视差是影响立体内容视觉舒适度的主要因素之一。结合视觉显著特性,通过大量主观实验研究视差因素对立体图像舒适度的影响,得到舒适视差的定量范围。首先,利用立体显著区域提取算法获得显著立体图像,并用眼动仪验证其合理性;然后,采用像素平移法对显著立体图像进行视差变换,得到实验素材,进行主观实验;最后,处理实验数据,得到舒适视差的定量范围。结果表明,人眼对水平视差和垂直视差的舒适度响应差异很大,水平视差舒适范围为(-0.379°,0.644°),而可接受的垂直视差范围为(-0.10°,0.11°)。验证实验的正确率在90%以上,表明所得舒适视差范围很好地反映了立体图像的主观舒适度,能为立体内容的制作提供更符合人眼视觉特性的定量标准。

Disparity is one of the main factors which affect the visual comfort of stereo content. Combined with the visual attention mechanism, the influence of disparity factor on visual comfort of three-dimensional (3D) image is studied through a large number of subjective experiments and a quantitative range is obtained. First, the salient stereo image is obtained through a stereo salient region extraction algorithm, and an eye tracker is used to verify its rationality. Then, the pixel shifting method is used for disparity conversion on the salient stereo image. A large number of subjective experiments are carried out with the converted images. Finally, the comfort disparity range is obtained after process of the experimental data. The experimental results show that the human visual system responds very differently to horizontal disparity and vertical disparity, and the comfortable range of horizontal disparity is (-0.379°,0.644°), while the comfortable range of vertical disparity is (-0.10°,0.11°). The correct rate of verification experiment is over 90%, which indicates the obtained comfortable disparity ranges reflect the comfort of stereo image well, and can provide a quantitative standard for the making of 3D contents.