Vision-Based Interfaces for Character-Based Text Entry: Comparison of Errors and Error Correction Properties of Eye Typing and Head Typing

Table 3

Length of the transcribed text and error-free performance.

	Session 1	Session 2	Session 3
Eye typing
Total phrase count	384	501	513
Total word count	2170	2863	2937
Average words per participant	68 ± 5, SD = 30	93 ± 6, SD = 31.5	105 ± 8, SD = 40
Error-free phrase count	320 (83%)	443 (88%)	465 (90%)
Total error-free word count	1794	2503	2666
Average error-free words per participant	56 ± 6, SD = 33	81 ± 6, SD = 35	95 ± 8, SD = 42
Head typing
Total phrase count	179	234	244
Total word count	1022	1322	1438
Average words per participant	33 ± 2, SD = 10	44 ± 2, SD = 10	48 ± 2, SD = 12
Error-free phrase count	163 (91%)	219 (94%)	229 (93%)
Total error-free word count	928	1231	1338
Average error-free words per participant	30 ± 2, SD = 12	41 ± 2, SD = 11	45 ± 2.5, SD = 14