Merge pull request #8789 from vpisarev:parallel_ccomp

modules/imgproc/include/opencv2/imgproc.hpp

@@ -3703,8 +3703,10 @@ 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 cv::ConnectedComponentsAlgorithmsTypes
+Grana (BBDT) and Wu's (SAUF) algorithms are supported, see the cv::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.
 
 @param image the 8-bit single-channel image to be labeled
 @param labels destination labeled image
@@ -3735,7 +3737,8 @@ consideration based on the total number of labels or alternatively the total num
 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 cv::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.
 
 @param image the 8-bit single-channel image to be labeled
 @param labels destination labeled image

modules/video/include/opencv2/video/background_segm.hpp

@@ -188,7 +188,7 @@ public:
 
     A shadow is detected if pixel is a darker version of the background. The shadow threshold (Tau in
     the paper) is a threshold defining how much darker the shadow can be. Tau= 0.5 means that if a pixel
-    is more than twice darker then it is not shadow. See Prati, Mikic, Trivedi and Cucchiarra,
+    is more than twice darker then it is not shadow. See Prati, Mikic, Trivedi and Cucchiara,
     *Detecting Moving Shadows...*, IEEE PAMI,2003.
      */
     CV_WRAP virtual double getShadowThreshold() const = 0;
@@ -289,7 +289,7 @@ public:
 
     A shadow is detected if pixel is a darker version of the background. The shadow threshold (Tau in
     the paper) is a threshold defining how much darker the shadow can be. Tau= 0.5 means that if a pixel
-    is more than twice darker then it is not shadow. See Prati, Mikic, Trivedi and Cucchiarra,
+    is more than twice darker then it is not shadow. See Prati, Mikic, Trivedi and Cucchiara,
     *Detecting Moving Shadows...*, IEEE PAMI,2003.
      */
     CV_WRAP virtual double getShadowThreshold() const = 0;

modules/video/src/bgfg_KNN.cpp

@@ -236,7 +236,7 @@ protected:
     // Tau - shadow threshold. The shadow is detected if the pixel is darker
     //version of the background. Tau is a threshold on how much darker the shadow can be.
     //Tau= 0.5 means that if pixel is more than 2 times darker then it is not shadow
-    //See: Prati,Mikic,Trivedi,Cucchiarra,"Detecting Moving Shadows...",IEEE PAMI,2003.
+    //See: Prati,Mikic,Trivedi,Cucchiara,"Detecting Moving Shadows...",IEEE PAMI,2003.
 
     //model data
     int nLongCounter;//circular counter

modules/video/src/bgfg_gaussmix2.cpp

@@ -386,7 +386,7 @@ protected:
     // Tau - shadow threshold. The shadow is detected if the pixel is darker
     //version of the background. Tau is a threshold on how much darker the shadow can be.
     //Tau= 0.5 means that if pixel is more than 2 times darker then it is not shadow
-    //See: Prati,Mikic,Trivedi,Cucchiarra,"Detecting Moving Shadows...",IEEE PAMI,2003.
+    //See: Prati,Mikic,Trivedi,Cucchiara,"Detecting Moving Shadows...",IEEE PAMI,2003.
 
     String name_;
 
@@ -461,7 +461,7 @@ struct GaussBGStatModel2Params
     // Tau - shadow threshold. The shadow is detected if the pixel is darker
     //version of the background. Tau is a threshold on how much darker the shadow can be.
     //Tau= 0.5 means that if pixel is more than 2 times darker then it is not shadow
-    //See: Prati,Mikic,Trivedi,Cucchiarra,"Detecting Moving Shadows...",IEEE PAMI,2003.
+    //See: Prati,Mikic,Trivedi,Cucchiara,"Detecting Moving Shadows...",IEEE PAMI,2003.
 };
 
 struct GMM
@@ -472,7 +472,7 @@ struct GMM
 
 // shadow detection performed per pixel
 // should work for rgb data, could be usefull for gray scale and depth data as well
-// See: Prati,Mikic,Trivedi,Cucchiarra,"Detecting Moving Shadows...",IEEE PAMI,2003.
+// See: Prati,Mikic,Trivedi,Cucchiara,"Detecting Moving Shadows...",IEEE PAMI,2003.
 CV_INLINE bool
 detectShadowGMM(const float* data, int nchannels, int nmodes,
                 const GMM* gmm, const float* mean,