自由立体显示器的再现立体深度与视差图的视差大小有关系,而视差的大小与获取视差图时相机摆放方式密切相关。本文采用平行结构放置相机,通过设置相机间距使得拍摄到的视差图在相对平移后某一深度物点具有零视差,而另一深度物点具有所期望的视差。视差大小体现了再现立体深度大小,从而得到再现立体深度与相机间距间的定量关系。通过实验验证了推出关系的正确性。该研究结果可用于指导拍摄立体影像时相机的摆放,便于获得适当的视差图以达到最佳的立体显示效果。

In stereoscopic displays, stereo depth is associated with parallax in parallax image, and parallax is related with the layout of cameras when the parallax images are captured. In the paper, these cameras are laid in parallel configuration. By setting proper distance between cameras and shifting the images reasonably, the objects with a certain depth have zero parallax and the objects with other depth have expected parallax. The parallaxes correspond to different stereo depths, so the quantitative relationship between stereo depth and distance of two cameras for capturing the parallax images is obtained. An experiment is carried out to verify the theory, the results show that proposed quatitative relationship can help to take good parallax images for stereoscopic displays by laying out cameras suitably.