3D纸基模型表面亮度预测研究

Research on Luminance Prediction of 3D Paper-based Model Surface

纸基模型表面亮度感知是整体色貌感知的重要组成,亮度感知的准确性、快捷性直接影响到纸基模型整体外貌的视觉感知。本文通过对3D纸基模型表面亮度测量,实现3D纸基表面在不同角度、不同阶调时的亮度预测。首先,通过设计的纸模测量角度架,可以方便快捷地调整纸基表面角度,然后,确定测量角度取样间隔为5°,纸模表面角度为5°~85°,依次测量,最后,设计四色表面梯尺,青色、品色、黄色、黑色在不同纸基表面和不同阶调下,利用辐射亮度计对其表面亮度值进行测量。利用最小二乘法建立亮度与纸基表面角度、阶调之间的关系模型,并对模型优劣程度进行检验。结果表明,本预测模型可以快速准确地对任意角度3D纸基表面进行亮度预测,获取3D纸基模型表面的亮度。

The surface luminance perception is one of the most important aspects of achieving an overall appearance for a paper-based model.The accuracy and rapidity of luminance perception directly affect the visual perception of the overall appearace of the paper-based model.In this paper,the surface luminance prediction based different surface set angles and surface tone values was performed by measuring the surface luminance of 3D paper-based model.First,a rotating bracket was designed to facilitate to set the paper surface angle.Then,we set the angle from 0 to 85°at the interval of 5°using the designed rotating bracket.In addition,the four primary color scales,cyan,magenta,yellow,and black,were printed and set at the designed angle.The angle-ware and tone-ware luminance was measured using spectroradiometer,CS-2000.Finally,we proposed and evaluated a mathematical model to reveal the relationship between luminance and surface set angles and surface tones using the least squares polynomial method.The results indicated that the surface luminance of 3D paper-based model could be predicted and obtained quickly and accurately for any surface set angles and surface tone values by the proposed prediction model.