Create Exercises_9_4.cpp

Exercises_9_4.cpp

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+//Exercises_9_4.cpp Exercises at end of Chapter 9
+#include <opencv2/opencv.hpp>
+#include <iostream>
+
+using namespace cv;
+using namespace std;
+
+
+void help(const char **argv) {
+	cout << "\n\n"
+		<< "This program solves the Exercise 4、5 at the end of Chapter 9 \n"
+		<< "Call:\n"
+		<< argv[0] << " <path/image_name1>" << " <path/image_name2>\n\n"
+		<< "For example: ./" << argv[0] << " ../left.jpg "<< " ../left.jpg\n"
+		<< endl;
+}
+
+int main( int argc, const char** argv )
+{
+	help(argv);
+	if(argc < 3) {
+		cout << "\nERROR: You had too few parameters.\n" << endl;
+		return -1;
+	}
+	Mat temp;
+
+	/************************************************************************/
+	/* 4.  Use a camera to take two pictures of the same scene while moving the camera as
+	little as possible. Load these images into the computer as src1 and src1.
+	a.  Take  the  absolute  value  of  src1  minus  src1  (subtract  the  images);  call  it
+	diff12 and display. If this were done perfectly, diff12 would be black. Why
+	isn’t it?
+	b.  Create cleandiff by using cv::erode() and then cv::dilate() on diff12.
+	Display the results.
+	c.  Create  dirtydiff  by  using  cv::dilate()  and  then  cv::erode()  on  diff12
+	and then display.
+	d.  Explain the difference between cleandiff and dirtydiff.                                                                     */
+	/************************************************************************/
+	Mat src1 = imread(argv[1],IMREAD_GRAYSCALE);
+	Mat src2 = imread(argv[2],IMREAD_GRAYSCALE);
+	if (src1.empty() || src2.empty())
+	{
+		cout << "\nERROR: parameters is not a image name.\n" << endl;
+		return -1;
+	}
+	//a
+	Mat diff12 =  src1 - src2;
+	imshow("diff12",diff12);
+	//b
+	Mat cleandiff;
+	erode(diff12,cleandiff,Mat());
+	dilate(cleandiff,cleandiff,Mat());
+	imshow("cleandiff",cleandiff);
+	//c
+	Mat dirtydiff;
+	dilate(diff12,dirtydiff,Mat());
+	erode(dirtydiff,dirtydiff,Mat());
+	imshow("dirtydiff",dirtydiff);
+	//d
+	absdiff(cleandiff,dirtydiff,temp) ;
+	imshow("absdiff",temp);
+	//the difference between cleandiff and dirtydiff is the difference between of "open" and "close"
+	waitKey();
+	return 0;
+
+}