面向VDT显示界面的视觉舒适度客观描述方法

An objective description method of visual comfort for VDT display interface

通过主、客观实验相结合的方法对面向视觉显示终端(VDT)的信息显示界面视觉舒适度的客观描述模型进行研究。以不同色彩组合的仪表界面为测试对象,采集被试者的脑电信号,得到P100和P300幅值、潜伏期以及各频段下的脑波能量P,并对表盘界面进行舒适度主观评分。利用多项式拟合回归,建立视觉舒适度(VC)与FP4和β波能量Pβ之间的数学模型。研究结果表明:通过相关性分析,得到视觉舒适度分别与顶叶P4处的P300幅值FP4(相关系数为0.644,显著性ρ<0.05)、β波能量Pβ(相关系数为0.850,ρ<0.005)及比值P(α+θ)/β(相关系数为-0.872,ρ<0.005)均显著相关。模型显示视觉舒适度与FP4呈正向线性关系,与Pβ呈二次抛物线关系,二者的交互作用与视觉舒适度呈负相关关系。利用该数学模型对视觉舒适度进行客观描述是可行的,同时该模型可用于对VDT视觉显示界面视觉舒适度的评价。

An objective description model was established by a combination of subjective and objective approaches. The test objects were the instrument interfaces with different color combinations. Through collecting electroencephalogram EEG signals of subjects, the amplitude and latency of P 100 and P300 induced by different combinations were obtained, as well as EEG power under different bands. A subjective evaluation was carried out after the objective tests. Through the polynomial regression firing, a mathematical model of visual comfort （VC） was established with Fp4 and Pβ as independent variables. The results show that through correlation analysis, the highly relevant relationships are found among the visual comfort and P300 amplitude at the parietal lobe （P4） Fp4 （correlation coefficient of 0.644, significance p 〈0.05）, β band power Pβ （correlation coefficient of 0.850, p〈0.005） and the rate of β/（α＋θ） P（α＋θ）β （correlation coefficient of-0.872, p〈0.005）. The relationship between VC and Fp4 is positive linear and the relationship between VC and Pβ is quadratic parabola, and a negative relation is found between VC and the interaction of Fp4 and Pβ. It is feasible to use this model for the objective evaluation of visual comfort. Meanwhile, this model can be used to evaluate the visual comfort of VDT display interface.