Assertion failed in unknown function ../../ocv/opencv/modules/imgproc/src/imgwarp.cpp

问题

Hey please can someone help me to found the solution of this error :

i try to compile the code that exist in this link : http://ipwithopencv.googlecode.com/svn/trunk/ThinPlateSpline/ThinPlateSpline/

im using 2 classes and the main:

here is my main code :

#include "stdafx.h"
#include <cv.h>
#include <cxcore.h>
#include <highgui.h>
#include "CThinPlateSpline.h"
#include "iostream"

using namespace std; 

int _tmain(int argc, _TCHAR* argv[])
{

    // load a nice picture

    cv::Mat img = cv::imread("lena.jpg");

    // generate some generic points
    // usually you would use a interest point detector such as SURF or SIFT
    std::vector<cv::Point> iP, iiP;

    // push some points into the vector for the source image
    iP.push_back(cv::Point(50,50));
    iP.push_back(cv::Point(400,50));
    iP.push_back(cv::Point(50,400));
    iP.push_back(cv::Point(400,400));
    iP.push_back(cv::Point(256,256));
    iP.push_back(cv::Point(150,256));

    // push some point into the vector for the dst image
    iiP.push_back(cv::Point(70,70));
    iiP.push_back(cv::Point(430,60));
    iiP.push_back(cv::Point(60,410));
    iiP.push_back(cv::Point(430,420));
    iiP.push_back(cv::Point(220,280));
    iiP.push_back(cv::Point(180,240));

    // create thin plate spline object and put the vectors into the constructor
    CThinPlateSpline tps(iP,iiP);


    // warp the image to dst
    Mat dst;
    tps.warpImage(img,dst,0.01,INTER_CUBIC,BACK_WARP);


    // show images
    cv::imshow("original",img);
    cv::imshow("distorted",dst);
    //cv::waitKey(0);
    //Sleep(5);
    cv::waitKey(5000); 
    return 0;
}

here is the is the imagewarp method :

void CThinPlateSpline::warpImage(const Mat& src, Mat& dst, float lambda, const int interpolation,const TPS_INTERPOLATION tpsInter)
{
    Size size = src.size();
    dst = Mat(size,src.type());

    // only compute the coefficients new if they weren't already computed
    // or there had been changes to the points
    if(tpsInter == BACK_WARP && !FLAG_COEFFS_BACK_WARP_SET)
    {
        computeSplineCoeffs(pSrc,pDst,lambda,tpsInter);
    }
    else if(tpsInter == FORWARD_WARP && !FLAG_COEFFS_FORWARD_WARP_SET)
    {
        computeSplineCoeffs(pSrc,pDst,lambda,tpsInter);
    }

    computeMaps(size,mapx,mapy);

    remap(src,dst,mapx,mapy,interpolation);
}

there is to other classes that exist in the link also CthinPlateSpline.cpp and CthinPlateSpline.h ...please i really need help and sorry for my bad english

回答1:

I can run these on my mac with OpenCV 2.4.7

The result image is a twisted lena

I just change two places as following

First of all, I change the included file in main.cpp to become

#include <opencv2/opencv.hpp>
#include "CThinPlateSpline.h"
#include <iostream>
#include <vector>

And included file in CThinPlateSpline.cpp to become

#include <vector>
#include <opencv2/opencv.hpp>
#include "CThinPlateSpline.h"

I use only 3 files main.cpp, CThinPlateSpline.cpp, and CThinPlateSpline.h

libraries linked are

-lopencv_imgproc -lopencv_core -lopencv_highgui

回答2:

"Assertion failed" in OpenCV usually happens when your input Mat has incorrect size, e.g. zero (empty Mat) or less than the requirement of the function.

Would you mind to check img after cv::Mat img = cv::imread("lena.jpg"); by img.empty() or display img by imshow?

来源：https://stackoverflow.com/questions/20681719/assertion-failed-dst-data-src-data-in-unknown-function-ocv-opencv-mo

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