Image and Graphics Technologies and Applications 14th Conference on Image and Graphics Technologies and Applications, IGTA 2019, Beijing, China, April 19-20, 2019, Revised Selected Papers - Wang, Yongtian; Wang, Yongtian; Huang, Qingmin; Huang, Qingmin; Peng, Yuxin; Peng, Yuxin (Springer Singapore : Imprint: Springer, 2019)