Merge remote-tracking branch 'upstream/3.4' into merge-3.4

CMakeLists.txt

@@ -341,9 +341,12 @@ OCV_OPTION(WITH_V4L "Include Video 4 Linux support" ON
 OCV_OPTION(WITH_DSHOW "Build VideoIO with DirectShow support" ON
   VISIBLE_IF WIN32 AND NOT ARM AND NOT WINRT
   VERIFY HAVE_DSHOW)
-OCV_OPTION(WITH_MSMF "Build VideoIO with Media Foundation support" ON
+OCV_OPTION(WITH_MSMF "Build VideoIO with Media Foundation support" NOT MINGW
   VISIBLE_IF WIN32
   VERIFY HAVE_MSMF)
+OCV_OPTION(WITH_MSMF_DXVA "Enable hardware acceleration in Media Foundation backend" WITH_MSMF
+  VISIBLE_IF WIN32
+  VERIFY HAVE_MSMF_DXVA)
 OCV_OPTION(WITH_XIMEA "Include XIMEA cameras support" OFF
   VISIBLE_IF NOT ANDROID AND NOT WINRT
   VERIFY HAVE_XIMEA)
@@ -590,7 +593,7 @@ else()
     ocv_update(OPENCV_OTHER_INSTALL_PATH         "${CMAKE_INSTALL_DATAROOTDIR}/opencv4")
     ocv_update(OPENCV_LICENSES_INSTALL_PATH      "${CMAKE_INSTALL_DATAROOTDIR}/licenses/opencv4")
   endif()
-  ocv_update(OPENCV_PYTHON_INSTALL_PATH  "python")
+  #ocv_update(OPENCV_PYTHON_INSTALL_PATH  "python")  # no default value, see https://github.com/opencv/opencv/issues/13202
 endif()
 
 ocv_update(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${OPENCV_LIB_INSTALL_PATH}")
@@ -1447,6 +1450,7 @@ endif()
 
 if(WITH_MSMF OR HAVE_MSMF)
   status("    Media Foundation:" HAVE_MSMF    THEN YES                                        ELSE NO)
+  status("      DXVA:"           HAVE_MSMF_DXVA    THEN YES    ELSE NO)
 endif()
 
 if(WITH_XIMEA OR HAVE_XIMEA)

cmake/OpenCVDetectCUDA.cmake

@@ -52,7 +52,7 @@ if(CUDA_FOUND)
 
   message(STATUS "CUDA detected: " ${CUDA_VERSION})
 
-  set(_generations "Fermi" "Kepler" "Maxwell" "Pascal" "Volta")
+  set(_generations "Fermi" "Kepler" "Maxwell" "Pascal" "Volta" "Turing")
   if(NOT CMAKE_CROSSCOMPILING)
     list(APPEND _generations "Auto")
   endif()

cmake/OpenCVFindLibsVideo.cmake

@@ -246,14 +246,15 @@ endif(WITH_DSHOW)
 ocv_clear_vars(HAVE_MSMF)
 if(WITH_MSMF)
   check_include_file(Mfapi.h HAVE_MSMF)
-  check_include_file(D3D11.h D3D11_found)
-  check_include_file(D3d11_4.h D3D11_4_found)
-  if(D3D11_found AND D3D11_4_found)
-    set(HAVE_DXVA YES)
-  else()
-    set(HAVE_DXVA NO)
+  set(HAVE_MSMF_DXVA "")
+  if(WITH_MSMF_DXVA)
+    check_include_file(D3D11.h D3D11_found)
+    check_include_file(D3d11_4.h D3D11_4_found)
+    if(D3D11_found AND D3D11_4_found)
+      set(HAVE_MSMF_DXVA YES)
+    endif()
   endif()
-endif(WITH_MSMF)
+endif()
 
