consertando.cpp

cv::Mat glcm(256, 256, CV_8UC1);
int glcmMat[256][256];

for (int i = 0; i < inputImg.rows - 1; ++i)
    for (int j = 0; j < inputImg.cols - 1; ++j)
     glcmMat[(int)inputImg.at<uchar>(i,j)][(int)inputImg.at<uchar>(i, j+1)]++;

for (int i = 0; i < 256; ++i)
    for (int j = 0; j < 256; ++j)
      glcm.at<uchar>(i,j) = (uchar)glcmMat[i][j];

cv::FileStorage fs(filename, cv::FileStorage::WRITE);
fs << "glcmMat" << glcm;