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

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

@@ -1390,11 +1390,21 @@ OPENCV_HAL_IMPL_AVX_CHECK_SHORT(v_int16x16)
 ////////// Other math /////////
 
 /** Some frequent operations **/
+#if CV_FMA3
 #define OPENCV_HAL_IMPL_AVX_MULADD(_Tpvec, suffix)                            \
     inline _Tpvec v_fma(const _Tpvec& a, const _Tpvec& b, const _Tpvec& c)    \
     { return _Tpvec(_mm256_fmadd_##suffix(a.val, b.val, c.val)); }            \
     inline _Tpvec v_muladd(const _Tpvec& a, const _Tpvec& b, const _Tpvec& c) \
-    { return _Tpvec(_mm256_fmadd_##suffix(a.val, b.val, c.val)); }            \
+    { return _Tpvec(_mm256_fmadd_##suffix(a.val, b.val, c.val)); }
+#else
+#define OPENCV_HAL_IMPL_AVX_MULADD(_Tpvec, suffix)                                    \
+    inline _Tpvec v_fma(const _Tpvec& a, const _Tpvec& b, const _Tpvec& c)            \
+    { return _Tpvec(_mm256_add_##suffix(_mm256_mul_##suffix(a.val, b.val), c.val)); } \
+    inline _Tpvec v_muladd(const _Tpvec& a, const _Tpvec& b, const _Tpvec& c)         \
+    { return _Tpvec(_mm256_add_##suffix(_mm256_mul_##suffix(a.val, b.val), c.val)); }
+#endif
+
+#define OPENCV_HAL_IMPL_AVX_MISC(_Tpvec, suffix)                              \
     inline _Tpvec v_sqrt(const _Tpvec& x)                                     \
     { return _Tpvec(_mm256_sqrt_##suffix(x.val)); }                           \
     inline _Tpvec v_sqr_magnitude(const _Tpvec& a, const _Tpvec& b)           \
@@ -1404,6 +1414,8 @@ OPENCV_HAL_IMPL_AVX_CHECK_SHORT(v_int16x16)
 
 OPENCV_HAL_IMPL_AVX_MULADD(v_float32x8, ps)
 OPENCV_HAL_IMPL_AVX_MULADD(v_float64x4, pd)
+OPENCV_HAL_IMPL_AVX_MISC(v_float32x8, ps)
+OPENCV_HAL_IMPL_AVX_MISC(v_float64x4, pd)
 
 inline v_int32x8 v_fma(const v_int32x8& a, const v_int32x8& b, const v_int32x8& c)
 {

modules/core/include/opencv2/core/hal/intrin_avx512.hpp

@@ -1385,11 +1385,21 @@ inline v_uint64x8  v_popcount(const v_uint64x8&  a) { return v_popcount(v_reinte
 ////////// Other math /////////
 
 /** Some frequent operations **/
+#if CV_FMA3
 #define OPENCV_HAL_IMPL_AVX512_MULADD(_Tpvec, suffix)                         \
     inline _Tpvec v_fma(const _Tpvec& a, const _Tpvec& b, const _Tpvec& c)    \
     { return _Tpvec(_mm512_fmadd_##suffix(a.val, b.val, c.val)); }            \
     inline _Tpvec v_muladd(const _Tpvec& a, const _Tpvec& b, const _Tpvec& c) \
-    { return _Tpvec(_mm512_fmadd_##suffix(a.val, b.val, c.val)); }            \
+    { return _Tpvec(_mm512_fmadd_##suffix(a.val, b.val, c.val)); }
+#else
+#define OPENCV_HAL_IMPL_AVX512_MULADD(_Tpvec, suffix)                                 \
+    inline _Tpvec v_fma(const _Tpvec& a, const _Tpvec& b, const _Tpvec& c)            \
+    { return _Tpvec(_mm512_add_##suffix(_mm512_mul_##suffix(a.val, b.val), c.val)); } \
+    inline _Tpvec v_muladd(const _Tpvec& a, const _Tpvec& b, const _Tpvec& c)         \
+    { return _Tpvec(_mm512_add_##suffix(_mm512_mul_##suffix(a.val, b.val), c.val)); }
+#endif
+
+#define OPENCV_HAL_IMPL_AVX512_MISC(_Tpvec, suffix)                           \
     inline _Tpvec v_sqrt(const _Tpvec& x)                                     \
     { return _Tpvec(_mm512_sqrt_##suffix(x.val)); }                           \
     inline _Tpvec v_sqr_magnitude(const _Tpvec& a, const _Tpvec& b)           \
@@ -1399,6 +1409,8 @@ inline v_uint64x8  v_popcount(const v_uint64x8&  a) { return v_popcount(v_reinte
 
