Merge pull request #9997 An error occurred from ElenaGvozdeva:GaussianBlur_bug

modules/core/include/opencv2/core/mat.inl.hpp

@@ -508,7 +508,6 @@ Mat::Mat(int _rows, int _cols, int _type, void* _data, size_t _step)
     }
     else
     {
-        if( rows == 1 ) _step = minstep;
         CV_DbgAssert( _step >= minstep );
 
         if (_step % esz1 != 0)
@@ -516,7 +515,8 @@ Mat::Mat(int _rows, int _cols, int _type, void* _data, size_t _step)
             CV_Error(Error::BadStep, "Step must be a multiple of esz1");
         }
 
-        flags |= _step == minstep ? CONTINUOUS_FLAG : 0;
+        if (_step == minstep || rows == 1)
+            flags |= CONTINUOUS_FLAG;
     }
     step[0] = _step;
     step[1] = esz;
@@ -541,7 +541,6 @@ Mat::Mat(Size _sz, int _type, void* _data, size_t _step)
     }
     else
     {
-        if( rows == 1 ) _step = minstep;
         CV_DbgAssert( _step >= minstep );
 
         if (_step % esz1 != 0)
@@ -549,7 +548,8 @@ Mat::Mat(Size _sz, int _type, void* _data, size_t _step)
             CV_Error(Error::BadStep, "Step must be a multiple of esz1");
         }
 
-        flags |= _step == minstep ? CONTINUOUS_FLAG : 0;
+        if (_step == minstep || rows == 1)
+            flags |= CONTINUOUS_FLAG;
     }
     step[0] = _step;
     step[1] = esz;

modules/imgproc/test/test_filter.cpp

@@ -1982,6 +1982,27 @@ TEST(Imgproc_Blur, borderTypes)
     EXPECT_DOUBLE_EQ(0.0, cvtest::norm(expected_dst, dst, NORM_INF));
 }
 
+TEST(Imgproc_GaussianBlur, borderTypes)
+{
+    Size kernelSize(3, 3);
+
+    Mat src_16(16, 16, CV_8UC1, cv::Scalar::all(42)), dst_16;
+    Mat src_roi_16 = src_16(Rect(1, 1, 14, 14));
+    src_roi_16.setTo(cv::Scalar::all(3));
+
+    cv::GaussianBlur(src_roi_16, dst_16, kernelSize, 0, 0, BORDER_REPLICATE);
+
+    EXPECT_EQ(20, dst_16.at<uchar>(0, 0));
+
+    Mat src(3, 12, CV_8UC1, cv::Scalar::all(42)), dst;
+    Mat src_roi = src(Rect(1, 1, 10, 1));
+    src_roi.setTo(cv::Scalar::all(2));
+
+    cv::GaussianBlur(src_roi, dst, kernelSize, 0, 0, BORDER_REPLICATE);
+
+    EXPECT_EQ(27, dst.at<uchar>(0, 0));
+}
+
 TEST(Imgproc_Morphology, iterated)
 {
     RNG& rng = theRNG();