OPENCV Study Notes (7): Usage of cvrectangle and Cv::rectangle

The first time you use Cvrectangle to draw a rectangle, you encounter a problem:Error: There is no appropriate conversion function from "Cv::mat" to "cvarr*" , we have checked the data, and summarized the following.

Comparison of Cvrentangle and Cv::rectangle function prototypes:

C:       void cvrectangle( cvarr*img, Cvpointpt1, Cvpoint pt2, CvscalarColor, intthickness=1, intLine_type=8, intShift=0)

C + +:   void rectangle ( mat&  img , point  pt1 , point  pt2 , const scalar&  color , int  thickness =1, int  linetype =8, int  shift =0 )

C + +: void rectangle(mat& img, Rect rec, const scalar& color, int thickness=1, int linetype=8, int shift=0 )

Parameter description:

Img

image.

Pt1

a vertex of the rectangle.

Pt2

another vertex on the diagonal of the rectangle

Color

Line Color (RGB) or luminance (grayscale image) (grayscale images).

Thickness

The thickness of the

line that makes up the rectangle. A negative value (such as the cv_filled) function draws a color-filled rectangle.

Line_type

the type of the line. See Cvline's description

Shift

the number of decimal places for the coordinate point.

Code:

#include <iostream> #include <opencv2\highgui\highgui.hpp>using namespace std;using namespace Cv;int main ( {Char *imagesrc = "I:\\opencv learning\\picture\\sumpalace.jpg"; Mat matimage = Imread (imagesrc,-1);        Iplimage *iplimage = Cvloadimage (imagesrc,-1); if (matimage.data==0| | Iplimage->imagedata ==0) {cout<< "picture loading Failed" <<endl;return-1;} Cv::rectangle (Matimage,cvpoint (20,200), Cvpoint (200,300), Scalar (255,0,0), 1,1,0),//rect (int a,int b,int c,int d) A, b is the upper-left coordinate of the rectangle, c,d the length and width of the rectangle Cv::rectangle (Matimage,rect (100,300,20,200), Scalar (0,0,255), 1,1,0), Cvrectangle (Iplimage, Cvpoint (20,200), Cvpoint (200,300), Scalar (0,255,255), 1,1,0), Imshow ("Matimage", Matimage), Cvshowimage ("Iplimage", Iplimage); Waitkey (); return 0;}

Results:

If you need to draw a rectangle on a chart of the mat type, select Cv::trctangle ()

Draw a rectangle on a diagram of type iplimage*, select Cvrectangle ()

OPENCV Study Notes (7): Usage of cvrectangle and Cv::rectangle