diff --git a/modules/core/src/command_line_parser.cpp b/modules/core/src/command_line_parser.cpp
index f324d87c15..13bd6c14d4 100644
--- a/modules/core/src/command_line_parser.cpp
+++ b/modules/core/src/command_line_parser.cpp
@@ -149,7 +149,7 @@ void CommandLineParser::getByName(const String& name, bool space_delete, int typ
             }
         }
     }
-    catch (Exception& e)
+    catch (const Exception& e)
     {
         impl->error = true;
         impl->error_message = impl->error_message + "Parameter '"+ name + "': " + e.err + "\n";
@@ -182,7 +182,7 @@ void CommandLineParser::getByIndex(int index, bool space_delete, int type, void*
             }
         }
     }
-    catch(Exception& e)
+    catch (const Exception& e)
     {
         impl->error = true;
         impl->error_message = impl->error_message + format("Parameter #%d: ", index) + e.err + "\n";
diff --git a/modules/core/src/lut.cpp b/modules/core/src/lut.cpp
index 39f847347e..811cb2a7e6 100644
--- a/modules/core/src/lut.cpp
+++ b/modules/core/src/lut.cpp
@@ -120,11 +120,11 @@ static bool openvx_LUT(Mat src, Mat dst, Mat _lut)
         lut.copyFrom(_lut);
         ivx::IVX_CHECK_STATUS(vxuTableLookup(ctx, ia, lut, ib));
     }
-    catch (ivx::RuntimeError & e)
+    catch (const ivx::RuntimeError& e)
     {
         VX_DbgThrow(e.what());
     }
-    catch (ivx::WrapperError & e)
+    catch (const ivx::WrapperError& e)
     {
         VX_DbgThrow(e.what());
     }
diff --git a/modules/core/src/mean.cpp b/modules/core/src/mean.cpp
index aed5f76ac5..e22bcc7fe5 100644
--- a/modules/core/src/mean.cpp
+++ b/modules/core/src/mean.cpp
@@ -648,11 +648,11 @@ static bool ocl_meanStdDev( InputArray _src, OutputArray _mean, OutputArray _sdv
                     pstddev[c] = 0;
             }
         }
-        catch (ivx::RuntimeError & e)
+        catch (const ivx::RuntimeError & e)
         {
             VX_DbgThrow(e.what());
         }
-        catch (ivx::WrapperError & e)
+        catch (const ivx::WrapperError & e)
         {
             VX_DbgThrow(e.what());
         }
diff --git a/modules/core/src/minmax.cpp b/modules/core/src/minmax.cpp
index daad21038d..19ed119ad8 100644
--- a/modules/core/src/minmax.cpp
+++ b/modules/core/src/minmax.cpp
@@ -433,11 +433,11 @@ static bool openvx_minMaxIdx(Mat &src, double* minVal, double* maxVal, int* minI
             ofs2idx(src, maxidx, maxIdx);
         }
     }
-    catch (ivx::RuntimeError & e)
+    catch (const ivx::RuntimeError & e)
     {
         VX_DbgThrow(e.what());
     }
-    catch (ivx::WrapperError & e)
+    catch (const ivx::WrapperError & e)
     {
         VX_DbgThrow(e.what());
     }
diff --git a/modules/core/src/persistence_c.cpp b/modules/core/src/persistence_c.cpp
index ed349cc150..d36cae3297 100644
--- a/modules/core/src/persistence_c.cpp
+++ b/modules/core/src/persistence_c.cpp
@@ -417,7 +417,7 @@ cvOpenFileStorage( const char* query, CvMemStorage* dststorage, int flags, const
 
         //mode = cvGetErrMode();
         //cvSetErrMode( CV_ErrModeSilent );
-        CV_TRY
+        try
         {
             switch (fs->fmt)
             {
@@ -427,7 +427,7 @@ cvOpenFileStorage( const char* query, CvMemStorage* dststorage, int flags, const
             default: break;
             }
         }
-        CV_CATCH_ALL
+        catch (...)
         {
             fs->is_opened = true;
             cvReleaseFileStorage( &fs );
diff --git a/modules/core/src/persistence_types.cpp b/modules/core/src/persistence_types.cpp
index 86a50aa0f3..a446645734 100644
--- a/modules/core/src/persistence_types.cpp
+++ b/modules/core/src/persistence_types.cpp
@@ -756,11 +756,11 @@ static void* icvReadSeq( CvFileStorage* fs, CvFileNode* node )
             flags |= CV_SEQ_FLAG_HOLE;
         if( !strstr(flags_str, "untyped") )
         {
-            CV_TRY
+            try
             {
                 flags |= icvDecodeSimpleFormat(dt);
             }
-            CV_CATCH_ALL
+            catch (...)
