基于新型色貌模型CAM16的颜色空间均匀性研究 
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Research on Color Space Uniformity Based on New Color Appearance Model CAM16
北京理工大学光电学院光电成像技术与系统教育部重点实验室, 北京 100081
图 & 表
图 1. 色貌颜色空间明度J与芒塞尔明度V的线性回归分析
Fig. 1. Linear regression analysis between color appearance color space lightness J and Munsell value V
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图 2. 明度V为5的芒塞尔颜色样本在色貌颜色空间Jab的分布。(a) CIECAM02模型的彩度圈分布图;(b) CAM16模型的彩度圈分布图
Fig. 2. Distribution of Munsell color sample with V of 5 in color appearance space Jab. (a) Chroma performance of CIECAM02 model; (b) chroma performance of CAM16 model
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图 3. 明度标尺J与ΔJ/ΔV的线性关系
Fig. 3. Linear relationship between brightness scale J and ΔJ/ΔV
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图 4. 彩度标尺C与ΔC/ΔV的线性关系
Fig. 4. Linearrelationship between chroma scale C and ΔC/ΔV
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表 1CIECAM02/CAM16的明度相关系数
Table1. Brightness correlation coefficient of CIECAM02/CAM16
| h | 5R | 5YR | 5Y | 5GY | 5G | 5BG | 5B | 5PB | 5P | 5RP |
|---|
| R2(CIECAM02) | 0.9954 | 0.9968 | 0.9863 | 0.9912 | 0.9967 | 0.9965 | 0.9967 | 0.9946 | 0.9779 | 0.9971 | | R2(CAM16) | 0.9954 | 0.9967 | 0.9862 | 0.9911 | 0.9967 | 0.9966 | 0.9969 | 0.9946 | 0.9784 | 0.9970 |
|
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表 2Jab空间各彩度圈偏离圆形的方均根误差
Table2. Root mean square errors of each chromatic circle deviating from the circle in Jab space
| Model | RMSE | STD |
|---|
| 1 | 2 | 4 | 6 | 8 | 10 | 12 |
|---|
| CIECAM02 | 1.3175 | 2.1171 | 2.9093 | 4.1734 | 4.3453 | 3.7516 | 4.0099 | 2.8786 | | CAM16 | 1.2780 | 2.0961 | 2.7771 | 3.7994 | 4.0617 | 3.5290 | 5.7325 | 3.0822 |
|
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表 3色相线的线性回归方均根误差
Table3. Root mean square error of linear regression of the hue lines
| h | 5R | 5YR | 5Y | 5GY | 5G |
|---|
| RMSE(CIECAM02) | 0.6646 | 0.5799 | 0.3455 | 0.2456 | 0.6258 | | RMSE (CAM16) | 0.6172 | 1.3307 | 0.2796 | 0.2577 | 1.2033 | | h | 5BG | 5B | 5PB | 5P | 5RP | | RMSE (CIECAM02) | 0.1670 | 0.8909 | 0.6386 | 1.4341 | 0.6142 | | RMSE (CAM16) | 0.1866 | 0.7284 | 1.9092 | 2.6120 | 1.1714 |
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表 4CAM16模型新明度标尺J'与J的比较
Table4. Comparison of new brightness scales J' and J of CAM16 model
| Brightness | R2 | RMSE |
|---|
| J | 0.96403 | 4.0698 | | J' | 0.97417 | 2.4904 |
|
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表 5各彩度圈偏离圆形的方均根误差
Table5. Root mean square error of chromatic circle deviating from the circle
| Model | RMSE | STD |
|---|
| 1 | 2 | 4 | 6 | 8 | 10 | 12 |
|---|
| Jab | 1.2780 | 2.0961 | 2.7771 | 3.7994 | 4.0617 | 3.5290 | 5.7325 | 3.0822 | | J'a'b' | 1.2325 | 1.7607 | 1.8869 | 2.1957 | 2.0746 | 1.6682 | 2.4123 | 2.6718 |
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表 6色相线的线性回归方均根误差
Table6. Root mean square error of linear regression of hue lines
| h | 5R | 5YR | 5Y | 5GY | 5G |
|---|
| RMSE(Jab) | 0.4973 | 1.1043 | 0.7632 | 0.5792 | 1.2962 | | RMSE(J'a'b') | 0.6646 | 0.5799 | 0.3455 | 0.2456 | 0.6258 | | h | 5BG | 5B | 5PB | 5P | 5RP | | RMSE(Jab) | 0.1974 | 0.8606 | 0.9757 | 2.3827 | 1.1240 | | RMSE(J'a'b') | 0.1670 | 0.8909 | 0.6386 | 1.4341 | 0.6142 |
|
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白雪琼, 廖宁放. 基于新型色貌模型CAM16的颜色空间均匀性研究[J]. 光学学报, 2020, 40(4): 0433001. Xueqiong Bai, Ningfang Liao. Research on Color Space Uniformity Based on New Color Appearance Model CAM16[J]. Acta Optica Sinica, 2020, 40(4): 0433001.
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