Convert Mat to vector and Vector to mat in opencv

Question

i want to Convert Mat to vector and Vector to mat in opencv .

my code :

     void mat_to_vector(Mat in,vector &out){

        for          


        

Answer 1

I think my code will be useful for you:

// 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 <<endl;
// wait for a key
getchar();

Answer 2

This is how I do it. The first function is inspired by https://stackoverflow.com/a/26685567 . The output of VectorToMat is in CV _8U.

void MatToVector(const Mat& in, vector<float>& out) 
// Convert a 1-channel Mat<float> object to a vector. 
{
if (in.isContinuous()) { out.assign((float*)in.datastart, (float*)in.dataend); }
                else {   
                for (int i = 0; i < in.rows; ++i) 
                { out.insert(out.end(), in.ptr<float>(i), in.ptr<float>(i) + in.cols); }
                }     return;
}


void VectorToMat(const vector<float>& in,  Mat& out)    
{
vector<float>::const_iterator it = in.begin();
MatIterator_<uchar> jt, end;
jt = out.begin<uchar>();
for (; it != in.end(); ++it) { *jt++ = (uchar)(*it * 255); } 
}