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Hi guys. As I promised on my last comment, here is the solution that I found (as I said, I don't think that is a elegant solution, but it works):

 Mat rotate_landmarks(Mat &src) {
    Mat dst = src.clone();

    Point2f l = get_left_eye_centroid(src);
    Point2f r = get_right_eye_centroid(src);

    Point2f center(
                   (r.x - l.x) / 2,
                   (r.y - l.y) / 2
                   );

    Mat rot = getRotationMatrix2D(center, get_alignment_angle(src), 1);

    double angle_cos = rot.at<double>(0,0);
    double angle_sin = rot.at<double>(1,0);

    for (int i = 0; i <= 66; i++) {

        double x = src.row(0).at<float>(i);
        double y = src.row(1).at<float>(i);

        dst.row(0).at<float>(i) = (x*angle_cos) - (y*angle_sin);
        dst.row(1).at<float>(i) = (y*angle_cos) + (x*angle_sin);

    }

    return dst;
}

I'm applying the rotation for each point, using:

        dst.row(0).at<float>(i) = (x*angle_cos) - (y*angle_sin);
        dst.row(1).at<float>(i) = (y*angle_cos) + (x*angle_sin);

I actually don't like this solution very much because I'm generating the rotationMatrix2D but it is not being used directly, that's because i'm not working with a conventional image matrix.

If someone have any solution that uses the rotationMatrix directly please add the answer to this topic and I probably will mark it as the best answer.

Thank to everyone that helped.

Hi guys. As I promised on my last comment, here is the solution that I found (as I said, I don't think that is a elegant solution, but it works):

 Mat rotate_landmarks(Mat &src) {
    Mat dst = src.clone();

    Point2f l = get_left_eye_centroid(src);
    Point2f r = get_right_eye_centroid(src);

    Point2f center(
                   (r.x - l.x) / 2,
                   (r.y - l.y) / 2
                   );

    Mat rot = getRotationMatrix2D(center, get_alignment_angle(src), 1);

    double angle_cos = rot.at<double>(0,0);
    double angle_sin = rot.at<double>(1,0);

    for (int i = 0; i <= 66; i++) {

        double x = src.row(0).at<float>(i);
        double y = src.row(1).at<float>(i);

        dst.row(0).at<float>(i) = (x*angle_cos) - (y*angle_sin);
        dst.row(1).at<float>(i) = (y*angle_cos) + (x*angle_sin);

    }

    return dst;
}

I'm applying the rotation for each point, using:

        dst.row(0).at<float>(i) = (x*angle_cos) - (y*angle_sin);
        dst.row(1).at<float>(i) = (y*angle_cos) + (x*angle_sin);

I actually don't like this solution very much because I'm generating the rotationMatrix2D but it is not being used directly, that's because i'm not working with a conventional image matrix.

If someone have any solution that uses the rotationMatrix directly please add the answer to this topic and I probably will mark it as the best answer.

Thank to everyone that helped.

Hi guys. As I promised on my last comment, here is the solution that I found (as I said, I don't think that is a elegant solution, but it works):

 Mat rotate_landmarks(Mat &src) {
    Mat dst = src.clone();

    Point2f l = get_left_eye_centroid(src);
    Point2f r = get_right_eye_centroid(src);

    Point2f center(
                   (r.x - + l.x) / 2,
                   (r.y - + l.y) / 2
                   );

    Mat rot = getRotationMatrix2D(center, get_alignment_angle(src), 1);

    double angle_cos = rot.at<double>(0,0);
    double angle_sin = rot.at<double>(1,0);

    for (int i = 0; i <= 66; i++) {

        double x = src.row(0).at<float>(i);
        double y = src.row(1).at<float>(i);

        dst.row(0).at<float>(i) = (x*angle_cos) - (y*angle_sin);
        dst.row(1).at<float>(i) = (y*angle_cos) + (x*angle_sin);

    }

    return dst;
}

I'm applying the rotation for each point, using:

        dst.row(0).at<float>(i) = (x*angle_cos) - (y*angle_sin);
        dst.row(1).at<float>(i) = (y*angle_cos) + (x*angle_sin);

I actually don't like this solution very much because I'm generating the rotationMatrix2D but it is not being used directly, that's because i'm not working with a conventional image matrix.

If someone have any solution that uses the rotationMatrix directly please add the answer to this topic and I probably will mark it as the best answer.

Thank to everyone that helped.