 # --- Extra HighGUI and VideoIO libs on Windows ---
 if(WIN32)

cmake/OpenCVGenSetupVars.cmake

@@ -43,11 +43,24 @@ else()
 endif()
 file(RELATIVE_PATH OPENCV_PYTHON_DIR_RELATIVE_CMAKECONFIG
     "${CMAKE_INSTALL_PREFIX}/${OPENCV_SETUPVARS_INSTALL_PATH}/" "${CMAKE_INSTALL_PREFIX}/")
-if(IS_ABSOLUTE "${OPENCV_PYTHON_INSTALL_PATH}")
-  set(OPENCV_PYTHON_DIR_RELATIVE_CMAKECONFIG "${OPENCV_PYTHON_INSTALL_PATH}")
-  message(WARNING "CONFIGURATION IS NOT SUPPORTED: validate setupvars script in install directory")
+if(DEFINED OPENCV_PYTHON_INSTALL_PATH)
+  set(__python_path "${OPENCV_PYTHON_INSTALL_PATH}")
+elseif(DEFINED OPENCV_PYTHON_INSTALL_PATH_SETUPVARS)
+  set(__python_path "${OPENCV_PYTHON_INSTALL_PATH_SETUPVARS}")
+endif()
+if(DEFINED __python_path)
+  if(IS_ABSOLUTE "${__python_path}")
+    set(OPENCV_PYTHON_DIR_RELATIVE_CMAKECONFIG "${__python_path}")
+    message(WARNING "CONFIGURATION IS NOT SUPPORTED: validate setupvars script in install directory")
+  else()
+    ocv_path_join(OPENCV_PYTHON_DIR_RELATIVE_CMAKECONFIG "${OPENCV_PYTHON_DIR_RELATIVE_CMAKECONFIG}" "${__python_path}")
+  endif()
 else()
-  ocv_path_join(OPENCV_PYTHON_DIR_RELATIVE_CMAKECONFIG "${OPENCV_PYTHON_DIR_RELATIVE_CMAKECONFIG}" "${OPENCV_PYTHON_INSTALL_PATH}")
+  if(DEFINED OPENCV_PYTHON3_INSTALL_PATH)
+    ocv_path_join(OPENCV_PYTHON_DIR_RELATIVE_CMAKECONFIG "${OPENCV_PYTHON_DIR_RELATIVE_CMAKECONFIG}" "${OPENCV_PYTHON3_INSTALL_PATH}")
+  else()
+    set(OPENCV_PYTHON_DIR_RELATIVE_CMAKECONFIG "python_loader_is_not_installed")
+  endif()
 endif()
 configure_file("${OpenCV_SOURCE_DIR}/cmake/templates/${OPENCV_SETUPVARS_TEMPLATE}" "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/install/${OPENCV_SETUPVARS_FILENAME}" @ONLY)
 install(FILES "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/install/${OPENCV_SETUPVARS_FILENAME}"

doc/tutorials/imgproc/histograms/template_matching/template_matching.markdown

@@ -65,7 +65,7 @@ that should be used to find the match.
     -#  **Mask image (M):** The mask, a grayscale image that masks the template
 
 
--   Only two matching methods currently accept a mask: CV_TM_SQDIFF and CV_TM_CCORR_NORMED (see
+-   Only two matching methods currently accept a mask: TM_SQDIFF and TM_CCORR_NORMED (see
     below for explanation of all the matching methods available in opencv).
 
 
@@ -86,31 +86,31 @@ that should be used to find the match.
 Good question. OpenCV implements Template matching in the function **matchTemplate()**. The
 available methods are 6:
 
--#  **method=CV_TM_SQDIFF**
+-#  **method=TM_SQDIFF**
 
     \f[R(x,y)= \sum _{x',y'} (T(x',y')-I(x+x',y+y'))^2\f]
 
--#  **method=CV_TM_SQDIFF_NORMED**
+-#  **method=TM_SQDIFF_NORMED**
 
     \f[R(x,y)= \frac{\sum_{x',y'} (T(x',y')-I(x+x',y+y'))^2}{\sqrt{\sum_{x',y'}T(x',y')^2 \cdot \sum_{x',y'} I(x+x',y+y')^2}}\f]
 
