openCV: Saving Mat to vector<vector<int> >

Question

I have a cv::Mat named myImage which I want to save to an std::vector > named savedVec. This is the code I have written:

for (int i = 0; i < myImage.rows; ++i)
{
    std::vector<int> row(myImage.cols);
    for (int j = 0; j < myImage.cols; ++j)
    {
        row.push_back(Play::getInstance()->getFinder()->getImage().at<uchar>(i, j));
    }
    savedVec.push_back(row);
}

My problem now is that somehow savedVec[0].size() yields twice the size of myImage.cols, but as they should be the same, shouldn't they?
Please tell me what I am doing wrong.

Answer 1

according to c++ reference calling push_back appends elements to the vector so it increases the size from the end

so you have size of at least 2*cols . you should either initialize an empty vector . or use the [] operator .