diff --git a/modules/hdf/src/hdf5.cpp b/modules/hdf/src/hdf5.cpp
index 7f13398f7..1886574e3 100644
--- a/modules/hdf/src/hdf5.cpp
+++ b/modules/hdf/src/hdf5.cpp
@@ -433,8 +433,8 @@ void HDF5Impl::dscreate( const int rows, const int cols, const int type,
                  String dslabel, const int compresslevel,
                  const vector<int>& dims_chunks ) const
 {
-    CV_Assert( &dims_chunks[0] == NULL || dims_chunks.size() == 2 );
-    dscreate( rows, cols, type, dslabel, compresslevel, &dims_chunks[0] );
+    CV_Assert( dims_chunks.empty() || dims_chunks.size() == 2 );
+    dscreate( rows, cols, type, dslabel, compresslevel, dims_chunks.empty() ? NULL : &(dims_chunks[0]) );
 }
 
 void HDF5Impl::dscreate( const int rows, const int cols, const int type,
@@ -466,10 +466,10 @@ void HDF5Impl::dscreate( const vector<int>& sizes, const int type,
                  String dslabel, const int compresslevel,
                  const vector<int>& dims_chunks ) const
 {
-    CV_Assert( &dims_chunks[0] == NULL || dims_chunks.size() == sizes.size() );
+    CV_Assert( dims_chunks.empty() || dims_chunks.size() == sizes.size() );
 
     const int n_dims = (int) sizes.size();
-    dscreate( n_dims, &sizes[0], type, dslabel, compresslevel, &dims_chunks[0] );
+    dscreate( n_dims, &sizes[0], type, dslabel, compresslevel, dims_chunks.empty() ? NULL : &(dims_chunks[0]) );
 }
 
 void HDF5Impl::dscreate( const int n_dims, const int* sizes, const int type,
diff --git a/modules/xfeatures2d/src/pct_signatures/grayscale_bitmap.cpp b/modules/xfeatures2d/src/pct_signatures/grayscale_bitmap.cpp
index d4062ba6d..0ed6a7632 100644
--- a/modules/xfeatures2d/src/pct_signatures/grayscale_bitmap.cpp
+++ b/modules/xfeatures2d/src/pct_signatures/grayscale_bitmap.cpp
@@ -110,7 +110,7 @@ namespace cv
                     }
                 }
                 // Prepare the preallocated contrast matrix for contrast-entropy computations
-                mCoOccurrenceMatrix.resize(1 << (mBitsPerPixel * 2));   // mCoOccurrenceMatrix size = maxPixelValue^2
+                mCoOccurrenceMatrix.resize((int)(1 << (mBitsPerPixel * 2)));   // mCoOccurrenceMatrix size = maxPixelValue^2
             }