 OPENCV_HAL_IMPL_AVX512_MULADD(v_float32x16, ps)
 OPENCV_HAL_IMPL_AVX512_MULADD(v_float64x8,  pd)
+OPENCV_HAL_IMPL_AVX512_MISC(v_float32x16, ps)
+OPENCV_HAL_IMPL_AVX512_MISC(v_float64x8,  pd)
 
 inline v_int32x16 v_fma(const v_int32x16& a, const v_int32x16& b, const v_int32x16& c)
 { return a * b + c; }

modules/dnn/CMakeLists.txt

@@ -14,9 +14,6 @@ ocv_add_dispatched_file_force_all("int8layers/layers_common" AVX2 AVX512_SKX)
 ocv_add_module(dnn opencv_core opencv_imgproc WRAP python java objc js)
 
 ocv_option(OPENCV_DNN_OPENCL "Build with OpenCL support" HAVE_OPENCL AND NOT APPLE)
-if(HAVE_TENGINE)
-  add_definitions(-DHAVE_TENGINE=1)
-endif()
 
 if(OPENCV_DNN_OPENCL AND HAVE_OPENCL)
   add_definitions(-DCV_OCL4DNN=1)
@@ -44,6 +41,10 @@ endif()
 
 ocv_cmake_hook_append(INIT_MODULE_SOURCES_opencv_dnn "${CMAKE_CURRENT_LIST_DIR}/cmake/hooks/INIT_MODULE_SOURCES_opencv_dnn.cmake")
 
+if(HAVE_TENGINE)
+  add_definitions(-DHAVE_TENGINE=1)
+endif()
+
 if(MSVC)
   add_definitions( -D_CRT_SECURE_NO_WARNINGS=1 )
   ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4244 /wd4267 /wd4018 /wd4355 /wd4800 /wd4251 /wd4996 /wd4146

modules/dnn/src/caffe/caffe_importer.cpp

@@ -49,6 +49,7 @@
 #include <google/protobuf/message.h>
 #include <google/protobuf/text_format.h>
 #include <google/protobuf/io/zero_copy_stream_impl.h>
+#include <google/protobuf/reflection.h>
 #include "caffe_io.hpp"
 #endif
 
@@ -57,8 +58,7 @@ namespace dnn {
 CV__DNN_INLINE_NS_BEGIN
 
 #ifdef HAVE_PROTOBUF
-using ::google::protobuf::RepeatedField;
-using ::google::protobuf::RepeatedPtrField;
+using ::google::protobuf::RepeatedFieldRef;
 using ::google::protobuf::Message;
 using ::google::protobuf::Descriptor;
 using ::google::protobuf::FieldDescriptor;
@@ -136,7 +136,7 @@ public:
 
