Table 1.

Detailed content of the performance test.

Error value	Concrete content
SE-V	Average static error of 5 test points without light under vertical observation
SE-O	Average static error of 5 test points without light under oblique observation (45°)
SE-H	Average static error of 5 test points without light under horizontal observation
SE-(V/O/H)-L	Average static error of 5 test points under low light intensity and the best observation angle
SE-(V/O/H)-M	Average static error of 5 test points under medium light intensity and the best observation angle
SE-(V/O/H)-H	Average static error of 5 test points under high light intensity and the best observation angle
SE-(V/O/H)-SH	Average static error of 5 test points under superhigh light intensity and the best observation angle
HE-(V/O/H)	Average head rotation error of 5 test points without light under the best observation angle
WE-(V/O/H)	Average walking error of 5 test points without light under the best observation angle