X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=server%2Fdilatometer.c;h=83cdc4c9a73117539582cd408ee0bcf4f30d9619;hb=161a41e5fae2e8f2d575dbd26417c0719abe9b1f;hp=6610cac9ccf9f3026a3ef5243068df41fd4d4f4c;hpb=c959db1c5f17fb1555b0f67e90bdbcc5ccfe6af0;p=matches%2FMCTX3420.git

diff --git a/server/dilatometer.c b/server/dilatometer.c
index 6610cac..83cdc4c 100644
--- a/server/dilatometer.c
+++ b/server/dilatometer.c
@@ -8,106 +8,283 @@
 #include "dilatometer.h"
 #include <math.h>
 
-/** Buffer for storing image data. Stored as a  **/
-static CvMat * g_data = NULL;
+// test positions
+static double test_left, test_right;
 
+// Canny Edge algorithm variables
+int blur = 5;
+int lowThreshold = 30;
+int ratio = 3;
+int kernel_size = 3;
 
-/** Camera capture pointer **/
+/** Buffers for storing image data.  **/
+static CvMat * g_srcRGB  = NULL; 	// Source Image
+static CvMat * g_srcGray = NULL; 	// Gray scale of source image
+static CvMat * g_edges 	 = NULL; 	// Detected Edges
+
+/** Pointers for capturing image **/
 static CvCapture * g_capture = NULL;
+static IplImage * frame  = NULL;	// This is required as you can not use capture with CvMat in C
 
 
 /**
- * Initialise the dilatometer
+ * Create a test image using left as left edge and right as right edge positions
  */
-void Dilatometer_Init()
+void Dilatometer_TestImage()
 {
 	
-	// Make an initial reading (will allocate memory the first time only).
-	Dilatometer_Read(1); 
-}
+	g_srcRGB = cvCreateMat(480, 640, CV_8UC3);
+
+	for( int x = 0; x < 640; ++x)
+	{
+		for (int y = 0; y < 480; ++y)
+		{
+			CvScalar s; 
+			for( int i = 0; i < 3; ++i)
+			{
+				s.val[i]  =  210 + (rand() % 1000) * 1e-0 - (rand() % 1000) * 1e-0;
+				// Produce an exponential decay around left edge
+				if( x < test_left)
+					s.val[i] *= exp( (x - test_left) / 25);
+				else if( x < 320)
+					s.val[i] *= exp( (test_left - x) / 25); 
+				// Produce an exponential decay around right edge
+				else if( x < test_right)
+					s.val[i] *= exp( (x - test_right) / 25); 
+				else
+ 					s.val[i] *= exp( (test_right - x) / 25); 				
+			}	
+			cvSet2D(g_srcRGB,y,x,s);
+		}
+		
+	}
+	if (g_srcGray == NULL)
+	{
+		g_srcGray = cvCreateMat(g_srcRGB->rows,g_srcRGB->cols,CV_8UC1);
+	}
+	cvCvtColor(g_srcRGB,g_srcGray,CV_RGB2GRAY);
+}	
 
 /**
- * Cleanup Interferometer stuff
+ * Cleanup Dilatometer pointers
  */
 void Dilatometer_Cleanup()
 {
-	if (g_data != NULL)
-		cvReleaseMat(&g_data);
-
 	if (g_capture != NULL)
 		cvReleaseCapture(&g_capture);
-
+	if (frame != NULL)
+		cvReleaseImageHeader(&frame);
+	//if (g_srcRGB != NULL)
+	//	cvReleaseMat(&g_srcRGB);	// Causing run time error in cvReleaseMat
+	if (g_srcGray != NULL)
+		cvReleaseMat(&g_srcGray);
+	if (g_edges != NULL)
+		cvReleaseMat(&g_edges);
 }
 