         #define SET_UP_FILED(getter, arrayConstr, gtype)                                    \
             if (isRepeated) {                                                               \
-                const RepeatedField<gtype> &v = refl->GetRepeatedField<gtype>(msg, field);  \
+                const RepeatedFieldRef<gtype> v = refl->GetRepeatedFieldRef<gtype>(msg, field);  \
                 params.set(name, DictValue::arrayConstr(v.begin(), (int)v.size()));                  \
             }                                                                               \
             else {                                                                          \
@@ -168,7 +168,7 @@ public:
             break;
         case FieldDescriptor::CPPTYPE_STRING:
             if (isRepeated) {
-                const RepeatedPtrField<std::string> &v = refl->GetRepeatedPtrField<std::string>(msg, field);
+                const RepeatedFieldRef<std::string> v = refl->GetRepeatedFieldRef<std::string>(msg, field);
                 params.set(name, DictValue::arrayString(v.begin(), (int)v.size()));
             }
             else {

modules/dnn/src/tensorflow/tf_importer.cpp

@@ -2888,14 +2888,21 @@ DataLayout TFImporter::predictOutputDataLayout(const tensorflow::NodeDef& layer)
 
 void TFImporter::populateNet()
 {
-    CV_Assert(netBin.ByteSize() || netTxt.ByteSize());
+#if GOOGLE_PROTOBUF_VERSION < 3005000
+    size_t netBinSize = saturate_cast<size_t>(netBin.ByteSize());
+    size_t netTxtSize = saturate_cast<size_t>(netTxt.ByteSize());
+#else
+    size_t netBinSize = netBin.ByteSizeLong();
+    size_t netTxtSize = netTxt.ByteSizeLong();
+#endif
+    CV_Assert(netBinSize || netTxtSize);
 
     CV_LOG_INFO(NULL, "DNN/TF: parsing model"
         << (netBin.has_versions() ? cv::format(" produced by TF v%d (min_consumer=%d)", (int)netBin.versions().producer(), (int)netBin.versions().min_consumer()) : cv::String(" (N/A version info)"))
         << ". Number of nodes = " << netBin.node_size()
     );
 
-    if (netTxt.ByteSize())
+    if (netTxtSize)
     {
         CV_LOG_INFO(NULL, "DNN/TF: parsing config"
             << (netTxt.has_versions() ? cv::format(" produced by TF v%d (min_consumer=%d)", (int)netTxt.versions().producer(), (int)netTxt.versions().min_consumer()) : cv::String(" (N/A version info)"))
@@ -2924,7 +2931,7 @@ void TFImporter::populateNet()
         CV_LOG_DEBUG(NULL, "DNN/TF: sortByExecutionOrder(model) => " << netBin.node_size() << " nodes");
     }
 
-    tensorflow::GraphDef& net = netTxt.ByteSize() != 0 ? netTxt : netBin;
+    tensorflow::GraphDef& net = netTxtSize != 0 ? netTxt : netBin;
 
     int layersSize = net.node_size();
 
@@ -3027,7 +3034,12 @@ void TFImporter::addPermuteLayer(const int* order, const std::string& permName,
 
 void TFImporter::parseNode(const tensorflow::NodeDef& layer)
 {
-    tensorflow::GraphDef& net = netTxt.ByteSize() != 0 ? netTxt : netBin;
+#if GOOGLE_PROTOBUF_VERSION < 3005000
+    size_t netTxtSize = saturate_cast<size_t>(netTxt.ByteSize());
+#else
+    size_t netTxtSize = netTxt.ByteSizeLong();
+#endif
+    tensorflow::GraphDef& net = netTxtSize != 0 ? netTxt : netBin;
 
     const std::string& name = layer.name();
     const std::string& type = layer.op();

modules/imgproc/doc/colors.markdown

@@ -151,16 +151,23 @@ sources on the web, primarily from the Charles Poynton site <http://www.poynton.
 Bayer \f$\rightarrow\f$ RGB
 ---------------------------
 The Bayer pattern is widely used in CCD and CMOS cameras. It enables you to get color pictures
-from a single plane where R,G, and B pixels (sensors of a particular component) are interleaved
+from a single plane where R, G, and B pixels (sensors of a particular component) are interleaved
 as follows:
 
