cv::Mat和std::vector的相互转化

声明：代码来自StackOverFlow，原文链接

using namespace cv;

// Generate some test data
int r = 3;
int c = 3;
Mat M( r, c, CV_32FC1 );

for( int i = 0; i < r*c; ++i )
{
    M.at<float>(i)=i;
}

// print out matrix
cout << M << endl;

// Create vector from matrix data (data with data copying)
vector<float> V;
V.assign ( ( float* )M.datastart, ( float* )M.dataend );

// print out vector
cout << "Vector" << endl;
for ( int i = 0; i < r * c; ++i )
{
    cout << V[i] << endl;
}

// Create matrix from vector

// Without copying data (only pointer assigned)
//Mat M2=Mat(r,c,CV_32FC1,(float*)V.data());

// With copying data
Mat M2=Mat(r,c,CV_32FC1);
memcpy(M2.data,V.data(),V.size()*sizeof(float));

// Print out matrix created from vector
cout << "Second matrix" << endl;
cout << M2 <