OpenCV(C++) - User Interface 02

#include <opencv2/opencv.hpp>

using namespace cv;
using namespace std;


string title = "Event Drawing";
Mat image;

void onMouse(int event, int x, int y, int flags, void* param)
{
	static Point pt(-1, -1);

	switch (event)
	{
	case EVENT_LBUTTONDOWN:
		if (pt.x < 0)
			pt = Point(x, y);
		else
		{
			rectangle(image, pt, Point(x, y), Scalar(50), 2);
			imshow(title, image);
			pt = Point(-1, -1);
		}
		break;

	case EVENT_RBUTTONDOWN:
		if (pt.x < 0)
			pt = Point(x, y);
		else
		{
			Point2d pt2 = pt - Point(x, y);
			int radius = (int)sqrt(pt2.x * pt2.x + pt2.y * pt2.y);
			circle(image, pt, radius, Scalar(150), 2);
			imshow(title, image);
			pt = Point(-1, -1);
		}
		break;
	}
}

int main(void)
{
	image = Mat(300, 500, CV_8UC1, Scalar(255));

	imshow(title, image);
	setMouseCallback(title, onMouse, 0);

	waitKey(0);
	return 0;
}

별 그리기

#include <opencv2/opencv.hpp>
#include <cmath>

using namespace cv;
using namespace std;


string title = "Star Drawing"; 
Mat image(400, 600, CV_8UC3, Scalar(255, 255, 255));

int main(void)
{
	int num = 5;
	int radius = 100;
	double deg = 360 / num; // degree
	double rad = deg / 180.0 * 3.141592;
	Point pt_zero = Point(300, 200);
	Point* pt;
	double pt_rad = 0;

	pt = new Point[num];

	for (int i = 0; i < num; i++)
	{
		pt[i].x = pt_zero.x + (radius * cos(pt_rad));
		pt[i].y = pt_zero.y + (radius * sin(pt_rad));
		pt_rad += rad;
	}

	for (int i = 0; i < num; i++)
	{
		int j = i + 2;
		j %= num;

		line(image, pt[i], pt[j], Scalar(255, 0, 0), 4, LINE_AA);
	}
	line(image, pt_zero, pt_zero, Scalar(255, 0, 0), 4, LINE_AA);
	imshow(title, image);

	waitKey(0);
	return 0;

}

#include <opencv2/opencv.hpp>
#include <cmath>

using namespace cv;
using namespace std;


string title = "Star Drawing";
Mat image(400, 600, CV_8UC3, Scalar(255, 255, 255));

int main(void)
{
	Mat img = imread("Image/cat1.jpg", IMREAD_COLOR);


	cout << format("dims(%d)", img.dims) << endl;				// 차원
	cout << format("width(%d)", img.size().width) << endl;			// 가로
	cout << format("height(%d)", img.size().height) << endl;		// 세로
	cout << format("rows(%d)", img.rows) << endl;				// 가로
	cout << format("cols(%d)", img.cols) << endl;				// 세로
	cout << img.size() << endl;										//

	cout << format("depth(%d)", img.depth()) << endl;				//
	cout << format("channels(%d)", img.channels()) << endl;			// 점의 개수
	cout << format("total(%d)", img.total()) << endl;			// 점의 개수
	cout << img.rows * img.cols << endl;					// 점 1개당 바이트 수
	cout << format("elemSize(%d)", img.elemSize()) << endl;			// 점 1개의 칼라 바이트 수
	cout << "type" << img.type() << " " << CV_8UC3 << endl;			//

	Rect roi(0, 0, 3, 2); // Region of Interest
	cout << img(roi) << endl;

	imshow(title, img);
	waitKey(0);
	return 0;

}

그레이스케일 값 넣어보기

int main(void)
{
	Mat img = imread("image/cat1.jpg", IMREAD_COLOR);

	for (int row = 0; row < img.rows; row++)
	{
		for (int col = 0; col < img.cols; col++)
		{
			Vec3b v = img.at<Vec3b>(row, col);
			uchar value = (uchar)((double)v[0] * 0.11 + (double)v[1] * 0.3 + (double)v[2] * 0.59);
			Vec3b result(value, value, value);
			img.at<Vec3b>(row, col) = result;
		}
	}

	imshow("img", img);
	waitKey();

}

파일 압축 복사하기

int main(void)
{
	Mat img = imread("Image/cat1.jpg", IMREAD_COLOR);

	vector<int> att;
	att.push_back(IMWRITE_JPEG_QUALITY);
	att.push_back(25); // 95

	imwrite("Image/cat1_001.jpg", img); // 파일 복사하기
	imwrite("Image/cat1_002.jpg", img, att); // 파일 복사하기


	waitKey(0);
	return 0;

}

 

 

int main(void)
{
	Mat img1 = imread("Image/고기.jpg", IMREAD_COLOR);
	Mat img2;
	flip(img1, img2, 0);  // 0 : x 축

	Mat img3;
	flip(img1, img3, 1);  // 1 : y 축

	Mat img4;
	flip(img1, img4, -1);  // -1 : 원점대칭

	Mat img5;
	repeat(img1, 2, 3, img5);//2행3열만큼 반복(6개)

	Mat img6;
	transpose(img1, img6);   //90도 회전전치

	imshow("img1", img1);
	imshow("img2", img2);
	imshow("img3", img3);
	imshow("img4", img4);
	imshow("img5", img5);
	imshow("img6", img6);


	waitKey(0);
	return 0;

}

 

flip 사용하지 않고 90도 회전, 상하좌우 만들기

	Mat img7(img1.rows, img1.cols, CV_8UC3);
	Mat img8(img1.cols, img1.rows, CV_8UC3);

	for (int rows = 0; rows < img1.rows; rows++)
	{
		for (int cols = 0; cols < img1.cols; cols++)
		{
			Vec3b v = img1.at<Vec3b>(rows, cols);
			img7.at<Vec3b>(rows, img1.cols - 1 - cols) = v;
			img8.at<Vec3b>(img1.cols - 1 - cols, rows) = v;
		}
	}

	imshow("img7", img7);
	imshow("img8", img8);