-![Bayer pattern](pics/bayer.png)
+![Bayer patterns (BGGR, GBRG, GRGB, RGGB)](pics/Bayer_patterns.png)
 
 The output RGB components of a pixel are interpolated from 1, 2, or 4 neighbors of the pixel
-having the same color. There are several modifications of the above pattern that can be achieved
+having the same color.
+
+@note See the following for information about correspondences between OpenCV Bayer pattern naming and classical Bayer pattern naming.
+
+![Bayer pattern](pics/bayer.png)
+
+There are several modifications of the above pattern that can be achieved
 by shifting the pattern one pixel left and/or one pixel up. The two letters \f$C_1\f$ and \f$C_2\f$ in
 the conversion constants CV_Bayer \f$C_1 C_2\f$ 2BGR and CV_Bayer \f$C_1 C_2\f$ 2RGB indicate the
 particular pattern type. These are components from the second row, second and third columns,
 respectively. For example, the above pattern has a very popular "BG" type.
 
-@see cv::COLOR_BayerBG2BGR, cv::COLOR_BayerGB2BGR, cv::COLOR_BayerRG2BGR, cv::COLOR_BayerGR2BGR, cv::COLOR_BayerBG2RGB, cv::COLOR_BayerGB2RGB, cv::COLOR_BayerRG2RGB, cv::COLOR_BayerGR2RGB
+@see cv::COLOR_BayerRGGB2BGR, cv::COLOR_BayerGRBG2BGR, cv::COLOR_BayerBGGR2BGR, cv::COLOR_BayerGBRG2BGR, cv::COLOR_BayerRGGB2RGB, cv::COLOR_BayerGRBG2RGB, cv::COLOR_BayerBGGR2RGB, cv::COLOR_BayerGBRG2RGB
+cv::COLOR_BayerBG2BGR, cv::COLOR_BayerGB2BGR, cv::COLOR_BayerRG2BGR, cv::COLOR_BayerGR2BGR, cv::COLOR_BayerBG2RGB, cv::COLOR_BayerGB2RGB, cv::COLOR_BayerRG2RGB, cv::COLOR_BayerGR2RGB

modules/imgproc/include/opencv2/imgproc.hpp

@@ -744,54 +744,99 @@ enum ColorConversionCodes {
     COLOR_RGBA2YUV_YV12 = 133,
     COLOR_BGRA2YUV_YV12 = 134,
 