             {
             }
         }
diff --git a/modules/features2d/src/fast.cpp b/modules/features2d/src/fast.cpp
index 125864d0f8..2c69bbf670 100644
--- a/modules/features2d/src/fast.cpp
+++ b/modules/features2d/src/fast.cpp
@@ -401,11 +401,11 @@ static bool openvx_FAST(InputArray _img, std::vector<KeyPoint>& keypoints,
         img.swapHandle();
 #endif
     }
-    catch (RuntimeError & e)
+    catch (const RuntimeError & e)
     {
         VX_DbgThrow(e.what());
     }
-    catch (WrapperError & e)
+    catch (const WrapperError & e)
     {
         VX_DbgThrow(e.what());
     }
diff --git a/modules/imgproc/src/accum.cpp b/modules/imgproc/src/accum.cpp
index 39e942e8cd..fbd5223c13 100644
--- a/modules/imgproc/src/accum.cpp
+++ b/modules/imgproc/src/accum.cpp
@@ -291,11 +291,11 @@ static bool openvx_accumulate(InputArray _src, InputOutputArray _dst, InputArray
         srcImage.swapHandle(); dstImage.swapHandle();
 #endif
     }
-    catch (ivx::RuntimeError & e)
+    catch (const ivx::RuntimeError & e)
     {
         VX_DbgThrow(e.what());
     }
-    catch (ivx::WrapperError & e)
+    catch (const ivx::WrapperError & e)
     {
         VX_DbgThrow(e.what());
     }
diff --git a/modules/imgproc/src/box_filter.cpp b/modules/imgproc/src/box_filter.cpp
index 7b20abb850..14f266258f 100644
--- a/modules/imgproc/src/box_filter.cpp
+++ b/modules/imgproc/src/box_filter.cpp
@@ -1559,11 +1559,11 @@ namespace cv
             ivx::IVX_CHECK_STATUS(vxuBox3x3(ctx, ia, ib));
             ctx.setImmediateBorder(prevBorder);
         }
-        catch (ivx::RuntimeError & e)
+        catch (const ivx::RuntimeError & e)
         {
             VX_DbgThrow(e.what());
         }
-        catch (ivx::WrapperError & e)
+        catch (const ivx::WrapperError & e)
         {
             VX_DbgThrow(e.what());
         }
diff --git a/modules/imgproc/src/deriv.cpp b/modules/imgproc/src/deriv.cpp
index b83feceda9..5001591989 100644
--- a/modules/imgproc/src/deriv.cpp
+++ b/modules/imgproc/src/deriv.cpp
@@ -246,11 +246,11 @@ namespace cv
                 ivx::IVX_CHECK_STATUS(vxuSobel3x3(ctx, ia, NULL, ib));
             ctx.setImmediateBorder(prevBorder);
         }
-        catch (ivx::RuntimeError & e)
+        catch (const ivx::RuntimeError & e)
         {
             VX_DbgThrow(e.what());
         }
-        catch (ivx::WrapperError & e)
+        catch (const ivx::WrapperError & e)
         {
             VX_DbgThrow(e.what());
         }
diff --git a/modules/imgproc/src/featureselect.cpp b/modules/imgproc/src/featureselect.cpp
index 1500387b80..7462bd8cc5 100644
--- a/modules/imgproc/src/featureselect.cpp
+++ b/modules/imgproc/src/featureselect.cpp
@@ -342,11 +342,11 @@ static bool openvx_harris(Mat image, OutputArray _corners,
         ovxImage.swapHandle();
 #endif
     }
-    catch (RuntimeError & e)
+    catch (const RuntimeError & e)
     {
         VX_DbgThrow(e.what());
     }
-    catch (WrapperError & e)
+    catch (const WrapperError & e)
     {
         VX_DbgThrow(e.what());
     }
diff --git a/modules/imgproc/src/histogram.cpp b/modules/imgproc/src/histogram.cpp
index 59384fce7d..60cb3630ce 100644
--- a/modules/imgproc/src/histogram.cpp
+++ b/modules/imgproc/src/histogram.cpp
@@ -793,11 +793,11 @@ namespace cv
             img.swapHandle();
 #endif
         }
-        catch (ivx::RuntimeError & e)
+        catch (const ivx::RuntimeError & e)
         {
             VX_DbgThrow(e.what());
         }
-        catch (ivx::WrapperError & e)
+        catch (const ivx::WrapperError & e)
         {
             VX_DbgThrow(e.what());
         }
@@ -3313,11 +3313,11 @@ static bool openvx_equalize_hist(Mat srcMat, Mat dstMat)
         srcImage.swapHandle(); dstImage.swapHandle();
