Table 1.

Camera specification and image acquisition parameters.

Name	Description
Image acquisition device name	Canon Power Shot SX530 HS
Weather	Daylight, rainy, sunny, cloudy
Capturing period	8 a.m. to 6 p.m.
Background	Complex; not fixed
Horizontal field-of-view	Approximately 75${}^{°}$
Image dimension	4608 × 3456
Maximum capturing distance	60 m
Street sign condition	Standard, non-standard
Total number of characters	16 (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, J, L, N, /)
Number of characters acquired per class	300
Total number of character acquired	4800
Total number of training samples	3200
Total number of testing samples	1600