--#  **method=CV_TM_CCORR**
+-#  **method=TM_CCORR**
 
     \f[R(x,y)= \sum _{x',y'} (T(x',y')  \cdot I(x+x',y+y'))\f]
 
--#  **method=CV_TM_CCORR_NORMED**
+-#  **method=TM_CCORR_NORMED**
 
     \f[R(x,y)= \frac{\sum_{x',y'} (T(x',y') \cdot I(x+x',y+y'))}{\sqrt{\sum_{x',y'}T(x',y')^2 \cdot \sum_{x',y'} I(x+x',y+y')^2}}\f]
 
--#  **method=CV_TM_CCOEFF**
+-#  **method=TM_CCOEFF**
 
     \f[R(x,y)= \sum _{x',y'} (T'(x',y')  \cdot I'(x+x',y+y'))\f]
 
     where
 
     \f[\begin{array}{l} T'(x',y')=T(x',y') - 1/(w  \cdot h)  \cdot \sum _{x'',y''} T(x'',y'') \\ I'(x+x',y+y')=I(x+x',y+y') - 1/(w  \cdot h)  \cdot \sum _{x'',y''} I(x+x'',y+y'') \end{array}\f]
 
--#  **method=CV_TM_CCOEFF_NORMED**
+-#  **method=TM_CCOEFF_NORMED**
 
     \f[R(x,y)= \frac{ \sum_{x',y'} (T'(x',y') \cdot I'(x+x',y+y')) }{ \sqrt{\sum_{x',y'}T'(x',y')^2 \cdot \sum_{x',y'} I'(x+x',y+y')^2} }\f]
 

modules/core/include/opencv2/core/eigen.hpp

@@ -60,7 +60,7 @@ namespace cv
 //! @{
 
 template<typename _Tp, int _rows, int _cols, int _options, int _maxRows, int _maxCols> static inline
-void eigen2cv( const Eigen::Matrix<_Tp, _rows, _cols, _options, _maxRows, _maxCols>& src, Mat& dst )
+void eigen2cv( const Eigen::Matrix<_Tp, _rows, _cols, _options, _maxRows, _maxCols>& src, OutputArray dst )
 {
     if( !(src.Flags & Eigen::RowMajorBit) )
     {

modules/core/include/opencv2/core/hal/intrin_vsx.hpp

@@ -718,7 +718,7 @@ OPENCV_HAL_IMPL_VSX_REDUCE_OP_4(v_float32x4, vec_float4, float, min, vec_min)
 
 inline double v_reduce_sum(const v_float64x2& a)
 {
-    return vec_extract(vec_add(a.val, vec_sld(a.val, a.val, 8)), 0);
+    return vec_extract(vec_add(a.val, vec_permi(a.val, a.val, 3)), 0);
 }
 
 #define OPENCV_HAL_IMPL_VSX_REDUCE_OP_8(_Tpvec, _Tpvec2, scalartype, suffix, func) \

modules/core/src/ocl.cpp

@@ -1257,6 +1257,14 @@ struct Device::Impl
         else
             vendorID_ = UNKNOWN_VENDOR;
 
+        const size_t CV_OPENCL_DEVICE_MAX_WORK_GROUP_SIZE = utils::getConfigurationParameterSizeT("OPENCV_OPENCL_DEVICE_MAX_WORK_GROUP_SIZE", 0);
+        if (CV_OPENCL_DEVICE_MAX_WORK_GROUP_SIZE > 0)
+        {
+            const size_t new_maxWorkGroupSize = std::min(maxWorkGroupSize_, CV_OPENCL_DEVICE_MAX_WORK_GROUP_SIZE);
+            if (new_maxWorkGroupSize != maxWorkGroupSize_)
+                CV_LOG_WARNING(NULL, "OpenCL: using workgroup size: " << new_maxWorkGroupSize << " (was " << maxWorkGroupSize_ << ")");
+            maxWorkGroupSize_ = new_maxWorkGroupSize;
+        }
 #if 0
         if (isExtensionSupported("cl_khr_spir"))
         {

modules/core/test/test_mat.cpp

@@ -3,6 +3,12 @@
 // of this distribution and at http://opencv.org/license.html.
 #include "test_precomp.hpp"
 
