diff --git a/modules/calib3d/test/test_reproject_image_to_3d.cpp b/modules/calib3d/test/test_reproject_image_to_3d.cpp
index 3e77a290ce..7364d3bf46 100644
--- a/modules/calib3d/test/test_reproject_image_to_3d.cpp
+++ b/modules/calib3d/test/test_reproject_image_to_3d.cpp
@@ -138,7 +138,12 @@ protected:
             {
                 InT d = disp(y, x);
 
-                double from[4] = { x, y, d, 1 };
+                double from[4] = {
+                    static_cast<double>(x),
+                    static_cast<double>(y),
+                    static_cast<double>(d),
+                    1.0,
+                };
                 Mat_<double> res = Q * Mat_<double>(4, 1, from);
                 res /= res(3, 0);
 
diff --git a/modules/calib3d/test/test_undistort_badarg.cpp b/modules/calib3d/test/test_undistort_badarg.cpp
index f3f762fa65..cfce8a49c6 100644
--- a/modules/calib3d/test/test_undistort_badarg.cpp
+++ b/modules/calib3d/test/test_undistort_badarg.cpp
@@ -104,7 +104,10 @@ void CV_UndistortPointsBadArgTest::run(int)
     img_size.height = 600;
     double cam[9] = {150.f, 0.f, img_size.width/2.f, 0, 300.f, img_size.height/2.f, 0.f, 0.f, 1.f};
     double dist[4] = {0.01,0.02,0.001,0.0005};
-    double s_points[N_POINTS2] = {img_size.width/4,img_size.height/4};
+    double s_points[N_POINTS2] = {
+        static_cast<double>(img_size.width) / 4.0,
+        static_cast<double>(img_size.height) / 4.0,
+    };
     double d_points[N_POINTS2];
     double p[9] = {155.f, 0.f, img_size.width/2.f+img_size.width/50.f, 0, 310.f, img_size.height/2.f+img_size.height/50.f, 0.f, 0.f, 1.f};
     double r[9] = {1,0,0,0,1,0,0,0,1};
diff --git a/modules/core/test/test_io.cpp b/modules/core/test/test_io.cpp
index 37bff62151..0c401f8ebd 100644
--- a/modules/core/test/test_io.cpp
+++ b/modules/core/test/test_io.cpp
@@ -144,7 +144,11 @@ protected:
 
             depth = cvtest::randInt(rng) % (CV_64F+1);
             cn = cvtest::randInt(rng) % 4 + 1;
-            int sz[] = {cvtest::randInt(rng)%10+1, cvtest::randInt(rng)%10+1, cvtest::randInt(rng)%10+1};
+            int sz[] = {
+                static_cast<int>(cvtest::randInt(rng)%10+1),
+                static_cast<int>(cvtest::randInt(rng)%10+1),
+                static_cast<int>(cvtest::randInt(rng)%10+1),
+            };
             MatND test_mat_nd(3, sz, CV_MAKETYPE(depth, cn));
 
             rng0.fill(test_mat_nd, CV_RAND_UNI, Scalar::all(ranges[depth][0]), Scalar::all(ranges[depth][1]));
@@ -156,8 +160,12 @@ protected:
                 multiply(test_mat_nd, test_mat_scale, test_mat_nd);
             }
 
-            int ssz[] = {cvtest::randInt(rng)%10+1, cvtest::randInt(rng)%10+1,
-                cvtest::randInt(rng)%10+1,cvtest::randInt(rng)%10+1};
+            int ssz[] = {
+                static_cast<int>(cvtest::randInt(rng)%10+1),
+                static_cast<int>(cvtest::randInt(rng)%10+1),
+                static_cast<int>(cvtest::randInt(rng)%10+1),
+                static_cast<int>(cvtest::randInt(rng)%10+1),
+            };
             SparseMat test_sparse_mat = cvTsGetRandomSparseMat(4, ssz, cvtest::randInt(rng)%(CV_64F+1),
                                                                cvtest::randInt(rng) % 10000, 0, 100, rng);
 
