Table 1

Haze-degree	Corresponding ω¯	Standards
Haze-degree	Corresponding ω¯	Haze area proportion	Haze density
0	0.1	0	clear
1	0.3	0 − 80%	thin
2	0.5	0 − 80%	normal or thick
3	0.7	80% − 100%	thin
4	0.8	80% − 100%	normal
5	0.9	80% − 100%	thick

Table 1: Standards dividing images into six groups.