OpenCV：Snake方法检测可变形体的轮廓

标签：opencv

<span style="font-size:14px;">#include <iostream>
#include <string.h>
#include <opencv\cxcore.h>
#include <opencv\cv.h>
#include <opencv\highgui.h>
#include <opencv\cvaux.h>
#include <fstream>

IplImage *image = 0 ;
IplImage *image2 = 0 ;

using namespace std;
int Thresholdness = 141;
int ialpha = 20;
int ibeta=20;
int igamma=20;

void onChange(int pos){

    if(image2) cvReleaseImage(&image2);
    if(image) cvReleaseImage(&image);

    image2 = cvLoadImage("grey.bmp",1); // 显示图片
    image= cvLoadImage("grey.bmp",0);

    cvThreshold(image,image,Thresholdness,255,CV_THRESH_BINARY); // 分割阈值

    CvMemStorage* storage = cvCreateMemStorage(0);
    CvSeq* contours = 0;

    cvFindContours( image, storage, &contours, sizeof(CvContour), // 查找初始化轮廓
        CV_RETR_EXTERNAL , CV_CHAIN_APPROX_SIMPLE );

    if(!contours) return ;
    int length = contours->total;
    if(length<10) return ;
    CvPoint* point = new CvPoint[length]; // 分配轮廓点

    CvSeqReader reader;
    CvPoint pt= cvPoint(0,0);;
    CvSeq *contour2=contours;

    cvStartReadSeq(contour2, &reader);
    for (int i = 0; i < length; i++){

        CV_READ_SEQ_ELEM(pt, reader);
        point[i]=pt;
    }
    cvReleaseMemStorage(&storage);

    // 显示轮廓曲线
    for(int i=0;i<length;i++){

        int j = (i+1)%length;
        cvLine( image2, point[i],point[j],CV_RGB( 0, 0, 255 ),1,8,0 );
    }

    float alpha=ialpha/100.0f;
    float beta=ibeta/100.0f;
    float gamma=igamma/100.0f;

    CvSize size;
    size.width=3;
    size.height=3;
    CvTermCriteria criteria;
    criteria.type=CV_TERMCRIT_ITER;
    criteria.max_iter=1000;
    criteria.epsilon=0.1;
    cvSnakeImage( image, point,length,&alpha,&beta,&gamma,CV_VALUE,size,criteria,0 );

    // 显示曲线
    for(int i=0;i<length;i++){

        int j = (i+1)%length;
        cvLine( image2, point[i],point[j],CV_RGB( 0, 255, 0 ),1,8,0 );
    }
    delete []point;

}

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

    cvNamedWindow("win1",0);
    cvCreateTrackbar("Thd", "win1", &Thresholdness, 255, onChange);
    cvCreateTrackbar("alpha", "win1", &ialpha, 100, onChange);
    cvCreateTrackbar("beta", "win1", &ibeta, 100, onChange);
    cvCreateTrackbar("gamma", "win1", &igamma, 100, onChange);
    cvResizeWindow("win1",300,500);
    onChange(0);

    for(;;){

        if(cvWaitKey(40)==27) break;
        cvShowImage("win1",image2);
    }

    return 0;
}
</span>

运行结果截图：

OpenCV：Snake方法检测可变形体的轮廓

标签：opencv

原文地址：http://blog.csdn.net/u010002704/article/details/43734993