 #endif
     }
-    catch (RuntimeError & e)
+    catch (const RuntimeError & e)
     {
         VX_DbgThrow(e.what());
     }
-    catch (WrapperError & e)
+    catch (const WrapperError & e)
     {
         VX_DbgThrow(e.what());
     }
diff --git a/modules/imgproc/src/imgwarp.cpp b/modules/imgproc/src/imgwarp.cpp
index c9957d6270..62f5ab81fc 100644
--- a/modules/imgproc/src/imgwarp.cpp
+++ b/modules/imgproc/src/imgwarp.cpp
@@ -1598,12 +1598,12 @@ static bool openvx_remap(Mat src, Mat dst, Mat map1, Mat map2, int interpolation
 
         ctx.setImmediateBorder(prevBorder);
     }
-    catch (ivx::RuntimeError & e)
+    catch (const ivx::RuntimeError & e)
     {
         CV_Error(CV_StsInternal, e.what());
         return false;
     }
-    catch (ivx::WrapperError & e)
+    catch (const ivx::WrapperError & e)
     {
         CV_Error(CV_StsInternal, e.what());
         return false;
diff --git a/modules/imgproc/src/median_blur.cpp b/modules/imgproc/src/median_blur.cpp
index 07d5ae2e6d..104e846ab2 100644
--- a/modules/imgproc/src/median_blur.cpp
+++ b/modules/imgproc/src/median_blur.cpp
@@ -1068,11 +1068,11 @@ static bool openvx_medianFilter(InputArray _src, OutputArray _dst, int ksize)
 #endif
         ctx.setImmediateBorder(prevBorder);
     }
-    catch (ivx::RuntimeError & e)
+    catch (const ivx::RuntimeError & e)
     {
         VX_DbgThrow(e.what());
     }
-    catch (ivx::WrapperError & e)
+    catch (const ivx::WrapperError & e)
     {
         VX_DbgThrow(e.what());
     }
diff --git a/modules/imgproc/src/pyramids.cpp b/modules/imgproc/src/pyramids.cpp
index f5fead4ce0..e2cd925bc1 100644
--- a/modules/imgproc/src/pyramids.cpp
+++ b/modules/imgproc/src/pyramids.cpp
@@ -861,11 +861,11 @@ static bool openvx_pyrDown( InputArray _src, OutputArray _dst, const Size& _dsz,
         srcImg.swapHandle(); dstImg.swapHandle();
 #endif
     }
-    catch (RuntimeError & e)
+    catch (const RuntimeError & e)
     {
         VX_DbgThrow(e.what());
     }
-    catch (WrapperError & e)
+    catch (const WrapperError & e)
     {
         VX_DbgThrow(e.what());
     }
diff --git a/modules/imgproc/src/smooth.cpp b/modules/imgproc/src/smooth.cpp
index a4292b6089..17f62c5742 100644
--- a/modules/imgproc/src/smooth.cpp
+++ b/modules/imgproc/src/smooth.cpp
@@ -2305,11 +2305,11 @@ static bool openvx_gaussianBlur(InputArray _src, OutputArray _dst, Size ksize,
         ivx::IVX_CHECK_STATUS(vxuGaussian3x3(ctx, ia, ib));
         ctx.setImmediateBorder(prevBorder);
     }
-    catch (ivx::RuntimeError & e)
+    catch (const ivx::RuntimeError & e)
     {
         VX_DbgThrow(e.what());
     }
-    catch (ivx::WrapperError & e)
+    catch (const ivx::WrapperError & e)
     {
         VX_DbgThrow(e.what());
     }
diff --git a/modules/imgproc/src/thresh.cpp b/modules/imgproc/src/thresh.cpp
index b411b8696d..9c6168916d 100644
--- a/modules/imgproc/src/thresh.cpp
+++ b/modules/imgproc/src/thresh.cpp
@@ -1374,11 +1374,11 @@ static bool openvx_threshold(Mat src, Mat dst, int thresh, int maxval, int type)
         }
 #endif
     }
-    catch (ivx::RuntimeError & e)
+    catch (const ivx::RuntimeError & e)
     {
         VX_DbgThrow(e.what());
     }
-    catch (ivx::WrapperError & e)
+    catch (const ivx::WrapperError & e)
     {
         VX_DbgThrow(e.what());
     }
diff --git a/modules/objdetect/src/detection_based_tracker.cpp b/modules/objdetect/src/detection_based_tracker.cpp
index 53b439499e..5a6ccce328 100644
--- a/modules/objdetect/src/detection_based_tracker.cpp
+++ b/modules/objdetect/src/detection_based_tracker.cpp
@@ -287,9 +287,9 @@ bool cv::DetectionBasedTracker::SeparateDetectionWork::run()
     try {                                                                                   \