-    //! Demosaicing
-    COLOR_BayerBG2BGR = 46,
-    COLOR_BayerGB2BGR = 47,
-    COLOR_BayerRG2BGR = 48,
-    COLOR_BayerGR2BGR = 49,
-
-    COLOR_BayerBG2RGB = COLOR_BayerRG2BGR,
-    COLOR_BayerGB2RGB = COLOR_BayerGR2BGR,
-    COLOR_BayerRG2RGB = COLOR_BayerBG2BGR,
-    COLOR_BayerGR2RGB = COLOR_BayerGB2BGR,
-
-    COLOR_BayerBG2GRAY = 86,
-    COLOR_BayerGB2GRAY = 87,
-    COLOR_BayerRG2GRAY = 88,
-    COLOR_BayerGR2GRAY = 89,
+    //! Demosaicing, see @ref color_convert_bayer "color conversions" for additional information
+    COLOR_BayerBG2BGR = 46, //!< equivalent to RGGB Bayer pattern
+    COLOR_BayerGB2BGR = 47, //!< equivalent to GRBG Bayer pattern
+    COLOR_BayerRG2BGR = 48, //!< equivalent to BGGR Bayer pattern
+    COLOR_BayerGR2BGR = 49, //!< equivalent to GBRG Bayer pattern
+
+    COLOR_BayerRGGB2BGR = COLOR_BayerBG2BGR,
+    COLOR_BayerGRBG2BGR = COLOR_BayerGB2BGR,
+    COLOR_BayerBGGR2BGR = COLOR_BayerRG2BGR,
+    COLOR_BayerGBRG2BGR = COLOR_BayerGR2BGR,
+
+    COLOR_BayerRGGB2RGB = COLOR_BayerBGGR2BGR,
+    COLOR_BayerGRBG2RGB = COLOR_BayerGBRG2BGR,
+    COLOR_BayerBGGR2RGB = COLOR_BayerRGGB2BGR,
+    COLOR_BayerGBRG2RGB = COLOR_BayerGRBG2BGR,
+
+    COLOR_BayerBG2RGB = COLOR_BayerRG2BGR, //!< equivalent to RGGB Bayer pattern
+    COLOR_BayerGB2RGB = COLOR_BayerGR2BGR, //!< equivalent to GRBG Bayer pattern
+    COLOR_BayerRG2RGB = COLOR_BayerBG2BGR, //!< equivalent to BGGR Bayer pattern
+    COLOR_BayerGR2RGB = COLOR_BayerGB2BGR, //!< equivalent to GBRG Bayer pattern
+
+    COLOR_BayerBG2GRAY = 86, //!< equivalent to RGGB Bayer pattern
+    COLOR_BayerGB2GRAY = 87, //!< equivalent to GRBG Bayer pattern
+    COLOR_BayerRG2GRAY = 88, //!< equivalent to BGGR Bayer pattern
+    COLOR_BayerGR2GRAY = 89, //!< equivalent to GBRG Bayer pattern
+
+    COLOR_BayerRGGB2GRAY = COLOR_BayerBG2GRAY,
+    COLOR_BayerGRBG2GRAY = COLOR_BayerGB2GRAY,
+    COLOR_BayerBGGR2GRAY = COLOR_BayerRG2GRAY,
+    COLOR_BayerGBRG2GRAY = COLOR_BayerGR2GRAY,
 
     //! Demosaicing using Variable Number of Gradients
-    COLOR_BayerBG2BGR_VNG = 62,
-    COLOR_BayerGB2BGR_VNG = 63,
-    COLOR_BayerRG2BGR_VNG = 64,
-    COLOR_BayerGR2BGR_VNG = 65,
-
-    COLOR_BayerBG2RGB_VNG = COLOR_BayerRG2BGR_VNG,
-    COLOR_BayerGB2RGB_VNG = COLOR_BayerGR2BGR_VNG,
-    COLOR_BayerRG2RGB_VNG = COLOR_BayerBG2BGR_VNG,
-    COLOR_BayerGR2RGB_VNG = COLOR_BayerGB2BGR_VNG,
+    COLOR_BayerBG2BGR_VNG = 62, //!< equivalent to RGGB Bayer pattern
+    COLOR_BayerGB2BGR_VNG = 63, //!< equivalent to GRBG Bayer pattern
+    COLOR_BayerRG2BGR_VNG = 64, //!< equivalent to BGGR Bayer pattern
+    COLOR_BayerGR2BGR_VNG = 65, //!< equivalent to GBRG Bayer pattern
+
+    COLOR_BayerRGGB2BGR_VNG = COLOR_BayerBG2BGR_VNG,
+    COLOR_BayerGRBG2BGR_VNG = COLOR_BayerGB2BGR_VNG,
+    COLOR_BayerBGGR2BGR_VNG = COLOR_BayerRG2BGR_VNG,
+    COLOR_BayerGBRG2BGR_VNG = COLOR_BayerGR2BGR_VNG,
+
+    COLOR_BayerRGGB2RGB_VNG = COLOR_BayerBGGR2BGR_VNG,
+    COLOR_BayerGRBG2RGB_VNG = COLOR_BayerGBRG2BGR_VNG,
+    COLOR_BayerBGGR2RGB_VNG = COLOR_BayerRGGB2BGR_VNG,
+    COLOR_BayerGBRG2RGB_VNG = COLOR_BayerGRBG2BGR_VNG,
+
+    COLOR_BayerBG2RGB_VNG = COLOR_BayerRG2BGR_VNG, //!< equivalent to RGGB Bayer pattern
+    COLOR_BayerGB2RGB_VNG = COLOR_BayerGR2BGR_VNG, //!< equivalent to GRBG Bayer pattern
+    COLOR_BayerRG2RGB_VNG = COLOR_BayerBG2BGR_VNG, //!< equivalent to BGGR Bayer pattern
+    COLOR_BayerGR2RGB_VNG = COLOR_BayerGB2BGR_VNG, //!< equivalent to GBRG Bayer pattern
 
