Color Image Quality Assessment Based on CIEDE2000

Table 1

Subjective assessment metric based on CIEDE2000 Color difference.

𝑘	Δ𝐸min(𝑘)	Δ𝐸max(𝑘)	Perception of color difference	𝑄
1	0.0	0.5	Hardly	5
2	0.5	1.5	Slight	5−(Δ𝐸−0.5)
3	1.5	3.0	Noticeable	4−(Δ𝐸−1.5)/1.5
4	3.0	6.0	Appreciable	3−(Δ𝐸−3)/3
5	6.0	12.0	Much	2−(Δ𝐸−6)/6
6	12.0	24.0	Very much	1−(Δ𝐸−12)/12
7	24.0	∞	Strongly	0