Hit and Miss morphological op

modules/imgproc/doc/filtering.rst

@@ -1231,6 +1231,8 @@ Performs advanced morphological transformations.
 
             * **MORPH_BLACKHAT** - "black hat"
 
+            * **MORPH_HITMISS** - "hit and miss"
+
     :param iterations: Number of times erosion and dilation are applied.
 
     :param borderType: Pixel extrapolation method. See  :ocv:func:`borderInterpolate` for details.
@@ -1269,6 +1271,8 @@ Morphological gradient:
 
     \texttt{dst} = \mathrm{blackhat} ( \texttt{src} , \texttt{element} )= \mathrm{close} ( \texttt{src} , \texttt{element} )- \texttt{src}
 
+"Hit and Miss": Only supported for CV_8UC1 binary images. Tutorial can be found in this page: http://opencv-code.com/tutorials/hit-or-miss-transform-in-opencv/
+
 Any of the operations can be done in-place. In case of multi-channel images, each channel is processed independently.
 
 .. seealso::

modules/imgproc/include/opencv2/imgproc/imgproc.hpp

@@ -352,7 +352,7 @@ CV_EXPORTS_W Mat getGaborKernel( Size ksize, double sigma, double theta, double
 enum { MORPH_ERODE=CV_MOP_ERODE, MORPH_DILATE=CV_MOP_DILATE,
        MORPH_OPEN=CV_MOP_OPEN, MORPH_CLOSE=CV_MOP_CLOSE,
        MORPH_GRADIENT=CV_MOP_GRADIENT, MORPH_TOPHAT=CV_MOP_TOPHAT,
-       MORPH_BLACKHAT=CV_MOP_BLACKHAT };
+       MORPH_BLACKHAT=CV_MOP_BLACKHAT, MORPH_HITMISS };
 
 //! returns horizontal 1D morphological filter
 CV_EXPORTS Ptr<BaseRowFilter> getMorphologyRowFilter(int op, int type, int ksize, int anchor=-1);

modules/imgproc/src/morph.cpp

@@ -1374,6 +1374,8 @@ void cv::morphologyEx( InputArray _src, OutputArray _dst, int op,
     _dst.create(src.size(), src.type());
     Mat dst = _dst.getMat();
 
+    Mat k1, k2, e1, e2;        //only for hit and miss op
+
     switch( op )
     {
     case MORPH_ERODE:
@@ -1409,6 +1411,24 @@ void cv::morphologyEx( InputArray _src, OutputArray _dst, int op,
         erode( temp, temp, kernel, anchor, iterations, borderType, borderValue );
         dst = temp - src;
         break;
+    case MORPH_HITMISS:
+        CV_Assert(src.type() == CV_8UC1);
+        k1 = (kernel.getMat() == 1);
+        k2 = (kernel.getMat() == -1);
+        if (countNonZero(k1) <= 0)
+            e1 = src;
+        else
+            erode(src, e1, k1, anchor, iterations, borderType, borderValue);
+        if (countNonZero(k2) <= 0)
+            e2 = src;
+        else
+        {
+            Mat src_complement;
+            bitwise_not(src, src_complement);
+            erode(src_complement, e2, k2, anchor, iterations, borderType, borderValue);
+        }
+        dst = e1 & e2;
+        break;
     default:
         CV_Error( CV_StsBadArg, "unknown morphological operation" );
     }