相位调制潜像对图像呈色效果的影响

Influence of Phase Modulation Latent Image on Color Rendering

相位调制法通过对局部网点进行位移形成潜像以达到仿伪目的,而潜像网点空间位置变化会对图像呈色效果产生影响。通过探索相位调制方案给网点空间分布带来的变化,分析潜像对图像呈色属性的影响。运用相位调制法中的最小位置变换和中心位置变换模型,量化得到因网点位移而对网点分布带来的局部变化量,并以此分析网点分布变化与密度变化对网点呈色效应的影响。结果表明,相位调制潜像法重置网点位置,不同网点排布状态及密度下的颜色属性发生变化,影响了图像呈色效果。因此,合理化相位调制方案是图像色彩再现的有力保障,可为防伪图像质量相关研究提供有价值的理论依据。

The phase modulation method forms a latent image by displacing the local dot to achieve anticounterfeiting purposes,but the changes of the spatial position would affect the color rendering.The influence mechanism of the hidden image on the color attribute is analyzed by exploring the changes in the spatial distribution.Based on the minimum position transformation and center position transformation model in phase modulation,the local variation caused by dot displacement is quantified,and the influence of dot distribution and density on dot color rendering are analyzed.The results show that the phase modulation latent image method resets the location of dots,and the color attributes of different dot distributions and density change accordingly,which affects the image color rendering.Therefore,the rationalized phase modulation scheme is a powerful guarantee for the color reproduction,and can provide a valuable theoretical basis for the study of anti-counterfeit image quality.