HCMUS at Pixel Privacy 2019: Scene Category Protection with Back Propagation and Image Enhancement. - Hung Vinh Tran; Trong-Thang Pham; Hai-Tuan Ho-Nguyen; Hoai-Lam Nguyen-Hy; Xuan-Vy Nguyen; Thang-Long Nguyen-Ho; Minh-Triet Tran (MediaEval, 2019)