+#ifdef HAVE_EIGEN
+#include <Eigen/Core>
+#include <Eigen/Dense>
+#include "opencv2/core/eigen.hpp"
+#endif
+
 namespace opencv_test { namespace {
 
 class Core_ReduceTest : public cvtest::BaseTest
@@ -1962,4 +1968,22 @@ TEST(Core_Vectors, issue_13078_workaround)
     ASSERT_EQ(7, ints[3]);
 }
 
+
+#ifdef HAVE_EIGEN
+TEST(Core_Eigen, eigen2cv_check_Mat_type)
+{
+    Mat A(4, 4, CV_32FC1, Scalar::all(0));
+    Eigen::MatrixXf eigen_A;
+    cv2eigen(A, eigen_A);
+
+    Mat_<float> f_mat;
+    EXPECT_NO_THROW(eigen2cv(eigen_A, f_mat));
+    EXPECT_EQ(CV_32FC1, f_mat.type());
+
+    Mat_<double> d_mat;
+    EXPECT_ANY_THROW(eigen2cv(eigen_A, d_mat));
+    //EXPECT_EQ(CV_64FC1, d_mat.type());
+}
+#endif // HAVE_EIGEN
+
 }} // namespace

modules/imgproc/src/deriv.cpp

@@ -441,7 +441,7 @@ void cv::Sobel( InputArray _src, OutputArray _dst, int ddepth, int dx, int dy,
                ocl_sepFilter3x3_8UC1(_src, _dst, ddepth, kx, ky, delta, borderType));
 
     CV_OCL_RUN(ocl::isOpenCLActivated() && _dst.isUMat() && _src.dims() <= 2 && (size_t)_src.rows() > kx.total() && (size_t)_src.cols() > kx.total(),
-               ocl_sepFilter2D(_src, _dst, ddepth, kx, ky, Point(-1, -1), 0, borderType))
+               ocl_sepFilter2D(_src, _dst, ddepth, kx, ky, Point(-1, -1), delta, borderType))
 
     Mat src = _src.getMat();
     Mat dst = _dst.getMat();
@@ -494,7 +494,7 @@ void cv::Scharr( InputArray _src, OutputArray _dst, int ddepth, int dx, int dy,
 
     CV_OCL_RUN(ocl::isOpenCLActivated() && _dst.isUMat() && _src.dims() <= 2 &&
                (size_t)_src.rows() > kx.total() && (size_t)_src.cols() > kx.total(),
-               ocl_sepFilter2D(_src, _dst, ddepth, kx, ky, Point(-1, -1), 0, borderType))
+               ocl_sepFilter2D(_src, _dst, ddepth, kx, ky, Point(-1, -1), delta, borderType))
 
     Mat src = _src.getMat();
     Mat dst = _dst.getMat();

modules/python/CMakeLists.txt

@@ -20,6 +20,7 @@ add_subdirectory(bindings)
 
 if(NOT OPENCV_SKIP_PYTHON_LOADER)
   include("./python_loader.cmake")
+  message(STATUS "OpenCV Python: during development append to PYTHONPATH: ${CMAKE_BINARY_DIR}/python_loader")
 endif()
 
 if(__disable_python2)

modules/python/common.cmake

@@ -120,6 +120,21 @@ if(NOT OPENCV_SKIP_PYTHON_LOADER)
   set(__python_loader_subdir "cv2/")
 endif()
 
