Improve the documentation.

CMakeLists.txt

@@ -10,7 +10,7 @@
 if(" ${CMAKE_SOURCE_DIR}" STREQUAL " ${CMAKE_BINARY_DIR}")
   message(FATAL_ERROR "
 FATAL: In-source builds are not allowed.
-       You should create separate directory for build files.
+       You should create a separate directory for build files.
 ")
 endif()
 
@@ -263,7 +263,7 @@ OCV_OPTION(BUILD_PACKAGE            "Enables 'make package_source' command"
 OCV_OPTION(BUILD_PERF_TESTS         "Build performance tests"                     ON  IF (NOT APPLE_FRAMEWORK) )
 OCV_OPTION(BUILD_TESTS              "Build accuracy & regression tests"           ON  IF (NOT APPLE_FRAMEWORK) )
 OCV_OPTION(BUILD_WITH_DEBUG_INFO    "Include debug info into debug libs (not MSCV only)" ON )
-OCV_OPTION(BUILD_WITH_STATIC_CRT    "Enables use of staticaly linked CRT for staticaly linked OpenCV" ON IF MSVC )
+OCV_OPTION(BUILD_WITH_STATIC_CRT    "Enables use of statically linked CRT for statically linked OpenCV" ON IF MSVC )
 OCV_OPTION(BUILD_WITH_DYNAMIC_IPP   "Enables dynamic linking of IPP (only for standalone IPP)" OFF )
 OCV_OPTION(BUILD_FAT_JAVA_LIB       "Create fat java wrapper containing the whole OpenCV library" ON IF NOT BUILD_SHARED_LIBS AND CMAKE_COMPILER_IS_GNUCXX )
 OCV_OPTION(BUILD_ANDROID_SERVICE    "Build OpenCV Manager for Google Play" OFF IF ANDROID )

cmake/OpenCVUtils.cmake

@@ -48,8 +48,8 @@ macro(ocv_update VAR)
   endif()
 endmacro()
 
-# Search packages for host system instead of packages for target system
+# Search packages for the host system instead of packages for the target system
-# in case of cross compilation thess macro should be defined by toolchain file
+# in case of cross compilation these macros should be defined by the toolchain file
 if(NOT COMMAND find_host_package)
   macro(find_host_package)
     find_package(${ARGN})
@@ -128,7 +128,7 @@ function(ocv_is_opencv_directory result_var dir)
 endfunction()
 
 
-# adds include directories in such way that directories from the OpenCV source tree go first
+# adds include directories in such a way that directories from the OpenCV source tree go first
 function(ocv_include_directories)
   ocv_debug_message("ocv_include_directories( ${ARGN} )")
   set(__add_before "")
@@ -162,7 +162,7 @@ function(ocv_append_dependant_targets target)
   set(OPENCV_DEPENDANT_TARGETS_${target} "${OPENCV_DEPENDANT_TARGETS_${target}};${ARGN}" CACHE INTERNAL "" FORCE)
 endfunction()
 
-# adds include directories in such way that directories from the OpenCV source tree go first
+# adds include directories in such a way that directories from the OpenCV source tree go first
 function(ocv_target_include_directories target)
   #ocv_debug_message("ocv_target_include_directories(${target} ${ARGN})")
   _ocv_fix_target(target)
@@ -497,7 +497,7 @@ macro(ocv_check_modules define)
 endmacro()
 
 
-# Macros that checks if module have been installed.
+# Macro that checks if module has been installed.
 # After it adds module to build and define
 # constants passed as second arg
 macro(CHECK_MODULE module_name define cv_module)
@@ -656,7 +656,7 @@ macro(ocv_list_add_suffix LST SUFFIX)
 endmacro()
 
 
-# gets and removes the first element from list
+# gets and removes the first element from the list
 macro(ocv_list_pop_front LST VAR)
   if(${LST})
     list(GET ${LST} 0 ${VAR})

cmake/OpenCVVersion.cmake

@@ -13,8 +13,8 @@ set(OPENCV_VERSION "${OPENCV_VERSION_PLAIN}${OPENCV_VERSION_STATUS}")
 set(OPENCV_SOVERSION "${OPENCV_VERSION_MAJOR}.${OPENCV_VERSION_MINOR}")
 set(OPENCV_LIBVERSION "${OPENCV_VERSION_MAJOR}.${OPENCV_VERSION_MINOR}.${OPENCV_VERSION_PATCH}")
 
