Table 9. Videos without PDR auxiliary module.

Video	System without PDR auxiliary system in classroom
	$Frame\mathrm{\_}num$	$Center\mathrm{\_}num$	$In\mathrm{\_}num$	$Center\mathrm{\_}rate\left(\mathrm{\%}\right)$	$In\mathrm{\_}rate\left(\mathrm{\%}\right)$
Video1	1,300	635	785	48.89	60.39
Viedo2	1,890	860	1,100	45.87	58.20
Video3	2,080	990	1,240	49.09	59.62
Video4	2,445	1,155	1,425	45.67	58.28
Video5	1,875	875	1,130	47.08	60.27
Video6	2,075	945	1,235	45.48	59.52
Average	1,944	910	1,152	47.01	59.38