+if(NOT " ${PYTHON}" STREQUAL " PYTHON"
+    AND NOT DEFINED OPENCV_PYTHON_INSTALL_PATH
+)
+  if(DEFINED OPENCV_${PYTHON}_INSTALL_PATH)
+    set(OPENCV_PYTHON_INSTALL_PATH "${OPENCV_${PYTHON}_INSTALL_PATH}")
+  elseif(NOT OPENCV_SKIP_PYTHON_LOADER)
+    set(OPENCV_PYTHON_INSTALL_PATH "${${PYTHON}_PACKAGES_PATH}")
+  endif()
+endif()
+
+if(NOT OPENCV_SKIP_PYTHON_LOADER AND DEFINED OPENCV_PYTHON_INSTALL_PATH)
+  include("${CMAKE_CURRENT_LIST_DIR}/python_loader.cmake")
+  set(OPENCV_PYTHON_INSTALL_PATH_SETUPVARS "${OPENCV_PYTHON_INSTALL_PATH}" CACHE INTERNAL "")
+endif()
+
 if(NOT " ${PYTHON}" STREQUAL " PYTHON" AND DEFINED OPENCV_${PYTHON}_INSTALL_PATH)
   set(__python_binary_install_path "${OPENCV_${PYTHON}_INSTALL_PATH}")
 elseif(OPENCV_SKIP_PYTHON_LOADER AND DEFINED ${PYTHON}_PACKAGES_PATH)

modules/python/python_loader.cmake

@@ -2,20 +2,24 @@ ocv_assert(NOT OPENCV_SKIP_PYTHON_LOADER)
 
 set(PYTHON_SOURCE_DIR "${CMAKE_CURRENT_LIST_DIR}")
 
-ocv_assert(DEFINED OPENCV_PYTHON_INSTALL_PATH)
 if(OpenCV_FOUND)
   set(__loader_path "${OpenCV_BINARY_DIR}/python_loader")
+  message(STATUS "OpenCV Python: during development append to PYTHONPATH: ${__loader_path}")
 else()
   set(__loader_path "${CMAKE_BINARY_DIR}/python_loader")
 endif()
 
 set(__python_loader_install_tmp_path "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/install/python_loader/")
-if(IS_ABSOLUTE "${OPENCV_PYTHON_INSTALL_PATH}")
-  set(OpenCV_PYTHON_INSTALL_PATH_RELATIVE_CONFIGCMAKE "${CMAKE_INSTALL_PREFIX}/")
-  set(CMAKE_PYTHON_EXTENSION_INSTALL_PATH_BASE "'${CMAKE_INSTALL_PREFIX}'")
+if(DEFINED OPENCV_PYTHON_INSTALL_PATH)
+  if(IS_ABSOLUTE "${OPENCV_PYTHON_INSTALL_PATH}")
+    set(OpenCV_PYTHON_INSTALL_PATH_RELATIVE_CONFIGCMAKE "${CMAKE_INSTALL_PREFIX}/")
+    set(CMAKE_PYTHON_EXTENSION_INSTALL_PATH_BASE "'${CMAKE_INSTALL_PREFIX}'")
+  else()
+    file(RELATIVE_PATH OpenCV_PYTHON_INSTALL_PATH_RELATIVE_CONFIGCMAKE "${CMAKE_INSTALL_PREFIX}/${OPENCV_PYTHON_INSTALL_PATH}/cv2" ${CMAKE_INSTALL_PREFIX})
+    set(CMAKE_PYTHON_EXTENSION_INSTALL_PATH_BASE "os.path.join(LOADER_DIR, '${OpenCV_PYTHON_INSTALL_PATH_RELATIVE_CONFIGCMAKE}')")
+  endif()
 else()
-  file(RELATIVE_PATH OpenCV_PYTHON_INSTALL_PATH_RELATIVE_CONFIGCMAKE "${CMAKE_INSTALL_PREFIX}/${OPENCV_PYTHON_INSTALL_PATH}/cv2" ${CMAKE_INSTALL_PREFIX})
-  set(CMAKE_PYTHON_EXTENSION_INSTALL_PATH_BASE "os.path.join(LOADER_DIR, '${OpenCV_PYTHON_INSTALL_PATH_RELATIVE_CONFIGCMAKE}')")
+  set(CMAKE_PYTHON_EXTENSION_INSTALL_PATH_BASE "os.path.join(LOADER_DIR, 'not_installed')")
 endif()
 
