diff --git a/modules/calib3d/src/ptsetreg.cpp b/modules/calib3d/src/ptsetreg.cpp
index e83e19a20..f41769654 100644
--- a/modules/calib3d/src/ptsetreg.cpp
+++ b/modules/calib3d/src/ptsetreg.cpp
@@ -206,7 +206,7 @@ public:
 
         for( iter = 0; iter < niters; iter++ )
         {
-            int i, goodCount, nmodels;
+            int i, nmodels;
             if( count > modelPoints )
             {
                 bool found = getSubset( m1, m2, ms1, ms2, rng, 10000 );
@@ -227,7 +227,7 @@ public:
             for( i = 0; i < nmodels; i++ )
             {
                 Mat model_i = model.rowRange( i*modelSize.height, (i+1)*modelSize.height );
-                goodCount = findInliers( m1, m2, model_i, err, mask, threshold );
+                int goodCount = findInliers( m1, m2, model_i, err, mask, threshold );
 
                 if( goodCount > MAX(maxGoodCount, modelPoints-1) )
                 {
@@ -284,7 +284,7 @@ public:
         int d1 = m1.channels() > 1 ? m1.channels() : m1.cols;
         int d2 = m2.channels() > 1 ? m2.channels() : m2.cols;
         int count = m1.checkVector(d1), count2 = m2.checkVector(d2);
-        double minMedian = DBL_MAX, sigma;
+        double minMedian = DBL_MAX;
 
         RNG rng((uint64)-1);
 
@@ -359,7 +359,7 @@ public:
 
         if( minMedian < DBL_MAX )
         {
-            sigma = 2.5*1.4826*(1 + 5./(count - modelPoints))*std::sqrt(minMedian);
+            double sigma = 2.5*1.4826*(1 + 5./(count - modelPoints))*std::sqrt(minMedian);
             sigma = MAX( sigma, 0.001 );
 
             count = findInliers( m1, m2, bestModel, err, mask, sigma );
diff --git a/modules/videostab/src/motion_stabilizing.cpp b/modules/videostab/src/motion_stabilizing.cpp
index 65bbd73bd..d31c420f6 100644
--- a/modules/videostab/src/motion_stabilizing.cpp
+++ b/modules/videostab/src/motion_stabilizing.cpp
@@ -602,13 +602,12 @@ static inline bool isGoodMotion(const float M[], float w, float h, float dx, flo
 {
     Point2f pt[4] = {Point2f(0,0), Point2f(w,0), Point2f(w,h), Point2f(0,h)};
     Point2f Mpt[4];
-    float z;
 
     for (int i = 0; i < 4; ++i)
     {
         Mpt[i].x = M[0]*pt[i].x + M[1]*pt[i].y + M[2];
         Mpt[i].y = M[3]*pt[i].x + M[4]*pt[i].y + M[5];
-        z = M[6]*pt[i].x + M[7]*pt[i].y + M[8];
+        float z = M[6]*pt[i].x + M[7]*pt[i].y + M[8];
         Mpt[i].x /= z;
         Mpt[i].y /= z;
     }
diff --git a/modules/videostab/src/outlier_rejection.cpp b/modules/videostab/src/outlier_rejection.cpp
index ee37a9303..3ae6e6b27 100644
--- a/modules/videostab/src/outlier_rejection.cpp
+++ b/modules/videostab/src/outlier_rejection.cpp
@@ -84,16 +84,14 @@ void TranslationBasedLocalOutlierRejector::process(
     Size ncells((frameSize.width + cellSize_.width - 1) / cellSize_.width,
                 (frameSize.height + cellSize_.height - 1) / cellSize_.height);
 
-    int cx, cy;
-
     // fill grid cells
 
     grid_.assign(ncells.area(), Cell());
 
     for (int i = 0; i < npoints; ++i)
     {
-        cx = std::min(cvRound(points0_[i].x / cellSize_.width), ncells.width - 1);
-        cy = std::min(cvRound(points0_[i].y / cellSize_.height), ncells.height - 1);
+        int cx = std::min(cvRound(points0_[i].x / cellSize_.width), ncells.width - 1);
+        int cy = std::min(cvRound(points0_[i].y / cellSize_.height), ncells.height - 1);
         grid_[cy * ncells.width + cx].push_back(i);
     }
 
@@ -101,19 +99,16 @@ void TranslationBasedLocalOutlierRejector::process(
 
     RNG rng(0);
     int niters = ransacParams_.niters();
-    int ninliers, ninliersMax;
     std::vector<int> inliers;
-    float dx, dy, dxBest, dyBest;
-    float x1, y1;
-    int idx;
 
     for (size_t ci = 0; ci < grid_.size(); ++ci)
     {
         // estimate translation model at the current cell using RANSAC
 
+        float x1, y1;
         const Cell &cell = grid_[ci];
-        ninliersMax = 0;
-        dxBest = dyBest = 0.f;
+        int ninliers, ninliersMax = 0;
+        float dxBest = 0.f, dyBest = 0.f;
 
         // find the best hypothesis
 
@@ -121,9 +116,9 @@ void TranslationBasedLocalOutlierRejector::process(
         {
             for (int iter = 0; iter < niters; ++iter)
             {
-                idx = cell[static_cast<unsigned>(rng) % cell.size()];
-                dx = points1_[idx].x - points0_[idx].x;
-                dy = points1_[idx].y - points0_[idx].y;
+                int idx = cell[static_cast<unsigned>(rng) % cell.size()];
+                float dx = points1_[idx].x - points0_[idx].x;
+                float dy = points1_[idx].y - points0_[idx].y;
 
                 ninliers = 0;
                 for (size_t i = 0; i < cell.size(); ++i)