OpenCV findContours function problem

I am trying to use the findContours function in OpenCV, but VS 2008 gives an error saying:

OpenCV Error: Bad flag (parameter or structure field) (Unrecognized or unsupport ed array type) in unknown function, file ........\ocv\opencv\src\cxcore\cxarr ay.cpp, line 2476

This application has reques开发者_如何学编程ted the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. Press any key to continue . . .

Here's the code:

Mat_<Vec<float,3>> originalimage;

Mat_<Vec<float,3>> resultingimage;

vector<vector<cv::Point>> v;

originalimage = cv::imread("Original.ppm");

cv::findContours(originalimage,v,CV_RETR_LIST,CV_CHAIN_APPROX_NONE);

Thanks in advance

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FindContours only accepts binary image. That is , any image which is output of cvThreshold cvAdapiveThreshold cvCanny

try adding this statement before cv::findContours

cvThreshold(originalImage,resultingImage,100,100,CV_THRESH_BINARY) 

then call findcontours with resultingImage.

if it works then you should input the correct parameters to cvThreshold ( 100 is just an example).Check the reference for that matter.

EDIT: resultingImage should be a single channel image!!

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I have had the same problem (or at least a similar one) with that function. I was not able to fix it, so I used the old C style cvFindContours function instead. I have included an example function in wich I used the cvFindContours function to clean up a blob image. This might not be the fastest solution, but at leas it works.

void filtBproject(Mat& Bproject){

    Scalar          color       = CV_RGB(255,255,255); // text color
    IplImage*       BprojectIpl =  &IplImage(Bproject);
    CvMemStorage*   storage     = cvCreateMemStorage(0);
    CvSeq*          contours    = 0;
    int             numCont     = 0;
    int             contAthresh = 45;

    numCont= cvFindContours( BprojectIpl, storage, &contours, sizeof(CvContour),
                    CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, cvPoint(0,0) );

    cvSet(BprojectIpl, cvScalar(0,0,0));
    for( ; contours != 0; contours = contours->h_next )
        {

            if ( (cvContourArea(contours, CV_WHOLE_SEQ) > contAthresh) ){
                cvDrawContours( BprojectIpl, contours, color, color, -1, CV_FILLED, 8 );
            }
        }
}

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For your v vector, you need to add a space like so:

vector<vector<cv::Point> > v;

Very subtle and dumb but it works.