc/include/opencv2/imgproc.hpp

@@ -403,7 +403,7 @@ enum ConnectedComponentsTypes {
 
 //! connected components algorithm
 enum ConnectedComponentsAlgorithmsTypes {
-    CCL_WU      = 0,  //!< SAUF algorithm for 8-way connectivity, SAUF algorithm for 4-way connectivity
+    CCL_WU      = 0,  //!< SAUF @cite Wu2009 algorithm for 8-way connectivity, SAUF algorithm for 4-way connectivity
     CCL_DEFAULT = -1, //!< BBDT algorithm for 8-way connectivity, SAUF algorithm for 4-way connectivity
     CCL_GRANA   = 1   //!< BBDT algorithm for 8-way connectivity, SAUF algorithm for 4-way connectivity
 };
@@ -3842,7 +3842,7 @@ image with 4 or 8 way connectivity - returns N, the total number of labels [0, N
 represents the background label. ltype specifies the output label image type, an important
 consideration based on the total number of labels or alternatively the total number of pixels in
 the source image. ccltype specifies the connected components labeling algorithm to use, currently
-Grana (BBDT) and Wu's (SAUF) algorithms are supported, see the #ConnectedComponentsAlgorithmsTypes
+Grana (BBDT) and Wu's (SAUF) @cite Wu2009 algorithms are supported, see the #ConnectedComponentsAlgorithmsTypes
 for details. Note that SAUF algorithm forces a row major ordering of labels while BBDT does not.
 This function uses parallel version of both Grana and Wu's algorithms if at least one allowed
 parallel framework is enabled and if the rows of the image are at least twice the number returned by #getNumberOfCPUs.
@@ -3874,7 +3874,7 @@ image with 4 or 8 way connectivity - returns N, the total number of labels [0, N
 represents the background label. ltype specifies the output label image type, an important
 consideration based on the total number of labels or alternatively the total number of pixels in
 the source image. ccltype specifies the connected components labeling algorithm to use, currently
-Grana's (BBDT) and Wu's (SAUF) algorithms are supported, see the #ConnectedComponentsAlgorithmsTypes
+Grana's (BBDT) and Wu's (SAUF) @cite Wu2009 algorithms are supported, see the #ConnectedComponentsAlgorithmsTypes
 for details. Note that SAUF algorithm forces a row major ordering of labels while BBDT does not.
 This function uses parallel version of both Grana and Wu's algorithms (statistics included) if at least one allowed
 parallel framework is enabled and if the rows of the image are at least twice the number returned by #getNumberOfCPUs.