         _block;                                                                             \
     }                                                                                       \
-    catch(cv::Exception& e) {                                                               \
+    catch(const cv::Exception& e) {                                                         \
         LOGE0("\n %s: ERROR: OpenCV Exception caught: \n'%s'\n\n", CV_Func, e.what());      \
-    } catch(std::exception& e) {                                                            \
+    } catch(const std::exception& e) {                                                      \
         LOGE0("\n %s: ERROR: Exception caught: \n'%s'\n\n", CV_Func, e.what());             \
     } catch(...) {                                                                          \
         LOGE0("\n %s: ERROR: UNKNOWN Exception caught\n\n", CV_Func);                       \
diff --git a/modules/ts/include/opencv2/ts/ts_ext.hpp b/modules/ts/include/opencv2/ts/ts_ext.hpp
index 265db94123..6a2f16dfac 100644
--- a/modules/ts/include/opencv2/ts/ts_ext.hpp
+++ b/modules/ts/include/opencv2/ts/ts_ext.hpp
@@ -36,7 +36,7 @@ extern int testThreads;
           Body(); \
           CV__TEST_CLEANUP \
        } \
-       catch (cvtest::SkipTestException& e) \
+       catch (const cvtest::SkipTestException& e) \
        { \
           printf("[     SKIP ] %s\n", e.what()); \
        } \
@@ -84,7 +84,7 @@ extern int testThreads;
           Body(); \
           CV__TEST_CLEANUP \
        } \
-       catch (cvtest::SkipTestException& e) \
+       catch (const cvtest::SkipTestException& e) \
        { \
           printf("[     SKIP ] %s\n", e.what()); \
        } \
diff --git a/modules/ts/src/ts_perf.cpp b/modules/ts/src/ts_perf.cpp
index 7bf60af716..3f55939972 100644
--- a/modules/ts/src/ts_perf.cpp
+++ b/modules/ts/src/ts_perf.cpp
@@ -232,7 +232,7 @@ void Regression::init(const std::string& testSuitName, const std::string& ext)
             storageOutPath += ext;
         }
     }
-    catch(cv::Exception&)
+    catch(const cv::Exception&)
     {
         LOGE("Failed to open sanity data for reading: %s", storageInPath.c_str());
     }
@@ -1987,22 +1987,22 @@ void TestBase::RunPerfTestBody()
             implConf.GetImpl();
 #endif
     }
-    catch(SkipTestException&)
+    catch(const SkipTestException&)
     {
         metrics.terminationReason = performance_metrics::TERM_SKIP_TEST;
         return;
     }
-    catch(PerfSkipTestException&)
+    catch(const PerfSkipTestException&)
     {
         metrics.terminationReason = performance_metrics::TERM_SKIP_TEST;
         return;
     }
-    catch(PerfEarlyExitException&)
+    catch(const PerfEarlyExitException&)
     {
         metrics.terminationReason = performance_metrics::TERM_INTERRUPT;
         return;//no additional failure logging
     }
-    catch(cv::Exception& e)
+    catch(const cv::Exception& e)
     {
         metrics.terminationReason = performance_metrics::TERM_EXCEPTION;
         #ifdef HAVE_CUDA
@@ -2011,7 +2011,7 @@ void TestBase::RunPerfTestBody()
         #endif
         FAIL() << "Expected: PerfTestBody() doesn't throw an exception.\n  Actual: it throws cv::Exception:\n  " << e.what();
     }
-    catch(std::exception& e)
+    catch(const std::exception& e)
     {
         metrics.terminationReason = performance_metrics::TERM_EXCEPTION;
         FAIL() << "Expected: PerfTestBody() doesn't throw an exception.\n  Actual: it throws std::exception:\n  " << e.what();
diff --git a/modules/video/src/lkpyramid.cpp b/modules/video/src/lkpyramid.cpp
index 013a4194ad..730fc36064 100644
--- a/modules/video/src/lkpyramid.cpp
