Zhang, Xueli; Dai, Longquan: 'Fast bilateral filtering', Electronics Letters, 2018, DOI: 10.1049/el.2018.7278 IET Digital Library, https://digital-library.theiet.org/;jsessionid=7bddgjdbcfa8b.x-iet-live-01content/journals/10.1049/el.2018.7278