OpenCV基本數據類型

Point_

typedef Point_<int> Point2i;
typedef Point2i Point;
typedef Point_<float> Point2f;
typedef Point_<double> Point2d;

Point3_

typedef Point3_<int> Point3i;
typedef Point3_<float> Point3f;
typedef Point3_<double> Point3d;

Size_

typedef Size_<int> Size2i;
typedef Size2i Size;
typedef Size_<float> Size2f;

Rect_

typedef Rect_<int> Rect;

Matx

typedef Matx<float,1,2> Matx12f;
typedef Matx<double,1,2> Matx12d;
...

Vec

typedef Vec<uchar, 2> Vec2b;
typedef Vec<short,3> Vec3s;
typedef Vec<int, 4> Vec4i;
typddef Vec<float,6> Vec6i;
...

Scalar_

typedef Scalar_<double> Scalar;

Range

class Range
{
public:
...
int start, end;
};

ex:取A的全部行，和 1到180列

	Mat A = imread("b.jpg", CV_LOAD_IMAGE_COLOR);
	Mat B = A(Range::all(), Range(1, 180));

Mat

創建複雜的矩陣

	// make a 7x7 complex matrix filled with 1+3j.
	Mat M(7,7,CV_32FC2,Scalar(1,3));
	// and now turn M to a 100x60 15-channel 8-bit matrix.
	// The old content will be deallocated
	M.create(100,60,CV_8UC(15));

多維數組

	// create a 100x100x100 8-bit array
	int sz[] = {100, 100, 100};
	Mat bigCube(3, sz, CV_8U, Scalar::all(0));

矩陣行操作

	// add the 5-th row, multiplied by 3 to the 3rd row
	M.row(3) = M.row(3) + M.row(5)*3;

矩陣列操作

	// now copy the 7-th column to the 1-st column
	// M.col(1) = M.col(7); // this will not work
	Mat M1 = M.col(1);
	M.col(7).copyTo(M1);

locateROI使用

	Mat A = Mat::eye(10, 10, CV_32S);
	// extracts A columns, 1 (inclusive) to 3 (exclusive).
	Mat B = A(Range::all(), Range(1, 3));
	// extracts B rows, 5 (inclusive) to 9 (exclusive).
	// that is, C ~ A(Range(5, 9), Range(1, 3))
	Mat C = B(Range(5, 9), Range::all());
	Size size; Point ofs;
	C.locateROI(size, ofs);
	// size will be (width=10,height=10) and the ofs will be (x=1, y=5)

矩陣元素訪問：

指針加[ ] 

int sum = 0;
	Mat M = Mat::eye(20, 20, CV_8UC1);
	for (int i=0; i < M.rows; i++)
	{
		const uchar* mi = M.ptr<uchar>(i);
		for (int j=0; j < M.cols; j++)
		{
			sum += mi[j];
		}
	}

迭代

	MatConstIterator_<uchar> it = M.begin<uchar>(), it_end = M.end<uchar>();
	for (; it != it_end; ++it)
		sum += *it;