“…One study reported 16 stationary positioned cameras at a 'bird's eye view' (Montoliu et al, 2015), andÓ Conaire et al (2010) reported the use of one overhead and 8 stationary cameras around a tennis court baseline, although data from two cameras were only used in final analysis due to occlusion issues. Sample frequency and, or pixel resolution were reported in seven of the studies (Couceiro et al, 2013;Hachaj et al, 2015;Kasiri-Bidhendi et al, 2015;Kasiri et al, 2017;Montoliu et al, 2015;Victor et al, 2017;Zhu et al, 2006), with sample frequencies ranging from 30 Hz to 210 Hz. Buckley et al, 2017;Buthe et al, 2016;Groh et al, 2016Groh et al, , 2017Groh et al, , 2015Jensen et al, 2016;Kautz et al, 2017;Kelly et al, 2012;Ó Conaire et al, 2010;Pernek et al, 2015;Salman et al, 2017;Schuldhaus et al, 2015;Whiteside et al, 2017).…”