     //! Edge-Aware Demosaicing
-    COLOR_BayerBG2BGR_EA  = 135,
-    COLOR_BayerGB2BGR_EA  = 136,
-    COLOR_BayerRG2BGR_EA  = 137,
-    COLOR_BayerGR2BGR_EA  = 138,
-
-    COLOR_BayerBG2RGB_EA  = COLOR_BayerRG2BGR_EA,
-    COLOR_BayerGB2RGB_EA  = COLOR_BayerGR2BGR_EA,
-    COLOR_BayerRG2RGB_EA  = COLOR_BayerBG2BGR_EA,
-    COLOR_BayerGR2RGB_EA  = COLOR_BayerGB2BGR_EA,
+    COLOR_BayerBG2BGR_EA  = 135, //!< equivalent to RGGB Bayer pattern
+    COLOR_BayerGB2BGR_EA  = 136, //!< equivalent to GRBG Bayer pattern
+    COLOR_BayerRG2BGR_EA  = 137, //!< equivalent to BGGR Bayer pattern
+    COLOR_BayerGR2BGR_EA  = 138, //!< equivalent to GBRG Bayer pattern
+
+    COLOR_BayerRGGB2BGR_EA  = COLOR_BayerBG2BGR_EA,
+    COLOR_BayerGRBG2BGR_EA  = COLOR_BayerGB2BGR_EA,
+    COLOR_BayerBGGR2BGR_EA  = COLOR_BayerRG2BGR_EA,
+    COLOR_BayerGBRG2BGR_EA  = COLOR_BayerGR2BGR_EA,
+
+    COLOR_BayerRGGB2RGB_EA  = COLOR_BayerBGGR2BGR_EA,
+    COLOR_BayerGRBG2RGB_EA  = COLOR_BayerGBRG2BGR_EA,
+    COLOR_BayerBGGR2RGB_EA  = COLOR_BayerRGGB2BGR_EA,
+    COLOR_BayerGBRG2RGB_EA  = COLOR_BayerGRBG2BGR_EA,
+
+    COLOR_BayerBG2RGB_EA  = COLOR_BayerRG2BGR_EA, //!< equivalent to RGGB Bayer pattern
+    COLOR_BayerGB2RGB_EA  = COLOR_BayerGR2BGR_EA, //!< equivalent to GRBG Bayer pattern
+    COLOR_BayerRG2RGB_EA  = COLOR_BayerBG2BGR_EA, //!< equivalent to BGGR Bayer pattern
+    COLOR_BayerGR2RGB_EA  = COLOR_BayerGB2BGR_EA, //!< equivalent to GBRG Bayer pattern
 
