- •4 Color appearance models
- •4.1 General requirements for color appearance models
- •4.2 Cielab Model
- •Inverse conversion equations
- •4.3 Cieluv Model
- •Inverse conversion equations
- •4.4 Ciecam02 Model
- •Categorical viewing conditions settings for the model
- •Unique hue data for the calculation of hue quadrature
- •Inverse conversion equations
- •4.5 Modification of ciecam02 by Luo et al.
- •Table 4.1
- •Values of lightness for spectral colours
- •Table 4.2
- •Values of colorfulness for spectral colours
- •Table 4.2 (End)
- •Table 4.3 Values of criterion
- •Table 4.4 (End)
- •Таble 4.7 Values of distance between position of points of monochromatic colors of chromaticity diagram for combined adapting luminance and surround for stimulus luminance, equal 10 cd/m2
- •Table 4.9 Values of distance between position of points of monochromatic colors of chromaticity diagram for stimulus luminance, equal 20 и 200 cd/m2 for stimulus luminance, equal 50 cd/m2
- •Table 4.11 Values of distance between position of points of monochromatic colors of chromaticity diagram for combined adapting luminance and surround for stimulus luminance, equal 50 cd/m2
- •Table 4.12
- •Figure 4.19 ‒ Occurrence of image impairment in dependence of colour deflection levels
- •4.6 High-Luminance Color Appearance Model
- •Inverse model computation:
Table 4.4 (End)
Surround |
LA. cd/m2 |
|
|||||
700 |
W |
||||||
|
|
|
|
|
|
||
average |
20 |
54.87 |
32.62 |
44.89 |
‒1.00 |
‒0.59 |
1.18 |
200 |
60.65 |
36.61 |
45.26 |
‒0.21 |
‒0.12 |
0.24 |
|
dim |
20 |
54.55 |
32.15 |
51.10 |
‒1.52 |
‒0.90 |
1.81 |
200 |
60.31 |
36.10 |
51.44 |
‒1.03 |
‒0.61 |
1.22 |
|
dark |
20 |
53.09 |
30.99 |
55.46 |
‒1.13 |
‒1.14 |
2.30 |
200 |
58.79 |
34.86 |
55.77 |
‒1.69 |
‒1.00 |
2.01 |
|
TABLE
4.5
Values of distance
between position of points of monochromatic
colors of
chromaticity diagram for the values of adapting lightness
,
equal
20 and 200 cd/m2, for stimulus
luminance, equal to 10 cd/m2
Surround |
|
||||||
380 |
485 |
495 |
515 |
550 |
580 |
700 |
|
average |
7.50 |
5.68 |
5.57 |
5.80 |
5.82 |
5.72 |
7.03 |
dim |
7.26 |
5.70 |
5.58 |
5.82 |
5.82 |
5.63 |
6.99 |
dark |
7.02 |
5.63 |
5.50 |
5.72 |
5.74 |
5.47 |
6.89 |
TABLE
4.6
Values of distance
between
position of points of monochromatic colors
of chromaticity
diagram for average and dim surround for the values of adapting
lightness
,
equal 20 and 200 cd/m2, for stimulus luminance, equal to 10 cd/m2
|
|
||||||
380 |
485 |
495 |
515 |
550 |
580 |
700 |
|
20 |
7.83 |
6.73 |
6.69 |
6.65 |
6.58 |
6.48 |
6.24 |
200 |
8.41 |
6.74 |
6.70 |
6.65 |
6.57 |
6.47 |
6.21 |
Таble 4.7 Values of distance between position of points of monochromatic colors of chromaticity diagram for combined adapting luminance and surround for stimulus luminance, equal 10 cd/m2
Conditions
of viewing
(adapting luminance
|
|
||||||
380 |
485 |
495 |
515 |
550 |
580 |
700 |
|
|
12.39 |
8.51 |
8.4 |
8.51 |
8.53 |
8.59 |
9.55 |
– average – dark |
18.16 |
13.18 |
13.01 |
13.07 |
13.02 |
13.02 |
13.89 |
|
9.34 |
9.12 |
9.01 |
9.15 |
9.03 |
8.63 |
9.12 |
TABLE 4.8 Colour coordinates of monochromatic colour points of chromaticity diagram for Y=50
Surround |
LA, cd/m2 |
|
||||||||
380 |
485 |
495 |
||||||||
|
|
|
|
|
|
|
|
|
||
average |
20 |
49.29 |
‒65.84 |
75.23 |
‒49.95 |
‒29.39 |
70.29 |
‒55.90 |
‒7.51 |
71.60 |
200 |
56.64 |
‒69.14 |
71.90 |
‒55.49 |
‒32.30 |
70.32 |
‒61.97 |
‒8.17 |
71.70 |
|
dim |
20 |
46.59 |
‒64.77 |
80.30 |
‒48.42 |
‒28.59 |
74.39 |
‒54.17 |
‒7.37 |
75.50 |
200 |
53.16 |
‒68.70 |
77.99 |
‒53.88 |
‒31.48 |
74.42 |
‒60.16 |
‒8.05 |
75.59 |
|
dark |
20 |
43.59 |
‒62.81 |
83.75 |
‒46.24 |
‒27.39 |
77.13 |
‒51.72 |
‒7.12 |
78.10 |
200 |
49.50 |
‒67.12 |
82.06 |
‒51.58 |
‒30.25 |
77.18 |
‒57.58 |
‒7.81 |
78.19 |
|
Surround |
LA, cd/m2 |
|
||||||||
515 |
550 |
580 |
||||||||
|
|
|
|
|
|
|
|
|
||
average |
20 |
‒55.56 |
23.54 |
73.02 |
‒38.31 |
44.81 |
75.85 |
‒1.24 |
51.51 |
79.52 |
200 |
‒61.22 |
26.26 |
73.16 |
‒42.02 |
49.99 |
76.02 |
‒1.17 |
57.95 |
79.72 |
|
dim |
20 |
‒53.93 |
22.69 |
76.72 |
‒37.24 |
43.16 |
79.16 |
‒1.44 |
49.30 |
82.34 |
200 |
‒59.53 |
25.34 |
76.84 |
‒40.96 |
48.21 |
79.31 |
‒1.42 |
55.54 |
82.51 |
|
dark |
20 |
‒51.62 |
21.57 |
79.17 |
‒35.73 |
41.02 |
81.36 |
‒1.61 |
46.58 |
84.19 |
200 |
‒57.14 |
24.13 |
79.29 |
‒39.44 |
45.91 |
81.50 |
‒1.64 |
52.59 |
84.34 |
|
Surround |
LA, cd/m2 |
|
|||||
700 |
W |
||||||
|
|
|
|
|
|
||
average |
20 |
68,26 |
41,09 |
86,05 |
‒1,55 |
‒0,92 |
1,85 |
200 |
74,04 |
45,48 |
86,30 |
‒0,32 |
‒0,19 |
0,38 |
|
dim |
20 |
65,93 |
39,35 |
87,92 |
‒2,21 |
‒1,31 |
2,65 |
200 |
71,65 |
43,64 |
88,12 |
‒1,49 |
‒0,89 |
1,77 |
|
dark |
20 |
63,09 |
37,29 |
89,13 |
‒2,68 |
‒1,58 |
3,23 |
200 |
68,75 |
41,48 |
89,30 |
‒2,33 |
‒1,38 |
2,80 |
|
