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You can create a matrix from you "table of values" and then call cv::calcHist on this matrix, because OpenCV can build histograms for CV_8U and CV_32F types. Here is how you can create a matrix from an array of floats:
float* Idata=new float[480*640*3];
Mat I(480, 640, CV_32FC3, Idata);
More examples in the OpenCV Cheatsheet. And you can always build a Mat on top of std::vector.