左右视图不协调是影响立体显示舒适度的重要因素之一, 色度偏差是不协调性的重要指标之一。ERP(event-relation-potentials),即事件相关电位, 与特定的物理事件或心理事件在时间上相关的电压波动, 通过叠加技术从EEG(electroencephalography)中提取的信号。ERP时间分辨率高、客观性强, 能够客观地实时地反应人类心理活动, 可以用于舒适度方面的客观评价。本文结合行为数据分析和ERP分析, 从色度偏差指标研究左右视图不协调在立体显示舒适度方面的影响。研究结果表明, 色度偏差可在大脑皮层诱发可测ERP信号, 色度偏差在20°以内被试感觉不到明显的不协调, 偏差等级越大, 被试的不协调感越强烈。ERP分析结果与行为数据分析结果相符一致, 说明ERP可以用来评价色度偏差产生的左右视图不协调对立体显示舒适度的影响。

Incongruity between two viewpoints is one of the important factors that affect visual comfort of 3D display, of which hue distortion is an important item. ERP, the event-relation-potentials, is a voltage fluctuation related to a specific physical or mental event in the time domain, and it is one type of average electroencephalogram signals extracted from EEG (electroencephalography) signals which are evoked by external stimulating signals via utilizing overlay techniques. ERP is of high temporal resolution and objective existence, and it can reflect the human being mental activities objectively and simultaneously, and it may be used as the objective evaluation on visual comfort. In this paper, the hue distortion and the correlation between incongruity and visual comfort of 3D display are discussed and studied respectively. As a result, it is found that subjects can′t perceive obvious incongruity as the hue distortion remains in 20° and the perception of incongruity or discomfort increases as the level of distortion rising up, and hue distortion does elicit measurable ERP signals on cerebral cortex. The results of ERP analysis are highly correlated with those of behavioral data, indicating that ERP can be used to assess the effects of hue distortion on visual comfort.