+++ b/modules/video/src/lkpyramid.cpp
@@ -1191,11 +1191,11 @@ namespace
         prevImg.swapHandle(); nextImg.swapHandle();
 #endif
         }
-        catch (RuntimeError & e)
+        catch (const RuntimeError & e)
         {
             VX_DbgThrow(e.what());
         }
-        catch (WrapperError & e)
+        catch (const WrapperError & e)
         {
             VX_DbgThrow(e.what());
         }
diff --git a/modules/videoio/src/cap_cmu.cpp b/modules/videoio/src/cap_cmu.cpp
index a98fec8632..a9a499b4cd 100644
--- a/modules/videoio/src/cap_cmu.cpp
+++ b/modules/videoio/src/cap_cmu.cpp
@@ -362,7 +362,7 @@ bool CvCaptureCAM_CMU::open( int _index )
         CMU_numActiveCameras++;
         CMU_useCameraFlags[_index] = true;
     }
-    catch ( int )
+    catch (const int &)
     {
         return false;
     }
diff --git a/modules/videoio/src/cap_gphoto2.cpp b/modules/videoio/src/cap_gphoto2.cpp
index cab67b2b6d..d207cbab1c 100644
--- a/modules/videoio/src/cap_gphoto2.cpp
+++ b/modules/videoio/src/cap_gphoto2.cpp
@@ -70,7 +70,7 @@ public:
         return gp_result_as_string(result);
     }
     friend std::ostream & operator<<(std::ostream & ostream,
-            GPhoto2Exception & e)
+            const GPhoto2Exception & e)
     {
         return ostream << e.method << ": " << e.what();
     }
@@ -336,7 +336,7 @@ void DigitalCameraCapture::initContext()
         CR(gp_camera_autodetect(allDevices, context));
         CR(numDevices = gp_list_count(allDevices));
     }
-    catch (GPhoto2Exception & e)
+    catch (const GPhoto2Exception & e)
     {
         numDevices = 0;
     }
@@ -389,7 +389,7 @@ DigitalCameraCapture::~DigitalCameraCapture()
         gp_context_unref(context);
         context = NULL;
     }
-    catch (GPhoto2Exception & e)
+    catch (const GPhoto2Exception & e)
     {
         message(ERROR, "destruction error", e);
     }
@@ -442,7 +442,7 @@ bool DigitalCameraCapture::open(int index)
         opened = true;
         return true;
     }
-    catch (GPhoto2Exception & e)
+    catch (const GPhoto2Exception & e)
     {
         message(WARNING, "opening device failed", e);
         return false;
@@ -491,7 +491,7 @@ void DigitalCameraCapture::close()
             rootWidget = NULL;
         }
     }
-    catch (GPhoto2Exception & e)
+    catch (const GPhoto2Exception & e)
     {
         message(ERROR, "cannot close device properly", e);
     }
@@ -664,7 +664,7 @@ double DigitalCameraCapture::getProperty(int propertyId) const
             }
         }
     }
-    catch (GPhoto2Exception & e)
+    catch (const GPhoto2Exception & e)
     {
         char buf[128] = "";
         sprintf(buf, "cannot get property: %d", propertyId);
@@ -807,7 +807,7 @@ bool DigitalCameraCapture::setProperty(int propertyId, double value)
             CR(gp_widget_set_changed(widget, 0));
         }
     }
-    catch (GPhoto2Exception & e)
+    catch (const GPhoto2Exception & e)
     {
         char buf[128] = "";
         sprintf(buf, "cannot set property: %d to %f", propertyId, value);
@@ -849,7 +849,7 @@ bool DigitalCameraCapture::grabFrame()
         capturedFrames++;
         grabbedFrames.push_back(file);
     }
-    catch (GPhoto2Exception & e)
+    catch (const GPhoto2Exception & e)
     {
         if (file)
             gp_file_unref(file);
@@ -873,7 +873,7 @@ bool DigitalCameraCapture::retrieveFrame(int, OutputArray outputFrame)
             readFrameFromFile(file, outputFrame);
             CR(gp_file_unref(file));
         }
-        catch (GPhoto2Exception & e)
+        catch (const GPhoto2Exception & e)
         {
             message(WARNING, "cannot read file grabbed from device", e);
             return false;
@@ -914,7 +914,7 @@ int DigitalCameraCapture::findDevice(const char * deviceName) const
