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Homework/perspective/main.cpp

@@ -1,11 +1,49 @@
 #include <iostream>
-#include <array>
-#include <cstdint>
-#include <cmath>
 #include "opencv2/opencv.hpp"
 
 using namespace std;
 using namespace cv;
 
+Mat src;
+Point2f srcQuad[4], dstQuad[4];
+
+void on_mouse(int event, int x, int y, int flags, void* userdata);
+
 int main() {
+	Mat src = imread("../../resources/images/card.bmp");
+
+	namedWindow("src");
+	setMouseCallback("src", on_mouse);
+
+	imshow("src", src);
+	waitKey(0);
+
+	return 0;
+}
+
+void on_mouse(int event, int x, int y, int flags, void* userdata) {
+	static int cnt = 0;
+
+	if (event == EVENT_LBUTTONDOWN) {
+		srcQuad[cnt++ % 4] = Point2f(x, y);
+
+		circle(src, Point(x, y), 5, Scalar(0, 0, 255), -1);
+		imshow("src", src);
+
+		if (cnt % 4 == 0) {
+			int w = 200, h = 300;
+
+			dstQuad[0] = Point2f(0, 0);
+			dstQuad[1] = Point2f(w - 1, 0);
+			dstQuad[2] = Point2f(w - 1, h - 1);
+			dstQuad[3] = Point2f(0, h - 1);
+
+			Mat pers = getPerspectiveTransform(srcQuad, dstQuad);
+
+			Mat dst;
+			warpPerspective(src, dst, pers, Size(w, h));
+
+			imshow("dst", dst);
+		}
+	}
 }