 set(PYTHON_LOADER_FILES
@@ -25,7 +29,13 @@ set(PYTHON_LOADER_FILES
 foreach(fname ${PYTHON_LOADER_FILES})
   get_filename_component(__dir "${fname}" DIRECTORY)
   file(COPY "${PYTHON_SOURCE_DIR}/package/${fname}" DESTINATION "${__loader_path}/${__dir}")
-  install(FILES "${PYTHON_SOURCE_DIR}/package/${fname}" DESTINATION "${OPENCV_PYTHON_INSTALL_PATH}/${__dir}" COMPONENT python)
+  if(fname STREQUAL "setup.py")
+    if(OPENCV_PYTHON_SETUP_PY_INSTALL_PATH)
+      install(FILES "${PYTHON_SOURCE_DIR}/package/${fname}" DESTINATION "${OPENCV_PYTHON_SETUP_PY_INSTALL_PATH}" COMPONENT python)
+    endif()
+  elseif(DEFINED OPENCV_PYTHON_INSTALL_PATH)
+    install(FILES "${PYTHON_SOURCE_DIR}/package/${fname}" DESTINATION "${OPENCV_PYTHON_INSTALL_PATH}/${__dir}" COMPONENT python)
+  endif()
 endforeach()
 
 if(NOT OpenCV_FOUND)  # Ignore "standalone" builds of Python bindings
@@ -41,14 +51,15 @@ if(NOT OpenCV_FOUND)  # Ignore "standalone" builds of Python bindings
   string(REPLACE ";" ",\n    " CMAKE_PYTHON_BINARIES_PATH "${CMAKE_PYTHON_BINARIES_PATH}")
   configure_file("${PYTHON_SOURCE_DIR}/package/template/config.py.in" "${__loader_path}/cv2/config.py" @ONLY)
 
-  if(WIN32)
-    list(APPEND CMAKE_PYTHON_BINARIES_INSTALL_PATH "os.path.join(${CMAKE_PYTHON_EXTENSION_INSTALL_PATH_BASE}, '${OPENCV_BIN_INSTALL_PATH}')")
-  else()
-    list(APPEND CMAKE_PYTHON_BINARIES_INSTALL_PATH "os.path.join(${CMAKE_PYTHON_EXTENSION_INSTALL_PATH_BASE}, '${OPENCV_LIB_INSTALL_PATH}')")
+  # install
+  if(DEFINED OPENCV_PYTHON_INSTALL_PATH)
+    if(WIN32)
+      list(APPEND CMAKE_PYTHON_BINARIES_INSTALL_PATH "os.path.join(${CMAKE_PYTHON_EXTENSION_INSTALL_PATH_BASE}, '${OPENCV_BIN_INSTALL_PATH}')")
+    else()
+      list(APPEND CMAKE_PYTHON_BINARIES_INSTALL_PATH "os.path.join(${CMAKE_PYTHON_EXTENSION_INSTALL_PATH_BASE}, '${OPENCV_LIB_INSTALL_PATH}')")
+    endif()
+    string(REPLACE ";" ",\n    " CMAKE_PYTHON_BINARIES_PATH "${CMAKE_PYTHON_BINARIES_INSTALL_PATH}")
+    configure_file("${PYTHON_SOURCE_DIR}/package/template/config.py.in" "${__python_loader_install_tmp_path}/cv2/config.py" @ONLY)
+    install(FILES "${__python_loader_install_tmp_path}/cv2/config.py" DESTINATION "${OPENCV_PYTHON_INSTALL_PATH}/cv2/" COMPONENT python)
   endif()
-  string(REPLACE ";" ",\n    " CMAKE_PYTHON_BINARIES_PATH "${CMAKE_PYTHON_BINARIES_INSTALL_PATH}")
-  configure_file("${PYTHON_SOURCE_DIR}/package/template/config.py.in" "${__python_loader_install_tmp_path}/cv2/config.py" @ONLY)
-  install(FILES "${__python_loader_install_tmp_path}/cv2/config.py" DESTINATION "${OPENCV_PYTHON_INSTALL_PATH}/cv2/" COMPONENT python)
-
-  message(STATUS "OpenCV Python: during development append to PYTHONPATH: ${__loader_path}")
 endif()

