Improvement of array of equivalences’ upper bound + fix some wrong comments

modules/imgproc/src/connectedcomponents.cpp

@@ -288,7 +288,7 @@ namespace cv{
                 int r = range.start;
                 chunksSizeAndLabels_[r] = range.end;
 
-                LabelT label = LabelT((r * imgLabels_.cols + 1) / 2 + 1);
+                LabelT label = LabelT((r + 1) / 2)  * LabelT((imgLabels_.cols + 1) / 2) + 1;
 
                 const LabelT firstLabel = label;
                 const int w = img_.cols;
@@ -615,6 +615,10 @@ namespace cv{
 
                 //merge labels of different chunks
                 mergeLabels8Connectivity(imgLabels, P, chunksSizeAndLabels);
+
+                for (int i = 0; i < h; i = chunksSizeAndLabels[i]){
+                    flattenL(P, int((i + 1) / 2) * int((w + 1) / 2) + 1, chunksSizeAndLabels[i + 1], nLabels);
+                }
             }
             else{
                 //First scan, each thread works with chunk of img.rows/nThreads rows
@@ -623,10 +627,10 @@ namespace cv{
 
                 //merge labels of different chunks
                 mergeLabels4Connectivity(imgLabels, P, chunksSizeAndLabels);
-            }
-
-            for (int i = 0; i < h; i = chunksSizeAndLabels[i]){
-                flattenL(P, (i * w + 1) / 2 + 1, chunksSizeAndLabels[i + 1], nLabels);
+                
+                for (int i = 0; i < h; i = chunksSizeAndLabels[i]){
+                    flattenL(P, int(i * w + 1) / 2 + 1, chunksSizeAndLabels[i + 1], nLabels);
+                }
             }
 
             //Array for statistics dataof threads
@@ -842,7 +846,7 @@ namespace cv{
 
                 chunksSizeAndLabels_[r] = range.end + (range.end % 2);
 
-                LabelT label = LabelT((r + 1) * (imgLabels_.cols + 1) / 4);
+                LabelT label = LabelT((r + 1) / 2)  * LabelT((imgLabels_.cols + 1) / 2) + 1;
 
                 const LabelT firstLabel = label;
                 const int h = img_.rows, w = img_.cols;
@@ -2540,7 +2544,7 @@ namespace cv{
             //0 0 0 0 0...
             //1 0 1 0 1...
             //............
-            const size_t Plength = ((size_t(h) + 1) * (size_t(w) + 1)) / 4 + 1;
+            const size_t Plength = size_t(((h + 1) / 2) * size_t((w + 1) / 2)) + 1;
 
             //Array used to store info and labeled pixel by each thread.
             //Different threads affect different memory location of chunksSizeAndLabels
@@ -2562,7 +2566,7 @@ namespace cv{
 
             LabelT nLabels = 1;
             for (int i = 0; i < h; i = chunksSizeAndLabels[i]){
-                flattenL(P, (i + 1) * (w + 1) / 4, chunksSizeAndLabels[i + 1], nLabels);
+                flattenL(P, LabelT((i + 1) / 2) * LabelT((w + 1) / 2) + 1, chunksSizeAndLabels[i + 1], nLabels);
             }
 
             //Array for statistics data
@@ -2602,7 +2606,7 @@ namespace cv{
             //0 0 0 0 0...
             //1 0 1 0 1...
             //............
-            const size_t Plength = ((size_t(h) + 1) * (size_t(w) + 1)) / 4 + 1;
+            const size_t Plength = size_t(((h + 1) / 2) * size_t((w + 1) / 2)) + 1;
 
             LabelT *P = (LabelT *)fastMalloc(sizeof(LabelT) *Plength);
             P[0] = 0;

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

@@ -235,7 +235,7 @@ 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,