fix the bug when src*2 < dst

modules/imgproc/src/pyramids.cpp

@@ -983,6 +983,8 @@ pyrUp_( const Mat& _src, Mat& _dst, int)
         row0 = rows[0]; row1 = rows[1]; row2 = rows[2];
         dsts[0] = dst0; dsts[1] = dst1;
 
+        if (dst0 != dst1)
+        {
             x = PyrUpVecV<WT, T>(rows, dsts, dsize.width);
             for( ; x < dsize.width; x++ )
             {
@@ -991,6 +993,16 @@ pyrUp_( const Mat& _src, Mat& _dst, int)
                 dst1[x] = t1; dst0[x] = t0;
             }
         }
+        else
+        {
+            for(x = 0; x < dsize.width; x++ )
+            {
+                T t0 = castOp(row0[x] + row1[x]*6 + row2[x]);
+                dst0[x] = t0;
+            }
+        }
+        
+    }
 
     if (dsize.height > ssize.height*2)
     {

modules/imgproc/test/test_pyramid.cpp

@@ -8,12 +8,41 @@ namespace opencv_test { namespace {
 
 TEST(Imgproc_PyrUp, pyrUp_regression_22184)
 {
-    Mat src(100, 100, CV_16UC3, Scalar::all(255));
+    Mat src(100,100,CV_16UC3,Scalar(255,255,255));
-    Mat dst(100 * 2 + 1, 100 * 2 + 1, CV_16UC3, Scalar::all(0));
+    Mat dst(100 * 2 + 1, 100 * 2 + 1, CV_16UC3, Scalar(0,0,0));
     pyrUp(src, dst, Size(dst.cols, dst.rows));
-    double min_val = 0;
+    double min_val;
     minMaxLoc(dst, &min_val);
     ASSERT_GT(cvRound(min_val), 0);
 }
 
-}}  // namespace
+TEST(Imgproc_PyrUp, pyrUp_regression_22193)
+{
+    Mat src(13, 13,CV_16UC3,Scalar(0,0,0));
+    {
+        int swidth = src.cols;
+        int sheight = src.rows;
+        int cn = src.channels();
+        int count = 0;
+        for (int y = 0; y < sheight; y++)
+        {
+            ushort *src_c = src.ptr<ushort>(y);
+            for (int x = 0; x < swidth * cn; x++)
+            {
+                src_c[x] = (count++) % 10;
+            }
+        }
+    }
+    Mat dst(src.cols * 2 - 1, src.rows * 2 - 1, CV_16UC3, Scalar(0,0,0));
+    pyrUp(src, dst, Size(dst.cols, dst.rows));
+
+    {
+        ushort *dst_c = dst.ptr<ushort>(dst.rows - 1);
+        ASSERT_EQ(dst_c[0], 6);
+        ASSERT_EQ(dst_c[1], 6);
+        ASSERT_EQ(dst_c[2], 1);
+    }
+}
+
+}
+}