 /**
  * Get an image from the Dilatometer
  */
-static void Dilatometer_GetImage()
+static bool Dilatometer_GetImage()
+{	
+	bool result = true;
+	// If more than one camera is connected, then input needs to be determined, however the camera ID may change after being unplugged
+	if( g_capture == NULL)
+	{
+		g_capture = cvCreateCameraCapture(0);
+		//If cvCreateCameraCapture returns NULL there is an error with the camera
+		if( g_capture == NULL)
+		{
+			result = false;
+			return;
+		}
+	}
+
+	// Get the frame and convert it to CvMat
+	frame =  cvQueryFrame(g_capture);
+	CvMat stub;
+	g_srcRGB = cvGetMat(frame,&stub,0,0);
+
+	if( g_srcRGB == NULL)
+		result = false;
+	
+	// Convert the image to grayscale
+	if (g_srcGray == NULL)
+	{
+		g_srcGray = cvCreateMat(g_srcRGB->rows,g_srcRGB->cols,CV_8UC1);
+	}
+
+	cvCvtColor(g_srcRGB,g_srcGray,CV_RGB2GRAY);
+	
+	return result;
+}
+
+void CannyThreshold()
 {
-	//Need to supply test image
+	if ( g_edges == NULL)
+	{
+		g_edges = cvCreateMat(g_srcGray->rows,g_srcGray->cols,CV_8UC1);
+	}
+ 	
+	// Commented out lines are used during testing to show the image to screen, can also save the test images
+	//cvShowImage("display", g_srcGray);
+	//cvWaitKey(0); 	
+	
+	// Reduce noise with a kernel blurxblur. Input the grayscale source image, output to edges. (0's mean it's determined from kernel sizes)
+	cvSmooth( g_srcGray, g_edges, CV_GAUSSIAN, blur, blur ,0 ,0 );
+	
+	//Save the image
+	//cvSaveImage("test_blurred.jpg",g_edges,0);
+
+	//cvShowImage("display", g_edges);
+	//cvWaitKey(0); 
+
+	// Find the edges in the image
+	cvCanny( g_edges, g_edges, lowThreshold, lowThreshold*ratio, kernel_size );
+	
+	//Save the image
+	//cvSaveImage("test_edge.jpg",g_edges,0);
+
+	//cvShowImage("display", g_edges);
+	//cvWaitKey(0); 	
 
-	//Need to implement camera
 }
-/**
- * Read the dilatometer; gets the latest image, processes it, THEN DOES WHAT
+
+ /**
+ * Read the dilatometer image. The value changed will correspond to the new location of the edge.
+ * @param val - Will store the read value if successful
  * @param samples - Number of rows to scan (increasing will slow down performance!)
- * @returns the average width of the can
+ * @returns true on successful read
  */
-double Dilatometer_Read(int samples)
+bool Dilatometer_GetEdge( double * value, int samples)
 {
-	//Get the latest image
-	Dilatometer_GetImage();
+	bool result = false; 
+	double average = 0;
+	// Get the image from the camera
+	result = Dilatometer_GetImage();
+	// If an error occured when capturing image then return
+	if (!result)
+		return result;
+	
+	// Apply the Canny Edge theorem to the image
+	CannyThreshold();
 
-	int width = g_data->cols;
-	int height = g_data->rows;
+	int width = g_edges->cols;
+	int height = g_edges->rows;
+	
 	// If the number of samples is greater than the image height, sample every row
 	if( samples > height)
 	{
-		Log(LOGNOTE, "Number of samples is greater than the dilatometer image height, sampling every row instead.\n");
 		samples = height;
 	}
-
-	// Stores the width of the can at different sample locations. Not necessary unless we want to store this information
-	//double widths[samples];
-	// The average width of the can
-	double average_width;
+	
 	int sample_height;
+	int num_edges = 0;	// Number of edges. if each sample location has an edge, then num_edges = samples
+
 	for (int i=0; i<samples; i++)
 	{
-		// Contains the locations of the 2 edges
-		double edges[2] = {0};
-		int pos = 0;	// Position in the edges array (start at left edge)
-		int num = 0;	// Keep track of the number of columns above threshold
-
 		// Determine the position in the rows to find the edges. 
+		// This will give you a number of evenly spaced samples
 		sample_height = ceil(height * (i + 1) / samples) -1;
 		
