Matx
轻量级的Mat，必须在使用前规定好大小，比如一个2x3的float型的Matx，可以声明为Matx23f
Vec
Vec是Matx的一个派生类，是一个一维的Matx，跟vector很相似。在OpenCV源码中定义如下：
template<typename _TP, int n> class Vec : public Matx<_Tp, n, > {...};
typedef Vec<uchar, > Vec2b;
Range
使OpenCV的使用更像MATLAB, Range::all()等同于MATLAB的:，Range(a,b)等同于MATLAB的a:b，其中a, b为整型
内存溢出
防止内存溢出的函数有alignPtr, alignSize, allocate, deallocate, fastMalloc, fastFree
math.h函数
float cv::fastAtan2 ( float y, float x ); // 计算向量角度 float cv::cubeRoot (float val); // 计算立方根 int cvCeil (double value);
int cvCeil (float value);
int cvCeil (int value); // 向上取整 int cvFloor (double value);
int cvFloor (float value);
int cvFloor (int value); // 向下取整 int cvRound (double value)
int cvRound (float value)
int cvRound (int value) // 四舍五入 int cvIsInf (double value);
int cvIsInf (float value); // 自变量是否无穷大 int cvIsNaN (double value);
int cvIsNaN (float value); // 自变量是否为NaN
文字显示函数
Size cv::getTextSize( const String & text, int fontFace, double fontScale, int thickness, int * baseLine );
// Calculates the width and height of a text string.
// baseLine: y-coordinate of the baseline relative to the bottom-most text point. void cv::putText (InputOutputArray img, const String &text, Point org, int fontFace, double fontScale, Scalar color, int thickness=, int lineType=LINE_8, bool bottomLeftOrigin=false)
// Renders the specified text string in the image. void cvInitFont( CvFont * font, int font_face, double hscale, double vscale, double shear = , int thickness = , int line_type = )
// Initializes the font structure that can be passed to text rendering functions.
作图函数
可参考链接
void cv::circle (InputOutputArray img, Point center, int radius, const Scalar &color, int thickness=, int lineType=LINE_8, int shift=);
// Draw a circle. bool cv::clipLine (Size imgSize, Point &pt1, Point &pt2)
// Clips the line against the image rectangle. void cv::ellipse (InputOutputArray img, Point center, Size axes, double angle, double startAngle, double endAngle, const Scalar &color, int thickness=, int lineType=LINE_8, int shift=)
// Draws a simple or thick elliptic arc or fills an ellipse sector. void cv::ellipse (InputOutputArray img, const RotatedRect &box, const Scalar &color, int thickness=, int lineType=LINE_8) void cv::ellipse2Poly (Point center, Size axes, int angle, int arcStart, int arcEnd, int delta, std::vector< Point > &pts)
// Approximates an elliptic arc with a polyline. void cv::line (InputOutputArray img, Point pt1, Point pt2, const Scalar &color, int thickness=, int lineType=LINE_8, int shift=)
// Draws a line segment connecting two points. void cv::polylines (Mat &img, const Point *const *pts, const int *npts, int ncontours, bool isClosed, const Scalar &color, int thickness=, int lineType=LINE_8, int shift=) void cv::polylines (InputOutputArray img, InputArrayOfArrays pts, bool isClosed, const Scalar &color, int thickness=, int lineType=LINE_8, int shift=)
// Draws several polygonal curves. class cv::LineIterator;
填充函数
void cv::fillConvexPoly (Mat &img, const Point *pts, int npts, const Scalar &color, int lineType=LINE_8, int shift=) void cv::fillConvexPoly (InputOutputArray img, InputArray points, const Scalar &color, int lineType=LINE_8, int shift=)
// Fills a convex polygon. void cv::fillPoly (Mat &img, const Point **pts, const int *npts, int ncontours, const Scalar &color, int lineType=LINE_8, int shift=, Point offset=Point()) void cv::fillPoly (InputOutputArray img, InputArrayOfArrays pts, const Scalar &color, int lineType=LINE_8, int shift=, Point offset=Point())
// Fills the area bounded by one or more polygons.
随机数生成器
class RNG;