From 6f87567ee170d0aebb22f721f4504cc5943b8527 Mon Sep 17 00:00:00 2001
From: Anatoly Baksheev <no@email>
Date: Mon, 17 Jan 2011 10:56:02 +0000
Subject: [PATCH] gpu morphology sample

---
 samples/gpu/morfology.cpp | 107 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 samples/gpu/morfology.cpp

diff --git a/samples/gpu/morfology.cpp b/samples/gpu/morfology.cpp
new file mode 100644
index 0000000..702125b
--- /dev/null
+++ b/samples/gpu/morfology.cpp
@@ -0,0 +1,107 @@
+
+#include <opencv2/imgproc/imgproc.hpp>
+#include <opencv2/highgui/highgui.hpp>
+#include <opencv2/gpu/gpu.hpp>
+#include <stdlib.h>
+#include <stdio.h>
+
+using namespace cv;
+using namespace cv::gpu;
+
+void help()
+{
+
+printf("\nShow off image morphology: erosion, dialation, open and close\n"
+	"Call:\n   morphology2 [image]\n"
+	"This program also shows use of rect, elipse and cross kernels\n\n");
+printf( "Hot keys: \n"
+    "\tESC - quit the program\n"
+    "\tr - use rectangle structuring element\n"
+    "\te - use elliptic structuring element\n"
+    "\tc - use cross-shaped structuring element\n"
+    "\tSPACE - loop through all the options\n" );
+}
+
+GpuMat src, dst;
+
+int element_shape = MORPH_RECT;
+
+//the address of variable which receives trackbar position update
+int max_iters = 10;
+int open_close_pos = 0;
+int erode_dilate_pos = 0;
+
+// callback function for open/close trackbar
+void OpenClose(int, void*)
+{
+    int n = open_close_pos - max_iters;
+    int an = n > 0 ? n : -n;
+    Mat element = getStructuringElement(element_shape, Size(an*2+1, an*2+1), Point(an, an) );
+    if( n < 0 )
+		cv::gpu::morphologyEx(src, dst, CV_MOP_OPEN, element);
+    else
+        cv::gpu::morphologyEx(src, dst, CV_MOP_CLOSE, element);
+    imshow("Open/Close",dst);
+}
+
+// callback function for erode/dilate trackbar
+void ErodeDilate(int, void*)
+{
+    int n = erode_dilate_pos - max_iters;
+    int an = n > 0 ? n : -n;
+    Mat element = getStructuringElement(element_shape, Size(an*2+1, an*2+1), Point(an, an) );
+    if( n < 0 )
+        cv::gpu::erode(src, dst, element);
+    else
+        cv::gpu::dilate(src, dst, element);
+    imshow("Erode/Dilate",dst);
+}
+
+
+int main( int argc, char** argv )
+{
+    char* filename = argc == 2 ? argv[1] : (char*)"baboon.jpg";
+    if( (src = imread(filename,1)).data == 0 )
+        return help(), -1;
+
+    help();
+
+	
+	if (src.channels() == 3)
+	{
+		// gpu support only 4th channel images
+		GpuMat src4ch;
+		cv::gpu::cvtColor(src, src4ch, CV_BGR2BGRA); 
+		src = src4ch;
+	}
+
+    //create windows for output images
+    namedWindow("Open/Close",1);
+    namedWindow("Erode/Dilate",1);
+
+    open_close_pos = erode_dilate_pos = max_iters;
+    createTrackbar("iterations", "Open/Close",&open_close_pos,max_iters*2+1,OpenClose);
+    createTrackbar("iterations", "Erode/Dilate",&erode_dilate_pos,max_iters*2+1,ErodeDilate);
+
+    for(;;)
+    {
+        int c;
+
+        OpenClose(open_close_pos, 0);
+        ErodeDilate(erode_dilate_pos, 0);
+        c = cvWaitKey(0);
+
+        if( (char)c == 27 )
+            break;
+        if( (char)c == 'e' )
+            element_shape = MORPH_ELLIPSE;
+        else if( (char)c == 'r' )
+            element_shape = MORPH_RECT;
+        else if( (char)c == 'c' )
+            element_shape = MORPH_CROSS;
+        else if( (char)c == ' ' )
+            element_shape = (element_shape + 1) % 3;
+    }
+
+    return 0;
+}
-- 
2.7.4