Opencv step by step

有时候我们需要在图像上写一些字或者画一些简单的几何图案。

祭上代码：

#include <cv.h>
#include <highgui.h>

int main(int argc,char **argv)
{

	cvNamedWindow("image output");
	IplImage *src = cvCreateImage(cvSize(800,600),IPL_DEPTH_8U,3); 

	//draw line
	cvLine(src, cvPoint(10,10), cvPoint(400,300), CV_RGB(255,166,177));
	//draw rectangle
	cvRectangle(src, cvPoint(100,20), cvPoint(300,500), CV_RGB(0,0,255));
	//draw ellipse
	cvEllipse(src, cvPoint(400,300), cvSize(200,100), 50, 0, 200, CV_RGB(0,255,0));
	//draw font
	char *text = "This is freaking fantastic!";
	CvFont my_font;
	cvInitFont(&my_font, CV_FONT_HERSHEY_SCRIPT_COMPLEX, 1, 1);
	cvPutText(src, text, cvPoint(300, 400), &my_font, CV_RGB(100,255,0));

	cvShowImage("image output", src);
	cvWaitKey();

	cvReleaseImage(&src);
	cvDestroyWindow("image output");
}

注释里面写的比较清楚，这里画了直线，长方体，椭圆和文字。

效果图：