+		// Need to go through each pixel of a row and find all the locations of a line. If there is more than one pixel, average it. note this only works if the canny edge algorithm returns lines about the actual line (no outliers).
+		
+		int edge_location=0;
+		int num=0;
 		for ( int col = 0; col < width; col++)
 		{
-			if ( CV_MAT_ELEM( *g_data, double, col, sample_height) > THRES)
+			// Count the number of points
+			// Get the threshold of the pixel at the current location
+			CvScalar value = cvGet2D(g_edges, sample_height, col);
+			if( value.val[0]> THRES)
 			{
-				edges[pos] += col;
+				edge_location += col;
 				num++;
 			}
-			// If num > 0 and we're not above threshold, we have left the threshold of the edge
-			else if( num > 0);
-			{
-				// Find the mid point of the edge
-				edges[pos] /= num;
-				if( edges[1] == 0) 
-				{
-					pos = 1;	// Move to the right edge
-					num = 0;
-				}
-				else
-					break;		// Exit the for loop
-			}
 		}
-		// Determine the width of the can at this row
-		//widths[i] = edges[1] - edges[0];
-		average_width += (edges[1] - edges[0]);
+		if( num > 0)
+		{
+			average += ( edge_location / num );
+			num_edges++;
+		}
 	}
-		average_width /= samples;
-		return average_width;
+	if (num_edges > 0)
+		average /= num_edges;
+	
+	if( average > 0)
+	{	
+		result = true; //Successfully found an edge
+		*value = average;
+	}
+	return result;
+}
+
+ /**
+ * Read the dilatometer image. The value changed will correspond to the new location of the edge.
+ * @param val - Will store the read value if successful
+ * @returns true on successful read
+ */
+bool Dilatometer_Read( double * value)
+{
+	bool result = Dilatometer_GetEdge(value, SAMPLES);
+	return result;
+}
+
+/**
+ * Initialise the dilatometer
+ */
+void Dilatometer_Init()
+{
+	// Make an initial reading (will allocate memory the first time only).
+	double val;
+	Dilatometer_GetEdge(&val, 1); 
+}
+
+// Overlays a line over the given edge position
+void Draw_Edge(double edge)
+{
+	CvScalar value;
+	value.val[0]=244;
+	for( int i = 0; i < g_srcGray->rows; i++)
+	{
+		cvSet2D(g_edges,i,edge,value);
+	}
+	cvShowImage("display", g_edges);
+	cvWaitKey(0); 	
+	//cvSaveImage("test_edge_avg.jpg",g_edges,0);
+}
+
+/* // Test algorithm
+static void Dilatometer_GetImageTest( )
+{	
+	//Generates Test image
+	//Dilatometer_TestImage();
+	
+	//Load Test image
+	g_srcGray = cvLoadImageM ("testimage4.jpg",CV_LOAD_IMAGE_GRAYSCALE );
+}*/
+
+/**
+ * For testing purposes
+ */
+int main(int argc, char ** argv)
+{
+	//cvNamedWindow( "display", CV_WINDOW_AUTOSIZE );// Create a window for display.
+	//gettimeofday(&start, NULL);
+	test_left = 100;
+	test_right = 500;
+	Dilatometer_Init();
+	
+	cvNamedWindow( "display", CV_WINDOW_AUTOSIZE);
+	//double width;
+	
+	double edge;
+	Dilatometer_GetEdge(&edge,20000);
+	//For testing purposes, overlay the given average line over the image
+	//Draw_Edge(edge);
+	
+	cvDestroyWindow("display");
+
+	Dilatometer_Cleanup();
 }