diff --git a/modules/cudawarping/perf/perf_warping.cpp b/modules/cudawarping/perf/perf_warping.cpp
index 36662418c3..6ce547e60e 100644
--- a/modules/cudawarping/perf/perf_warping.cpp
+++ b/modules/cudawarping/perf/perf_warping.cpp
@@ -253,7 +253,7 @@ PERF_TEST_P(Sz_Depth_Cn_Inter_Border, WarpAffine,
     const double aplha = CV_PI / 4;
     const double mat[2 * 3] =
     {
-        std::cos(aplha), -std::sin(aplha), src.cols / 2,
+        std::cos(aplha), -std::sin(aplha), static_cast<double>(src.cols) / 2.0,
         std::sin(aplha),  std::cos(aplha), 0
     };
     const cv::Mat M(2, 3, CV_64F, (void*) mat);
@@ -301,7 +301,7 @@ PERF_TEST_P(Sz_Depth_Cn_Inter_Border, WarpPerspective,
     declare.in(src, WARMUP_RNG);
 
     const double aplha = CV_PI / 4;
-    double mat[3][3] = { {std::cos(aplha), -std::sin(aplha), src.cols / 2},
+    double mat[3][3] = { {std::cos(aplha), -std::sin(aplha), static_cast<double>(src.cols) / 2.0},
                          {std::sin(aplha),  std::cos(aplha), 0},
                          {0.0,              0.0,             1.0}};
     const cv::Mat M(3, 3, CV_64F, (void*) mat);
diff --git a/modules/imgproc/src/smooth.cpp b/modules/imgproc/src/smooth.cpp
index 90840cdaa5..dbe8a6315a 100644
--- a/modules/imgproc/src/smooth.cpp
+++ b/modules/imgproc/src/smooth.cpp
@@ -2770,7 +2770,7 @@ public:
         #if CV_SSE3
         int CV_DECL_ALIGNED(16) buf[4];
         float CV_DECL_ALIGNED(16) bufSum[4];
-        static const int CV_DECL_ALIGNED(16) bufSignMask[] = { 0x80000000, 0x80000000, 0x80000000, 0x80000000 };
+        static const unsigned int CV_DECL_ALIGNED(16) bufSignMask[] = { 0x80000000, 0x80000000, 0x80000000, 0x80000000 };
         bool haveSSE3 = checkHardwareSupport(CV_CPU_SSE3);
         #endif
 
@@ -3152,7 +3152,7 @@ public:
         #if CV_SSE3
         int CV_DECL_ALIGNED(16) idxBuf[4];
         float CV_DECL_ALIGNED(16) bufSum32[4];
-        static const int CV_DECL_ALIGNED(16) bufSignMask[] = { 0x80000000, 0x80000000, 0x80000000, 0x80000000 };
+        static const unsigned int CV_DECL_ALIGNED(16) bufSignMask[] = { 0x80000000, 0x80000000, 0x80000000, 0x80000000 };
         bool haveSSE3 = checkHardwareSupport(CV_CPU_SSE3);
         #endif
 
diff --git a/modules/python/src2/cv2.cpp b/modules/python/src2/cv2.cpp
index 3611253202..974545994b 100644
--- a/modules/python/src2/cv2.cpp
+++ b/modules/python/src2/cv2.cpp
@@ -226,7 +226,7 @@ static bool pyopencv_to(PyObject* o, Mat& m, const ArgInfo info)
 
     if( PyInt_Check(o) )
     {
-        double v[] = {(double)PyInt_AsLong((PyObject*)o), 0., 0., 0.};
+        double v[] = {static_cast<double>(PyInt_AsLong((PyObject*)o)), 0., 0., 0.};
         m = Mat(4, 1, CV_64F, v).clone();
         return true;
     }