modules/python/standalone.cmake

@@ -3,7 +3,13 @@ if(NOT DEFINED OpenCV_BINARY_DIR)
 endif()
 include("${OpenCV_BINARY_DIR}/opencv_python_config.cmake")
 if(NOT DEFINED OpenCV_SOURCE_DIR)
-  message(FATAL_ERROR "Missing define of OpenCV_SOURCE_DIR")
+  message(FATAL_ERROR "Missing OpenCV_SOURCE_DIR")
+endif()
+if(NOT OPENCV_PYTHON_INSTALL_PATH)
+  if(NOT DEFINED OPENCV_PYTHON_STANDALONE_INSTALL_PATH)
+    message(FATAL_ERROR "Missing OPENCV_PYTHON_STANDALONE_INSTALL_PATH / OPENCV_PYTHON_INSTALL_PATH")
+  endif()
+  set(OPENCV_PYTHON_INSTALL_PATH "${OPENCV_PYTHON_STANDALONE_INSTALL_PATH}")
 endif()
 
 include("${OpenCV_SOURCE_DIR}/cmake/OpenCVUtils.cmake")

modules/stitching/perf/perf_stich.cpp

@@ -13,13 +13,15 @@ using namespace perf;
 #define WORK_MEGAPIX 0.6
 
 typedef TestBaseWithParam<string> stitch;
+typedef TestBaseWithParam<int> stitchExposureCompensation;
 typedef TestBaseWithParam<tuple<string, string> > stitchDatasets;
 
 #ifdef HAVE_OPENCV_XFEATURES2D
 #define TEST_DETECTORS testing::Values("surf", "orb", "akaze")
 #else
 #define TEST_DETECTORS testing::Values("orb", "akaze")
 #endif
+#define TEST_EXP_COMP_BS testing::Values(32, 16, 12, 10, 8)
 #define AFFINE_DATASETS testing::Values("s", "budapest", "newspaper", "prague")
 
 PERF_TEST_P(stitch, a123, TEST_DETECTORS)
@@ -58,6 +60,38 @@ PERF_TEST_P(stitch, a123, TEST_DETECTORS)
     SANITY_CHECK_NOTHING();
 }
 
+PERF_TEST_P(stitchExposureCompensation, a123, TEST_EXP_COMP_BS)
+{
+    Mat pano;
+
+    vector<Mat> imgs;
+    imgs.push_back( imread( getDataPath("stitching/a1.png") ) );
+    imgs.push_back( imread( getDataPath("stitching/a2.png") ) );
+    imgs.push_back( imread( getDataPath("stitching/a3.png") ) );
+
+    int bs = GetParam();
+
+    declare.time(30 * 10).iterations(10);
+
+    while(next())
+    {
+        Ptr<Stitcher> stitcher = Stitcher::create();
+        stitcher->setWarper(makePtr<SphericalWarper>());
+        stitcher->setRegistrationResol(WORK_MEGAPIX);
+        stitcher->setExposureCompensator(
+            makePtr<detail::BlocksGainCompensator>(bs, bs));
+
+        startTimer();
+        stitcher->stitch(imgs, pano);
+        stopTimer();
+    }
+
+    EXPECT_NEAR(pano.size().width, 1182, 50);
+    EXPECT_NEAR(pano.size().height, 682, 30);
+
+    SANITY_CHECK_NOTHING();
+}
+
 PERF_TEST_P(stitch, b12, TEST_DETECTORS)
 {
     Mat pano;