             }
         }
     }
-    catch (GPhoto2Exception & e)
+    catch (const GPhoto2Exception & e)
     {
         ; // pass
     }
@@ -980,7 +980,7 @@ CameraWidget * DigitalCameraCapture::findWidgetByName(
             }
             return (it != end) ? it->second : NULL;
         }
-        catch (GPhoto2Exception & e)
+        catch (const GPhoto2Exception & e)
         {
             message(WARNING, "error while searching for widget", e);
         }
diff --git a/samples/android/face-detection/jni/DetectionBasedTracker_jni.cpp b/samples/android/face-detection/jni/DetectionBasedTracker_jni.cpp
index 7d198dc53e..ef8c26f85b 100644
--- a/samples/android/face-detection/jni/DetectionBasedTracker_jni.cpp
+++ b/samples/android/face-detection/jni/DetectionBasedTracker_jni.cpp
@@ -88,7 +88,7 @@ JNIEXPORT jlong JNICALL Java_org_opencv_samples_facedetect_DetectionBasedTracker
             //trackingDetector->setMinObjectSize(Size(faceSize, faceSize));
         }
     }
-    catch(cv::Exception& e)
+    catch(const cv::Exception& e)
     {
         LOGD("nativeCreateObject caught cv::Exception: %s", e.what());
         jclass je = jenv->FindClass("org/opencv/core/CvException");
@@ -121,7 +121,7 @@ JNIEXPORT void JNICALL Java_org_opencv_samples_facedetect_DetectionBasedTracker_
             delete (DetectorAgregator*)thiz;
         }
     }
-    catch(cv::Exception& e)
+    catch(const cv::Exception& e)
     {
         LOGD("nativeestroyObject caught cv::Exception: %s", e.what());
         jclass je = jenv->FindClass("org/opencv/core/CvException");
@@ -147,7 +147,7 @@ JNIEXPORT void JNICALL Java_org_opencv_samples_facedetect_DetectionBasedTracker_
     {
         ((DetectorAgregator*)thiz)->tracker->run();
     }
-    catch(cv::Exception& e)
+    catch(const cv::Exception& e)
     {
         LOGD("nativeStart caught cv::Exception: %s", e.what());
         jclass je = jenv->FindClass("org/opencv/core/CvException");
@@ -173,7 +173,7 @@ JNIEXPORT void JNICALL Java_org_opencv_samples_facedetect_DetectionBasedTracker_
     {
         ((DetectorAgregator*)thiz)->tracker->stop();
     }
-    catch(cv::Exception& e)
+    catch(const cv::Exception& e)
     {
         LOGD("nativeStop caught cv::Exception: %s", e.what());
         jclass je = jenv->FindClass("org/opencv/core/CvException");
@@ -203,7 +203,7 @@ JNIEXPORT void JNICALL Java_org_opencv_samples_facedetect_DetectionBasedTracker_
             //((DetectorAgregator*)thiz)->trackingDetector->setMinObjectSize(Size(faceSize, faceSize));
         }
     }
-    catch(cv::Exception& e)
+    catch(const cv::Exception& e)
     {
         LOGD("nativeStop caught cv::Exception: %s", e.what());
         jclass je = jenv->FindClass("org/opencv/core/CvException");
@@ -233,7 +233,7 @@ JNIEXPORT void JNICALL Java_org_opencv_samples_facedetect_DetectionBasedTracker_
         ((DetectorAgregator*)thiz)->tracker->getObjects(RectFaces);
         *((Mat*)faces) = Mat(RectFaces, true);
     }
-    catch(cv::Exception& e)
+    catch(const cv::Exception& e)
     {
         LOGD("nativeCreateObject caught cv::Exception: %s", e.what());
         jclass je = jenv->FindClass("org/opencv/core/CvException");
diff --git a/samples/android/tutorial-4-opencl/jni/CLprocessor.cpp b/samples/android/tutorial-4-opencl/jni/CLprocessor.cpp
index b71dc10182..27b878b3fa 100644
--- a/samples/android/tutorial-4-opencl/jni/CLprocessor.cpp
+++ b/samples/android/tutorial-4-opencl/jni/CLprocessor.cpp
@@ -63,11 +63,11 @@ void dumpCLinfo()
                   i, name.c_str(), (type==CL_DEVICE_TYPE_GPU ? "GPU" : "CPU"), extensions.c_str() );
         }
     }
-    catch(cl::Error& e)
+    catch(const cl::Error& e)
     {
