视差与空间频率对自由立体显示器观看舒适度的影响

Effects of parallax and spatial frequency on visual comfort in autostereoscopic display

观看舒适度是评价自由立体显示器性能的重要指标。立体图像的视差和空间频率影响人眼的感知深度,从而对观看舒适度有重要作用。本文采用3DS MAX三维建模软件和Photoshop图像处理软件得到不同视差和空间频率的立体图像,通过观看舒适度的客观度量结合主观评价确定视差及空间频率与观看舒适度的关系,得出观看舒适度较高时的视差范围和与之相对应的空间频率范围。实验表明,立体图像低空间频率所致的模糊可以增加观看舒适度。

Visual comfort is an important index of performance evaluation about autostereoscopic displays. Parallax and spatial frequency in stereo images are assumed to exert substantial influence upon perceiving depth of humafi eyes, thus having significant effect on visual comfort. In this paper, 3D modeling software 3D MAX and image processing software photoshop are used to get stereo images which contain different parallax and spatial frequency. Both objective evaluation and subjective evaluation are adopted to assess comfort degree of the viewers, the relationship between parallax as well as spatial frequency and visual comfort is confirmed. In the case of comfortable viewing, parallax range and the corresponding spatial frequency scope are obtained. According to the experimental results, blur caused by low spatial frequency can improve visual comfort in stereo images.