OpenCV成长之路(8)：直线、轮廓的提取与描述

1 void HoughLinesP(InputArray image, OutputArray lines, double rho, double theta,int threshold, double minLineLength=0, double maxLineGap=0 );

 1 int main()  2 {  3     Mat image=imread("../car.png");  4     Mat I;  5     cvtColor(image,I,CV_BGR2GRAY);  6     
 7     Mat contours;  8     Canny(I,contours,125,350);  9     threshold(contours,contours,128,255,THRESH_BINARY); 10 
11     vector<Vec4i> lines; 12     // 检测直线，最小投票为90，线条不短于50，间隙不小于10
13     HoughLinesP(contours,lines,1,CV_PI/180,80,50,10); 14     drawDetectLines(image,lines,Scalar(0,255,0)); 15 
16     namedWindow("Lines"); 17     imshow("Lines",image); 18     waitKey(); 19     return 0; 20 }

 1 void drawDetectLines(Mat& image,const vector<Vec4i>& lines,Scalar & color)  2 {  3     // 将检测到的直线在图上画出来
 4     vector<Vec4i>::const_iterator it=lines.begin();  5     while(it!=lines.end())  6     {  7         Point pt1((*it)[0],(*it)[1]);             
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