OpenCV学习笔记-霍夫线变换2

采用参数形式为：
CV_HOUGH_PROBABILISTIC进行变化。

具体实现代码为：

#include "stdafx.h"
#include <cv.h>
#include <highgui.h>
#include <math.h>
int main(int argc, char** argv)
{
	IplImage* src;
	src=cvLoadImage("building.jpg",0);
	IplImage* dst = cvCreateImage( cvGetSize(src), 8, 1 );
	IplImage* color_dst = cvCreateImage( cvGetSize(src), 8, 3 );
	CvMemStorage* storage = cvCreateMemStorage(0);
	CvSeq* lines = 0;
	int i;
	cvCanny( src, dst, 50, 200, 3 );
	cvCvtColor( dst, color_dst, CV_GRAY2BGR );
	lines = cvHoughLines2( dst, storage, CV_HOUGH_STANDARD, 1, CV_PI/180, 150, 0, 0 );
	for( i = 0; i < lines->total; i++ )
	{
		float* line = (float*)cvGetSeqElem(lines,i);
		float rho = line[0];
		float theta = line[1];
		CvPoint pt1, pt2;
		double a = cos(theta), b = sin(theta);
		if( fabs(a) < 0.001 )
		{
			pt1.x = pt2.x = cvRound(rho);
			pt1.y = 0;
			pt2.y = color_dst->height;
		}
		else if( fabs(b) < 0.001 )
		{
			pt1.y = pt2.y = cvRound(rho);
			pt1.x = 0;
			pt2.x = color_dst->width;
		}
		else
		{
			pt1.x = 0;
			pt1.y = cvRound(rho/b);
			pt2.x = cvRound(rho/a);
			pt2.y = 0;
		}
		cvLine( color_dst, pt1, pt2, CV_RGB(255,0,0), 3, 8 );
	}

	cvNamedWindow( "Source", 1 );
	cvShowImage( "Source", src );
	cvNamedWindow( "Hough", 1 );
	cvShowImage( "Hough", color_dst );
	cvWaitKey(0);
}

结果为：



参考资料：

1.学习OpenCV，于仕祺，刘瑞祯，清华大学出版，pp.175-179
2.http://www.opencv.org.cn/index.php/Cv%E5%9B%BE%E5%83%8F%E5%A4%84%E7%90%86#HoughLines
3.OpenCV文档，路径："OpenCV2.2\doc\opencv.pdf"