-# create a dependency on version file
+# create a dependency on the version file
-# we never use output of the following command but cmake will rerun automatically if the version file changes
+# we never use the output of the following command but cmake will rerun automatically if the version file changes
 configure_file("${OPENCV_VERSION_FILE}" "${CMAKE_BINARY_DIR}/junk/version.junk" COPYONLY)
 
 ocv_update(OPENCV_VS_VER_FILEVERSION_QUAD "${OPENCV_VERSION_MAJOR},${OPENCV_VERSION_MINOR},${OPENCV_VERSION_PATCH},0")

modules/core/include/opencv2/core/utility.hpp

@@ -198,12 +198,12 @@ If threads == 0, OpenCV will disable threading optimizations and run all it's fu
 sequentially. Passing threads \< 0 will reset threads number to system default. This function must
 be called outside of parallel region.
 
-OpenCV will try to run it's functions with specified threads number, but some behaviour differs from
+OpenCV will try to run its functions with specified threads number, but some behaviour differs from
 framework:
 -   `TBB` - User-defined parallel constructions will run with the same threads number, if
-    another does not specified. If later on user creates own scheduler, OpenCV will use it.
+    another is not specified. If later on user creates his own scheduler, OpenCV will use it.
 -   `OpenMP` - No special defined behaviour.
--   `Concurrency` - If threads == 1, OpenCV will disable threading optimizations and run it's
+-   `Concurrency` - If threads == 1, OpenCV will disable threading optimizations and run its
     functions sequentially.
 -   `GCD` - Supports only values \<= 0.
 -   `C=` - No special defined behaviour.
@@ -233,7 +233,7 @@ CV_EXPORTS_W int getNumThreads();
 /** @brief Returns the index of the currently executed thread within the current parallel region. Always
 returns 0 if called outside of parallel region.
 
-The exact meaning of return value depends on the threading framework used by OpenCV library:
+The exact meaning of the return value depends on the threading framework used by OpenCV library:
 - `TBB` - Unsupported with current 4.1 TBB release. Maybe will be supported in future.
 - `OpenMP` - The thread number, within the current team, of the calling thread.
 - `Concurrency` - An ID for the virtual processor that the current context is executing on (0
@@ -285,6 +285,19 @@ tm.start();
 tm.stop();
 std::cout << tm.getTimeSec();
 @endcode
+
+It is also possible to compute the average time over multiple runs:
+@code
+TickMeter tm;
+for (int i = 0; i < 100; i++)
+{
+    tm.start();
+    // do something ...
+    tm.stop();
+}
+double average_time = tm.getTimeSec() / tm.getCounter();
+std::cout << "Average time in second per iteration is: " << average_time << std::endl;
+@endcode
 @sa getTickCount, getTickFrequency
 */
 
@@ -428,12 +441,13 @@ The function returns the aligned pointer of the same type as the input pointer:
  */
 template<typename _Tp> static inline _Tp* alignPtr(_Tp* ptr, int n=(int)sizeof(_Tp))
 {
+    CV_DbgAssert((n & (n - 1)) == 0); // n is a power of 2
     return (_Tp*)(((size_t)ptr + n-1) & -n);
 }
 
 /** @brief Aligns a buffer size to the specified number of bytes.
 
-The function returns the minimum number that is greater or equal to sz and is divisible by n :
+The function returns the minimum number that is greater than or equal to sz and is divisible by n :
 \f[\texttt{(sz + n-1) & -n}\f]
 @param sz Buffer size to align.
 @param n Alignment size that must be a power of two.
@@ -482,7 +496,7 @@ The function returns true if the optimized code is enabled. Otherwise, it return
  */
 CV_EXPORTS_W bool useOptimized();
 
-static inline size_t getElemSize(int type) { return CV_ELEM_SIZE(type); }
+static inline size_t getElemSize(int type) { return (size_t)CV_ELEM_SIZE(type); }
 
 /////////////////////////////// Parallel Primitives //////////////////////////////////
 
@@ -526,10 +540,10 @@ template<typename _Tp, typename Functor> inline
 void Mat::forEach_impl(const Functor& operation) {
     if (false) {
         operation(*reinterpret_cast<_Tp*>(0), reinterpret_cast<int*>(0));
-        // If your compiler fail in this line.
+        // If your compiler fails in this line.
         // Please check that your functor signature is
-        //     (_Tp&, const int*)   <- multidimential
+        //     (_Tp&, const int*)   <- multi-dimensional
-        //  or (_Tp&, void*)        <- in case of you don't need current idx.
+        //  or (_Tp&, void*)        <- in case you don't need current idx.
     }
 
     CV_Assert(this->total() / this->size[this->dims - 1] <= INT_MAX);