From 488143a3bcb15df12079bb820772afedde436650 Mon Sep 17 00:00:00 2001
From: Callum <callum@callum-ubuntu.(none)>
Date: Sun, 20 Oct 2013 18:14:41 +0800
Subject: [PATCH] added canny edge

---
 server/dilatometer.c | 83 ++++++++++++++++++++++++++++++++++----------
 1 file changed, 64 insertions(+), 19 deletions(-)

diff --git a/server/dilatometer.c b/server/dilatometer.c
index 34fc89c..5cfca0a 100644
--- a/server/dilatometer.c
+++ b/server/dilatometer.c
@@ -11,8 +11,18 @@
 // test positions
 static double test_left, test_right;
 
+// Canny Edge algorithm variables
+int edgeThresh = 1;
+int lowThreshold;
+int const max_lowThreshold = 100;
+int ratio = 3;
+int kernel_size = 3;
+
 /** Buffer for storing image data. Stored as a  **/
-static CvMat * g_data = NULL;
+static CvMat * g_srcRGB  = NULL; // Source Image
+static CvMat * g_srcGray = NULL; // Gray scale of source image
+static CvMat * g_edges 	 = NULL; // Detected Edges
+static CvMat * g_data    = NULL; // Image to mask edges onto
 
 
 /** Camera capture pointer **/
@@ -24,8 +34,7 @@ static CvCapture * g_capture = NULL;
 void Dilatometer_TestImage()
 {
 	
-	CvMat *g_dataRGB;
-	g_dataRGB = cvCreateMat(480, 640, CV_8UC3);
+	g_srcRGB = cvCreateMat(480, 640, CV_8UC3);
 
 	for( int x = 0; x < 640; ++x)
 	{
@@ -46,7 +55,7 @@ void Dilatometer_TestImage()
 				else
  					s.val[i] *= exp( (test_right - x) / 25); 				
 			}	
-			cvSet2D(g_dataRGB,y,x,s);
+			cvSet2D(g_srcRGB,y,x,s);
 		//	if( s.val[0] > 200)
 		//		printf("row: %d, col: %d, %f\n", y, x, s.val[0]); 
 		}
@@ -54,9 +63,9 @@ void Dilatometer_TestImage()
 	}
 	if (g_data == NULL)
 	{
-		g_data = cvCreateMat(g_dataRGB->rows,g_dataRGB->cols,CV_8UC1); //IPL_DEPTH_8U?
+		g_data = cvCreateMat(g_srcRGB->rows,g_srcRGB->cols,CV_8UC1); //IPL_DEPTH_8U?
 	}
-	cvCvtColor(g_dataRGB,g_data,CV_RGB2GRAY);
+	cvCvtColor(g_srcRGB,g_data,CV_RGB2GRAY);
 }	
 
 /**
@@ -90,11 +99,47 @@ static void Dilatometer_GetImage()
 	//Need to implement camera
 }
 
+void CannyThreshold()
+{
+	
+	if (g_data == NULL)
+	{
+		g_data = cvCreateMat(g_srcGray->rows,g_srcGray->cols,CV_8UC1);
+	}
+
+	if ( g_edges == NULL)
+	{
+		g_edges = cvCreateMat(g_srcGray->rows,g_srcGray->cols,CV_8UC1);
+	}
+ 	
+	//g_data = 0;
+	cvShowImage("display", g_srcGray);
+	cvWaitKey(0); 	
+	// Reduce noise with a kernel 3x3. Input the grayscale source image, output to edges. (0's mean it's determined from kernel sizes)
+	cvSmooth( g_srcGray, g_edges, CV_GAUSSIAN, 9, 9 ,0 ,0 );
+	
+	cvShowImage("display", g_edges);
+	cvWaitKey(0); 	
+
+	// Find the edges in the image
+	cvCanny( g_edges, g_edges, lowThreshold, lowThreshold*ratio, kernel_size );
+
+	cvShowImage("display", g_edges);
+	cvWaitKey(0); 	
+	
+	// Mask the edges over G_data
+	//.copyTo( g_data, g_edges);
+}
+
 // Test algorithm
 static void Dilatometer_GetImageTest( )
 {	
-	//Test image
-	Dilatometer_TestImage();
+	//Generates Test image
+	//Dilatometer_TestImage();
+	
+	//Load Test image
+	g_srcGray = cvLoadImageM ("testimage.jpg",CV_LOAD_IMAGE_GRAYSCALE );
+	CannyThreshold();
 }
 
 
@@ -104,14 +149,14 @@ static void Dilatometer_GetImageTest( )
  * @returns the average width of the can
  */
 double Dilatometer_Read(int samples)
-{
+{ 	
 	//Get the latest image
 	//Dilatometer_GetImage();
 
 	Dilatometer_GetImageTest();
 	
-	int width = g_data->cols;
-	int height = g_data->rows;
+	int width = g_srcGray->cols;
+	int height = g_srcGray->rows;
 	// If the number of samples is greater than the image height, sample every row
 	if( samples > height)
 	{
@@ -135,13 +180,13 @@ double Dilatometer_Read(int samples)
 		sample_height = ceil(height * (i + 1) / samples) -1;
 		//printf("sample height is %d\n", sample_height);
 
-		//CvScalar test = cvGet2D(g_data, 150,300);
+		//CvScalar test = cvGet2D(g_srcGray, 150,300);
 		//printf("test is %f,%f,%f,%f\n", test.val[0], test.val[1], test.val[2], test.val[3]);
 
 
 		for ( int col = 0; col < width; col++)
 		{
-			CvScalar value = cvGet2D(g_data, sample_height, col);
+			CvScalar value = cvGet2D(g_srcGray, sample_height, col);
 			if( value.val[0]> THRES)
 			{
 				edges[pos] += (double) col;
@@ -180,11 +225,11 @@ int main(int argc, char ** argv)
 	test_right = 500;
 	Dilatometer_Init();
 
-	cvNamedWindow( "display", CV_WINDOW_AUTOSIZE);
-	cvShowImage("display", g_data);
-	cvWaitKey(0); 	
+//	cvNamedWindow( "display", CV_WINDOW_AUTOSIZE);
+//	cvShowImage("display", g_data);
+//	cvWaitKey(0); 	
 	double width;
-	for( int i = 0; i < 20; ++i)
+	/*for( int i = 0; i < 20; ++i)
 	{
 		test_left  -= i * (rand() % 1000) * 1e-3;
 		test_right += i * (rand() % 1000) * 1e-3;
@@ -203,11 +248,11 @@ int main(int argc, char ** argv)
 
 		width = Dilatometer_Read(5);
 		cvNamedWindow( "display", CV_WINDOW_AUTOSIZE);
-		cvShowImage("display", g_data);
+		cvShowImage("display", g_srcGray);
 		cvWaitKey(0); 
 		double expected = test_right - test_left;
 		double perc = 100 * (expected - width) / expected;
 		printf("%d: Left: %.4f.    Width: %.4f.\n  Right: %.4f. Expected: %.4f. Percentage: %.4f\n", i, test_left, width, test_right, expected, perc);
-	}
+	}*/
 }
 
-- 
2.20.1