         LOGE( "OpenCL info: error while gathering OpenCL info: %s (%d)", e.what(), e.err() );
     }
-    catch(std::exception& e)
+    catch(const std::exception& e)
     {
         LOGE( "OpenCL info: error while gathering OpenCL info: %s", e.what() );
     }
@@ -130,11 +130,11 @@ extern "C" void initCL()
             LOGE("Can't init OpenCV with OpenCL TAPI");
         haveOpenCL = true;
     }
-    catch(cl::Error& e)
+    catch(const cl::Error& e)
     {
         LOGE("cl::Error: %s (%d)", e.what(), e.err());
     }
-    catch(std::exception& e)
+    catch(const std::exception& e)
     {
         LOGE("std::exception: %s", e.what());
     }
diff --git a/samples/cpp/detect_blob.cpp b/samples/cpp/detect_blob.cpp
index 3acb8fa1fb..25fbe56838 100644
--- a/samples/cpp/detect_blob.cpp
+++ b/samples/cpp/detect_blob.cpp
@@ -192,7 +192,7 @@ int main(int argc, char *argv[])
             imshow("Original", img);
             waitKey();
         }
-        catch (Exception& e)
+        catch (const Exception& e)
         {
             cout << "Feature : " << *itDesc << "\n";
             cout << e.msg << endl;
diff --git a/samples/cpp/detect_mser.cpp b/samples/cpp/detect_mser.cpp
index 8d62b2b7e4..9006efeef1 100644
--- a/samples/cpp/detect_mser.cpp
+++ b/samples/cpp/detect_mser.cpp
@@ -523,7 +523,7 @@ int main(int argc, char *argv[])
             imshow(winName, result);
             imshow("Original", img);
         }
-        catch (Exception& e)
+        catch (const Exception& e)
         {
             cout << "Feature: " << *itDesc << "\n";
             cout << e.msg << endl;
diff --git a/samples/cpp/live_detect_qrcode.cpp b/samples/cpp/live_detect_qrcode.cpp
index 6851e724a0..ceb8340ac1 100644
--- a/samples/cpp/live_detect_qrcode.cpp
+++ b/samples/cpp/live_detect_qrcode.cpp
@@ -175,7 +175,7 @@ int showImageQRCodeDetect(string in, string out)
         {
             imwrite(out, color_src, compression_params);
         }
-        catch (cv::Exception& ex)
+        catch (const cv::Exception& ex)
         {
             cout << "Exception converting image to PNG format: ";
             cout << ex.what() << '\n';
diff --git a/samples/cpp/matchmethod_orb_akaze_brisk.cpp b/samples/cpp/matchmethod_orb_akaze_brisk.cpp
index 7d39bae443..1eb0ded535 100644
--- a/samples/cpp/matchmethod_orb_akaze_brisk.cpp
+++ b/samples/cpp/matchmethod_orb_akaze_brisk.cpp
@@ -147,15 +147,15 @@ int main(int argc, char *argv[])
                     desMethCmp.push_back(cumSumDist2);
                     waitKey();
                 }
-                catch (Exception& e)
-                    {
+                catch (const Exception& e)
+                {
                     cout << e.msg << endl;
                     cout << "Cumulative distance cannot be computed." << endl;
                     desMethCmp.push_back(-1);
-                    }
                 }
+            }
         }
-        catch (Exception& e)
+        catch (const Exception& e)
         {
             cout << "Feature : " << *itDesc << "\n";
             if (itMatcher != typeAlgoMatch.end())
diff --git a/samples/cpp/pca.cpp b/samples/cpp/pca.cpp
index fb2f585af8..ba42700f18 100644
--- a/samples/cpp/pca.cpp
+++ b/samples/cpp/pca.cpp
@@ -141,7 +141,7 @@ int main(int argc, char** argv)
     // Read in the data. This can fail if not valid
     try {
         read_imgList(imgList, images);
-    } catch (cv::Exception& e) {
+    } catch (const cv::Exception& e) {
         cerr << "Error opening file \"" << imgList << "\". Reason: " << e.msg << endl;
         exit(1);
     }
diff --git a/samples/directx/d3d10_interop.cpp b/samples/directx/d3d10_interop.cpp
index 85d2607081..e8be8fac50 100644
--- a/samples/directx/d3d10_interop.cpp
