contours

contour_detection.cpp

@@ -0,0 +1,48 @@
+#include <iostream> 
+#include <opencv2/opencv.hpp> 
+#include <opencv2/highgui/highgui.hpp> 
+ 
+ 
+int main() 
+{ 
+	cv::VideoCapture camera(0); 
+ 
+	if (!camera.isOpened()) 
+	{ 
+  		std::cerr << "[ERROR] Could not open the camera!" << std::endl; 
+  		return 1; 
+	} 
+ 
+	cv::namedWindow("Webcam", cv::WINDOW_AUTOSIZE); 
+ 
+ 
+	while(true) 
+	{ 
+		cv::Mat frame;
+		camera >> frame; 
+		cv::imshow("Webcam", frame);//normal
+		//----------	grey
+		cv::Mat frame_gray;
+		cv::cvtColor(frame,frame_gray,cv::COLOR_BGR2GRAY);
+		//cv::imshow("gray",frame_gray);//grey
+ 		//----------- treshold
+ 		cv::Mat frame_thresh; 
+		threshold(frame_gray, frame_thresh, 150, 255, cv::THRESH_BINARY); 
+		//cv::imshow("thresh", frame_thresh); 
+		//----------- contour
+		std::vector<std::vector<cv::Point>> contours; 
+		std::vector<cv::Vec4i> hierarchy; 
+		findContours(frame_thresh, contours, hierarchy, cv::RETR_TREE, cv::CHAIN_APPROX_NONE); 
+ 
+		cv::Mat frame_contours = frame.clone(); 
+		drawContours(frame_contours, contours, -1, cv::Scalar(0, 255, 0), 2); 
+ 
+cv::imshow("contours", frame_contours);
+
+ 
+  		if (cv::waitKey(30) >= 0) 
+   			break; 
+	} 
+ 
+ 	return 0; 
+}

makefile

@@ -1,6 +1,8 @@
-all: main arithmetic hello
+all: main arithmetic hello contour
 	g++ main.o arithmetic.o -L/usr/lib/x86_64-linux-gnu -lopencv_core 
-
+	
+	g++ contour_detection.o -o contour -L/usr/lib/x86_64-linux-gnu -lopencv_core -lopencv_highgui -lopencv_imgproc -lopencv_videoio -lopencv_imgcodecs
+	
 main: main.cpp
 	g++ -c main.cpp -I/usr/include/opencv4
 	
@@ -10,6 +12,9 @@ arithmetic: arithmetic.cpp arithmetic.h
 hello: hello_world.cpp
 	g++ -c hello_world.cpp -I/usr/include/opencv4
 
+contour: contour_detection.cpp
+	g++ -c contour_detection.cpp -I/usr/include/opencv4
+
 clean:
 	rm *.o
 	rm a.out