Core module Other common knowledge points [OpenCV Note 14]

mATX

Lightweight mat, must be before the use of a good size, such as a 2x3 float type of matx, can be declared as matx23f

Vec

VEC is a derived class of mATX, a one-dimensional matx, similar to vectors. The following are defined in the OPENCV source code:

int 1> {...}; typedef VEC2> vec2b;

Range

Make the use of OpenCV more like Matlab, Range::all () is equivalent to Matlab:, Range (A, B) is equivalent to the a:b of Matlab, where a is integer type

Memory overflow

functions to prevent memory overflow are alignptr, alignsize, allocate, deallocate, Fastmalloc, Fastfree

math.h function

floatCv::fastatan2 (floatYfloatx);//Calculate vector AnglefloatCv::cuberoot (floatVal);//Calculate cube RootintCvceil (Doublevalue);intCvceil (floatvalue);intCvceil (intValue);//Rounding upintCvfloor (Doublevalue);intCvfloor (floatvalue);intCvfloor (intValue);//Rounding downintCvround (Doublevalue)intCvround (floatvalue)intCvround (intValue//RoundingintCvisinf (Doublevalue);intCvisinf (floatValue);//whether the independent variable is infinitely largeintCvisnan (Doublevalue);intCvisnan (floatValue);//whether the argument is Nan

Text Display function

Size cv::gettextsize (const String & text,intFontface,DoubleFontscale,intThicknessint*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::p uttext (inputoutputarray img, const String&text, point org,intFontface,DoubleFontscale, Scalar color,intthickness=1,intLinetype=line_8,BOOLbottomleftorigin=false)//renders the specified text string in the image.void Cvinitfont (Cvfont* Font,intFont_face,DoubleHscale,DoubleVscale,DoubleShear =0,intThickness =1,intLine_type =8 )       //initializes the font structure that can is passed to text rendering functions.

Graphing function

Refer to Links

void Cv::circle (Inputoutputarray img, point Center,intRADIUS, const Scalar &color,intthickness=1,intLinetype=line_8,int Shift=0);//Draw a circle.BOOLCv::clipline (Size imgsize, point &pt1, Point &pt2)//Clips the line against the image rectangle.void Cv::ellipse (inputoutputarray img, point Center, Size axes,DoubleAngleDoubleStartAngle,DoubleEndangle, const Scalar &color,intthickness=1,intLinetype=line_8,int Shift=0)//draws a simple or thick elliptic arc or fills an ellipse sector.void Cv::ellipse (Inputoutputarray img, const rotatedrect&box, const Scalar &color,intthickness=1,intLinetype=line_8) void Cv::ellipse2poly (Point center, Size axes,intAngleintArcstart,intArcend,intDelta, std::vector< point > &pts)//approximates an elliptic arc with a polyline.void Cv::line (Inputoutputarray img, point pt1, point pt2, const Scalar&color,intthickness=1,intLinetype=line_8,int Shift=0)//draws a line segment connecting and points.void CV::p olylines (Mat&img, Const point *const *pts, constint*npts,intNcontours,BOOLisClosed, const Scalar &color,intthickness=1,intLinetype=line_8,int Shift=0) void CV::p olylines (Inputoutputarray img, inputarrayofarrays pts,BOOLisClosed, const Scalar &color,intthickness=1,intLinetype=line_8,int Shift=0)//draws several polygonal curves.class Cv::lineiterator;

Fill function

void Cv::fillconvexpoly (Mat &img, const point *pts,intnpts, const Scalar &color,intLinetype=line_8,int Shift=0) void Cv::fillconvexpoly (Inputoutputarray img, Inputarray points, const Scalar&color,intLinetype=line_8,int Shift=0)//Fills a convex polygon.void Cv::fillpoly (Mat&img, const point **pts, constint*npts,intncontours, const Scalar &color,intLinetype=line_8,int Shift=0, point offset=Point ()) void Cv::fillpoly (Inputoutputarray img, inputarrayofarrays pts, const Scalar&color,intLinetype=line_8,int Shift=0, point offset=Point ())//Fills the area bounded by one or more polygons.

Random number generator

Class RNG;

Core module Other common knowledge points [OpenCV Note 14]