     //! Demosaicing with alpha channel
-    COLOR_BayerBG2BGRA = 139,
-    COLOR_BayerGB2BGRA = 140,
-    COLOR_BayerRG2BGRA = 141,
-    COLOR_BayerGR2BGRA = 142,
-
-    COLOR_BayerBG2RGBA = COLOR_BayerRG2BGRA,
-    COLOR_BayerGB2RGBA = COLOR_BayerGR2BGRA,
-    COLOR_BayerRG2RGBA = COLOR_BayerBG2BGRA,
-    COLOR_BayerGR2RGBA = COLOR_BayerGB2BGRA,
+    COLOR_BayerBG2BGRA = 139, //!< equivalent to RGGB Bayer pattern
+    COLOR_BayerGB2BGRA = 140, //!< equivalent to GRBG Bayer pattern
+    COLOR_BayerRG2BGRA = 141, //!< equivalent to BGGR Bayer pattern
+    COLOR_BayerGR2BGRA = 142, //!< equivalent to GBRG Bayer pattern
+
+    COLOR_BayerRGGB2BGRA = COLOR_BayerBG2BGRA,
+    COLOR_BayerGRBG2BGRA = COLOR_BayerGB2BGRA,
+    COLOR_BayerBGGR2BGRA = COLOR_BayerRG2BGRA,
+    COLOR_BayerGBRG2BGRA = COLOR_BayerGR2BGRA,
+
+    COLOR_BayerRGGB2RGBA = COLOR_BayerBGGR2BGRA,
+    COLOR_BayerGRBG2RGBA = COLOR_BayerGBRG2BGRA,
+    COLOR_BayerBGGR2RGBA = COLOR_BayerRGGB2BGRA,
+    COLOR_BayerGBRG2RGBA = COLOR_BayerGRBG2BGRA,
+
+    COLOR_BayerBG2RGBA = COLOR_BayerRG2BGRA, //!< equivalent to RGGB Bayer pattern
+    COLOR_BayerGB2RGBA = COLOR_BayerGR2BGRA, //!< equivalent to GRBG Bayer pattern
+    COLOR_BayerRG2RGBA = COLOR_BayerBG2BGRA, //!< equivalent to BGGR Bayer pattern
+    COLOR_BayerGR2RGBA = COLOR_BayerGB2BGRA, //!< equivalent to GBRG Bayer pattern
 
     COLOR_COLORCVT_MAX  = 143
 };

modules/objdetect/src/qrcode.cpp

@@ -200,7 +200,7 @@ vector<Vec3d> QRDetect::searchHorizontalLines()
             }
         }
         pixels_position.push_back(width_bin_barcode - 1);
-        for (size_t i = 2; i < pixels_position.size() - 4; i+=2)
+        for (size_t i = 2; i < pixels_position.size() - 3; i+=2)
         {
             test_lines[0] = static_cast<double>(pixels_position[i - 1] - pixels_position[i - 2]);
             test_lines[1] = static_cast<double>(pixels_position[i    ] - pixels_position[i - 1]);

modules/objdetect/test/test_qrcode.cpp

@@ -649,6 +649,26 @@ TEST(Objdetect_QRCode_decodeMulti, check_output_parameters_type_19363)
 #endif
 }
 
+TEST(Objdetect_QRCode_detect, detect_regression_20882)
+{
+    const std::string name_current_image = "qrcode_near_the_end.jpg";
+    const std::string root = "qrcode/";
+
+    std::string image_path = findDataFile(root + name_current_image);
+    Mat src = imread(image_path);
+    ASSERT_FALSE(src.empty()) << "Can't read image: " << image_path;
+
+    QRCodeDetector qrcode;
+    std::vector<Point> corners;
+    Mat straight_barcode;
+    cv::String decoded_info;
+    EXPECT_TRUE(qrcode.detect(src, corners));
+    EXPECT_TRUE(!corners.empty());
+#ifdef HAVE_QUIRC
+    EXPECT_NO_THROW(qrcode.decode(src, corners, straight_barcode));
+#endif
+}
+
 TEST(Objdetect_QRCode_basic, not_found_qrcode)
 {
     std::vector<Point> corners;

modules/videoio/src/cap_dshow.cpp

@@ -93,8 +93,9 @@ Thanks to:
 #pragma warning(disable: 4995)
 #endif
 
-#ifdef __MINGW32__
-// MinGW does not understand COM interfaces
+#if defined(__clang__)  // clang or MSVC clang
+#pragma clang diagnostic ignored "-Wnon-virtual-dtor"
+#elif defined(__GNUC__) // MinGW
 #pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
 #define STRSAFE_NO_DEPRECATE
 #endif