diff --git a/modules/core/include/opencv2/core/operations.hpp b/modules/core/include/opencv2/core/operations.hpp
index fc40f5724..1ee96bb09 100644
--- a/modules/core/include/opencv2/core/operations.hpp
+++ b/modules/core/include/opencv2/core/operations.hpp
@@ -716,12 +716,12 @@ template<typename _Tp, int m> struct CV_EXPORTS Matx_DetOp
     double operator ()(const Matx<_Tp, m, m>& a) const
     {
         Matx<_Tp, m, m> temp = a;
-        double p = LU(temp.val, m, m, 0, 0, 0);
+        double p = LU(temp.val, m*sizeof(_Tp), m, 0, 0, 0);
         if( p == 0 )
             return p;
         for( int i = 0; i < m; i++ )
             p *= temp(i, i);
-        return p;
+        return 1./p;
     }
 };
 
diff --git a/modules/core/include/opencv2/core/types_c.h b/modules/core/include/opencv2/core/types_c.h
index cbc7872e6..33e7fe993 100644
--- a/modules/core/include/opencv2/core/types_c.h
+++ b/modules/core/include/opencv2/core/types_c.h
@@ -342,9 +342,8 @@ CV_INLINE  int  cvFloor( double value )
     return i - (i > value);
 #else
     int i = cvRound(value);
-    Cv32suf diff;
-    diff.f = (float)(value - i);
-    return i - (diff.i < 0);
+    float diff = (float)(value - i);
+    return i - (diff < 0);
 #endif
 }
 
@@ -360,9 +359,8 @@ CV_INLINE  int  cvCeil( double value )
     return i + (i < value);
 #else
     int i = cvRound(value);
-    Cv32suf diff;
-    diff.f = (float)(i - value);
-    return i + (diff.i < 0);
+    float diff = (float)(i - value);
+    return i + (diff < 0);
 #endif
 }
 
@@ -371,31 +369,19 @@ CV_INLINE  int  cvCeil( double value )
 
 CV_INLINE int cvIsNaN( double value )
 {
-#if 1/*defined _MSC_VER || defined __BORLANDC__
-    return _isnan(value);
-#elif defined __GNUC__
-    return isnan(value);
-#else*/
     Cv64suf ieee754;
     ieee754.f = value;
     return ((unsigned)(ieee754.u >> 32) & 0x7fffffff) +
            ((unsigned)ieee754.u != 0) > 0x7ff00000;
-#endif
 }
 
 
 CV_INLINE int cvIsInf( double value )
 {
-#if 1/*defined _MSC_VER || defined __BORLANDC__
-    return !_finite(value);
-#elif defined __GNUC__
-    return isinf(value);
-#else*/
     Cv64suf ieee754;
     ieee754.f = value;
     return ((unsigned)(ieee754.u >> 32) & 0x7fffffff) == 0x7ff00000 &&
            (unsigned)ieee754.u == 0;
-#endif
 }
 
 
diff --git a/modules/core/src/matrix.cpp b/modules/core/src/matrix.cpp
index 7b58debfc..21dfd6141 100644
--- a/modules/core/src/matrix.cpp
+++ b/modules/core/src/matrix.cpp
@@ -830,7 +830,8 @@ int Mat::checkVector(int _elemChannels, int _depth, bool _requireContinuous) con
 {
     return (depth() == _depth || _depth <= 0) &&
         (isContinuous() || !_requireContinuous) &&
-        ((dims == 2 && (((rows == 1 || cols == 1) && channels() == _elemChannels) || (cols == _elemChannels))) ||
+        ((dims == 2 && (((rows == 1 || cols == 1) && channels() == _elemChannels) ||
+                        (cols == _elemChannels && channels() == 1))) ||
         (dims == 3 && channels() == 1 && size.p[2] == _elemChannels && (size.p[0] == 1 || size.p[1] == 1) &&
          (isContinuous() || step.p[1] == step.p[2]*size.p[2])))
     ? (int)(total()*channels()/_elemChannels) : -1;
diff --git a/modules/core/test/test_operations.cpp b/modules/core/test/test_operations.cpp
index ad201ea0c..6b36883cf 100644
--- a/modules/core/test/test_operations.cpp
+++ b/modules/core/test/test_operations.cpp
@@ -998,6 +998,23 @@ bool CV_OperationsTest::operations1()
 
         add(Mat::zeros(6, 1, CV_64F), 1, c, noArray(), c.type());
         CV_Assert( norm(Matx61f(1.f, 1.f, 1.f, 1.f, 1.f, 1.f), c, CV_C) == 0 );
+
+        vector<Point2f> pt2d(3);
+        vector<Point3d> pt3d(2);
+
+        CV_Assert( Mat(pt2d).checkVector(2) == 3 && Mat(pt2d).checkVector(3) < 0 &&
+                   Mat(pt3d).checkVector(2) < 0 && Mat(pt3d).checkVector(3) == 2 );
+
+        Matx44f m44(0.8147f, 0.6324f, 0.9575f, 0.9572f,
+                0.9058f, 0.0975f, 0.9649f, 0.4854f,
+                0.1270f, 0.2785f, 0.1576f, 0.8003f,
+                0.9134f, 0.5469f, 0.9706f, 0.1419f);
+        double d = determinant(m44);
+        CV_Assert( fabs(d - (-0.0262)) <= 0.001 );
+
+        Cv32suf z;
+        z.i = 0x80000000;
+        CV_Assert( cvFloor(z.f) == 0 && cvCeil(z.f) == 0 && cvRound(z.f) == 0 );
     }
     catch(const test_excep&)
     {