OpenCV(C++) - 행렬 연산 02

 

 

   uchar data[] =
   {
      10,200,5,7,9,
      15,35,60,80,170,
      100,2,55,37,70
   };

   Mat m1(3, 5, CV_8U, data);
   Mat m2(3, 5, CV_8U, Scalar(50));
   cout << "[m1] = " << endl << m1 << endl;
   cout << "[m2] = " << endl << m2 << endl;

   Mat rMin;
   min(m1, 30, rMin);         //m1 행렬의 원소 중 30보다 큰 것들은 전부 '30'처리
   cout << "[rMin]=" << endl << rMin << endl;
   Mat rMax;
   max(m1, m2, rMax);         //m1의 원소와 m2의 원소를 비교하여 큰 원소가 반영됨
   cout << "[rMax]=" << endl << rMax << endl;

   double minVal, maxVal;
   Point minLoc, maxLoc;


   minMaxLoc(
      m1,
      &minVal,
      &maxVal,
      &minLoc,
      &maxLoc
   );
   cout << minVal << endl;         //m1 원소의 최소값
   cout << maxVal << endl;         //m1 원소의 최대값
   cout << minLoc << endl;         //
   cout << maxLoc << endl;

 

 

void showMatInfo(Mat mat, string str)
{
	cout << "채널 : " << mat.channels() << "\t\t";
	cout << "행열 : " << mat.size << endl;
	cout << str + " = " << endl << mat << endl;
	cout << "--------------------------------------" << endl << endl;
}

int main(void)
{
	Mat image = imread("image/minMax.jpg", IMREAD_GRAYSCALE);

	double minVal, maxVal;
	minMaxIdx(image, &minVal, &maxVal);
	cout << "최소값 = " << minVal << endl;
	cout << "최대값 = " << maxVal << endl;

	double ratio = (maxVal - minVal) / 255;

	cout << ratio << endl;
	// 0.301961

	Mat dest = (image - minVal) / ratio;

	imshow("dest", dest);
	imshow("image", image);
	waitKey();

}

 

	vector<Point> pt;
	pt.push_back(Point(0, 1));
	pt.push_back(Point(2, 3));
	pt.push_back(Point(4, 5));
	cout << pt << endl;

	Matx22f m(
		0, 1,  // 0 >> 0*0 + 1*1 = 1
		2, 3	// 1 >> 2*0 + 3*1 = 3
	);

	vector<Point> result;
	transform(pt, result, m);
	cout << result << endl;

int main(void)
{
	vector<Point> rect_pt1, rect_pt2;
	rect_pt1.push_back(Point(200, 50));
	rect_pt1.push_back(Point(400, 50));
	rect_pt1.push_back(Point(400, 250));
	rect_pt1.push_back(Point(200, 250));

	float theta = 20 * CV_PI / 180; // 라디안

	Matx22f m(cos(theta), -sin(theta), sin(theta), cos(theta));

	transform(rect_pt1, rect_pt2, m);

	Mat image(400, 500, CV_8UC3, Scalar(255, 255, 255));

	for (int i = 0; i < 4; i++)
	{
		line(image, rect_pt1[i], rect_pt1[(i + 1) % 4], Scalar(0, 0, 0), 1);
		line(image, rect_pt2[i], rect_pt2[(i + 1) % 4], Scalar(255, 0, 0), 2);
		cout << "rect_pt1[" << to_string(i) + "] = " << rect_pt1[i] << "\t";
		cout << "rect_pt2[" << to_string(i) + "] = " << rect_pt2[i] << endl;
	}
	imshow("image", image);
	waitKey();
	return 0;

}