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