Research On Visual Comfort Evaluation Of Stereoscopic Contents Based On Color Asymmetry Information

Many people often feel discomfort when watching stereoscopic three-dimension(3D)display,and visual discomfort is also been described as the number one health problem in the stereoscopic display industry.There are many factors affecting the visual comfort of stereoscopic display,and there is no uniform standard for the evaluation of visual comfort of stereoscopic display.To find out the factors that affect visual discomfort and minimize or even eliminate its impact,it is necessary to evaluate the visual comfort of 3D display.The visual comfort of 3D contents is related to color information,and the three attributes of color include lightness,hue and saturation.In this paper,the following three evaluation experiments are carried out as well as the effect of color asymmetric information on the visual comfort of 3D display:(1)Evaluation of visual comfort for 3D contents based on lightness asymmetric information.We selected 6 stereoscopic images of natural images and computer-generated images as the references,and by manipulating the lightness asymmetry of 3D images in the CIE LAB color space,the visual comfort was measured subjectively at nine different lightness asymmetry levels.The results show,when the lightness asymmetry increases,the visual comfort decreases.Based on Weber–Fechner's Law,an objective mathematical model was fitted out,which predicts that the minimum dark difference for comfortable viewing is about 0.7 and the maximum lightness difference for comfortable viewing is about 1.2,it can provide guidance for stereoscopic images coding.(2)Evaluation of visual comfort for 3D contents based on hue asymmetric information.We also selected the above 6 stereoscopic images as the references,and by manipulating the hue asymmetry of 3D images in the CIE LAB color space,the visual comfort was measured subjectively at nine different hue asymmetry levels.The results show that with the increase of hue asymmetry,the visual comfort of the stereoscopic images gradually decreases.Based on Weber–Fechner's Law,an objective mathematical model was fitted out,the model predicts that the maximum value of hue difference for comfortable watching is about 76.3 degrees.This is a large tolerance range,and it provides the basis for the application that the surface appearance of an object can be simulated easily by using binocular color difference on 3D display devices.(3)Evaluation of visual comfort for 3D contents based on saturation asymmetric information.In the same way,we selected the above 6 stereoscopic images as references images,and by manipulating the saturation asymmetry of 3D images in the CIE LAB color space,the visual comfort was measured subjectively at nine different saturation asymmetry levels.Through our preliminary experiments,it was found that the saturation asymmetry has no effect on visual comfort of stereoscopic images.