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The following code is some sample code from a project I am doing in C++. It uses as input two gradient containers to define the orientation of the gradient for each point.

Mat calculateOrientations(Mat gradientX, Mat gradientY){
    // Create container element
    Mat orientation = Mat(gradientX.rows, gradientX.cols, CV_32F);

    // Calculate orientations of gradients --> in degrees
    // Loop over all matrix values and calculate the accompagnied orientation
    for(int i = 0; i < gradientX.rows; i++){
        for(int j = 0; j < gradientX.cols; j++){
            // Retrieve a single value
            float valueX = gradientX.at<float>(i,j);
            float valueY = gradientY.at<float>(i,j);
            // Calculate the corresponding single direction, done by applying the arctangens function
            float result = fastAtan2(valueX,valueY);
            // Store in orientation matrix element
            orientation.at<float>(i,j) = result;
        }
    }

    return orientation;
}

Using this information, you can decide to calculate the average orientation for like a bin of 5x5 pixels easily. Hope this helps you out!

The following code is some sample code from a project I am doing in C++. It uses as input two gradient containers to define the orientation of the gradient for each point.

Mat calculateOrientations(Mat gradientX, Mat gradientY){
    // Create container element
    Mat orientation = Mat(gradientX.rows, gradientX.cols, CV_32F);

    // Calculate orientations of gradients --> in degrees
    // Loop over all matrix values and calculate the accompagnied orientation
    for(int i = 0; i < gradientX.rows; i++){
        for(int j = 0; j < gradientX.cols; j++){
            // Retrieve a single value
            float valueX = gradientX.at<float>(i,j);
            float valueY = gradientY.at<float>(i,j);
            // Calculate the corresponding single direction, done by applying the arctangens function
            float result = fastAtan2(valueX,valueY);
            // Store in orientation matrix element
            orientation.at<float>(i,j) = result;
        }
    }

    return orientation;
}

Using this information, you can decide to calculate the average orientation for like a bin of 5x5 pixels easily. Hope this helps you out!