Table 1.

Comparison of infrared thermography (IRT) and accelerometer (Acce.) measurements under various conditions.

Case	Normal	Dark	Hindered	Hazy
Max $f_1^{IRT}$ (Hz)	3.77	3.86	3.58	3.64
Average $f_1^{IRT}$ (Hz)	3.65	3.69	3.52	3.59
Min $f_1^{IRT}$ (Hz)	3.55	3.44	3.47	3.54
SD $f_1^{IRT}$	0.11	0.22	0.06	0.05
Max $f_1^{Acce}$ (Hz)	3.80	3.70	3.70	3.80
Average $f_1^{Acce}$ (Hz)	3.70	3.67	3.63	3.73
Min $f_1^{Acce}$ (Hz)	3.60	3.60	3.50	3.70
SD $f_1^{Acce}$	0.10	0.06	0.12	0.06
Error (%)	1.35	0.64	3.12	3.84
Average MAC	0.9963	0.9976	0.9803	0.9924