OpenCV greyscale image to vector

Question

I want to save my grayscale image of type Mat into a list of vectors. They greyscale image contains values such as 110, 123, 150, etc... and when I use my code to transfer the data into a list of vectors and after I have transfered the data, I print the items in the list of vectors and they are values such as -155552323 or 75694920. Where have my nice 110, 123, 150 from before gone??

cv::Mat grayscaleFrame;
cv::Mat image;
image = cv::imread(fullPath);

        cvtColor(image, grayscaleFrame, CV_BGR2GRAY);
        equalizeHist(grayscaleFrame, grayscaleFrame);
        cout << grayscaleFrame << endl;

        vector<int> **vectorList = new vector<int>*[grayscaleFrame.rows];

        for(size_t i=0; i<grayscaleFrame.rows;i++)
        {
            int *p = grayscaleFrame.ptr<int>(i); // pointer to row 0
            std::vector<int> row(p, p+grayscaleFrame.cols); 
            vectorList[i]=&row;

            for(int a =0; a<vectorList[i]->size();a++)
            {
                cout << vectorList[i]->at(a) << endl;
            }

        }

If my mistake is to use &row then how can I accomplish this without addressing the address, because when I remove the & I get the error: "No suitable conversion function from ...."

Answer 1

The problem is in int type of vector elements, they shuld be unsigned char.

But when you print it use cout << (int)your_value << endl;