Need help in opencv sequences !

I'm using opencv sequences to store points resulted from cvhoughline2.

I create the sequence and make some operations on it, but when I run the program it breaks in the line cvseqremove(seq,index) and gives me the exception:

exception at memory location

When I put the cursor on the seq in cvseqremove(seq,index), it writes to me: h_prev=0*000000000000000.

I wrote that code, i'll appreciate any help

void APPROXIMATE_LINES(IplImage* image,unsigned int xsize,unsigned int ysize,double width)
{
    unsigned int i;
    IplImage* color_dst = cvCreateImage(cvGetSize(image), 8,3);
    IplImage* dst = cvCreateImage(cvGetSize(image), 8,1);
    CvMemStorage* storage = cvCreateMemStorage(0);
    CvSeq* Filtered_Lines=0;
    boolean isbreak;
    double distance=4.0;
    CvPoint Mid_Point;
    CvPoint First_Mid_Point;
    CvSeq* lines = cvCreateSeq(CV_SEQ_ELTYPE_POINT,sizeof(CvSeq),sizeof(CvPoint),storage);
    cvCanny(image,dst,180,250,3);
    cvCvtColor(dst,color_dst,CV_GRAY2BGR);

    lines = cvHoughLines2(dst, storage, CV_HOUGH_PROBABILISTIC, 4, CV_PI/165, 95, 93, 75);
    while (lines->total>1)
    {
        CvPoint* First_Line = (CvPoint*)cvGetSeqElem(lines,0);
        First_Mid_Point=mid(First_Line[0],First_Line[1]);
        isbreak=FALSE;

        for( i =1; i < lines->total; i++ )
        {
            CvPoint* line = (CvPoint*)cvGetSeqElem(lines,i);
            Mid_Point=mid(line[0],line[1]);
            if(dist(First_Mid_Point.x,First_Mid_Point.y,Mid_Point.x,Mid_Point.y)<distance)
            {
                cvSe开发者_Python百科qRemove(lines,i);
                isbreak=TRUE;
                break;
            }
        }       /*End_for*/

        if(!isbreak)
        {
            cvSeqPushFront(Filtered_Lines,First_Line); // <--- breaks here
            cvSeqRemove(lines,0);
        }
    } /*End_while*/


    for(i=0;i<Filterd_Lines;i++)
    {
        CvPoint* Filtered = (CvPoint*)cvGetSeqElem(Filterd_Lines,i);
        cvLine(color_dst, Filtered[0], Filtered[1], cvScalar(0,0,255,0),1,8,0);
    }

    cvNamedWindow( "Example1", CV_WINDOW_AUTOSIZE );
    cvShowImage( "Example1",color_dst);
    cvWaitKey(0);
    cvReleaseImage( &color_dst);
    cvDestroyWindow( "Example1" );
}

The function signature is:

void cvSeqRemove(CvSeq* seq, int index)

But on one part of the code you are doing:

cvSeqRemove(lines,&i);

Which means you are passing the memory address of the variable i instead of it's value, and this is not what you want to do.

There might be other bugs.