+++ b/samples/directx/d3d10_interop.cpp
@@ -260,7 +260,7 @@ public:
             }
         } // try
 
-        catch (cv::Exception& e)
+        catch (const cv::Exception& e)
         {
             std::cerr << "Exception: " << e.what() << std::endl;
             return 10;
diff --git a/samples/directx/d3d11_interop.cpp b/samples/directx/d3d11_interop.cpp
index 42691c0a63..d00f7cffb8 100644
--- a/samples/directx/d3d11_interop.cpp
+++ b/samples/directx/d3d11_interop.cpp
@@ -378,7 +378,7 @@ public:
             }
         } // try
 
-        catch (cv::Exception& e)
+        catch (const cv::Exception& e)
         {
             std::cerr << "Exception: " << e.what() << std::endl;
             cleanup();
diff --git a/samples/directx/d3d9_interop.cpp b/samples/directx/d3d9_interop.cpp
index 31a1914cf1..4806a4078d 100644
--- a/samples/directx/d3d9_interop.cpp
+++ b/samples/directx/d3d9_interop.cpp
@@ -225,7 +225,7 @@ public:
             }
         }  // try
 
-        catch (cv::Exception& e)
+        catch (const cv::Exception& e)
         {
             std::cerr << "Exception: " << e.what() << std::endl;
             return 10;
diff --git a/samples/directx/d3d9ex_interop.cpp b/samples/directx/d3d9ex_interop.cpp
index ef03bd625a..24258e3702 100644
--- a/samples/directx/d3d9ex_interop.cpp
+++ b/samples/directx/d3d9ex_interop.cpp
@@ -226,7 +226,7 @@ public:
 
         } // try
 
-        catch (cv::Exception& e)
+        catch (const cv::Exception& e)
         {
             std::cerr << "Exception: " << e.what() << std::endl;
             return 10;
diff --git a/samples/directx/d3dsample.hpp b/samples/directx/d3dsample.hpp
index b082ff9c92..b78af8ef1b 100644
--- a/samples/directx/d3dsample.hpp
+++ b/samples/directx/d3dsample.hpp
@@ -158,7 +158,7 @@ int d3d_app(int argc, char** argv, std::string& title)
         return app.run();
     }
 
-    catch (cv::Exception& e)
+    catch (const cv::Exception& e)
     {
         std::cerr << "Exception: " << e.what() << std::endl;
         return 10;
diff --git a/samples/opencl/opencl-opencv-interop.cpp b/samples/opencl/opencl-opencv-interop.cpp
index d2961af777..816550feaf 100644
--- a/samples/opencl/opencl-opencv-interop.cpp
+++ b/samples/opencl/opencl-opencv-interop.cpp
@@ -676,7 +676,7 @@ int App::initVideoSource()
             throw std::runtime_error(std::string("specify video source"));
     }
 
-    catch (std::exception e)
+    catch (const std::exception e)
     {
         cerr << "ERROR: " << e.what() << std::endl;
         return -1;
diff --git a/samples/opengl/opengl_interop.cpp b/samples/opengl/opengl_interop.cpp
index d69f9e2476..7fbf4d6084 100644
--- a/samples/opengl/opengl_interop.cpp
+++ b/samples/opengl/opengl_interop.cpp
@@ -325,7 +325,7 @@ public:
         }
 
 
-        catch (cv::Exception& e)
+        catch (const cv::Exception& e)
         {
             std::cerr << "Exception: " << e.what() << std::endl;
             return 10;
@@ -520,7 +520,7 @@ int main(int argc, char** argv)
         app.create();
         return app.run();
     }
-    catch (cv::Exception& e)
+    catch (const cv::Exception& e)
     {
         cerr << "Exception: " << e.what() << endl;
         return 10;
diff --git a/samples/va_intel/va_intel_interop.cpp b/samples/va_intel/va_intel_interop.cpp
index 770e9dbf41..c4cf822f7a 100644
--- a/samples/va_intel/va_intel_interop.cpp
+++ b/samples/va_intel/va_intel_interop.cpp
@@ -256,7 +256,7 @@ int main(int argc, char** argv)
 
         std::cout << "Interop " << (doInterop ? "ON " : "OFF") << ": processing time, msec: " << time << std::endl;
     }
-    catch (std::exception& ex)
+    catch (const std::exception& ex)
     {
         std::cerr << "ERROR: " << ex.what() << std::endl;
     }