“…Facial bounding box is detected by the OpenCV implementation of the Viola-Jones face detector [32] applied to each frame. Regarding the works on ROIs selection [11,12], six ROIs are used in this paper: r = 1..6 ( (1), nose bridge (2), areas under eyes (3,4), truncated facial box (5), full bounding box (6). ROIs coordinates are not ideally symmetrical about a horizontal axis: they were set manually to match the facial features on most video sequences in the dataset.…”