平行式三维立体成像效果的优化研究

Study on optimization of three-dimensional stereo imaging based on parallel camera configuration

针对平行式三维成像技术由于自身成像机理的限制,使得拍摄获取的水平视差恒为负数,导致三维再现景象只能凸出屏幕显示,且三维再现与真实景象之间无法保持线性并存在三维畸变等问题。本文在建立数学模型详细分析上述问题产生的原因、特点及影响的基础上,提出了产生水平正视差和实现线性消畸变的方案,并分别对这两种方案中的舒适区域范围及各自对系统参数要求进行了深入研究。选用752×582分辨率的CCD,在自行研制的640×480@120 Hz系统上对设计的方法进行测试与验证,实验结果证实了同时产生水平正负视差和实现线性消畸变的可行性及合理性,对实际设计不同应用场合的三维立体显示系统有很好的指导意义。

Parallel three-dimensional （3D） imaging technique has been widely applied due to its simple configuration and non-vertical parallax. However, the horizontal parallax obtained is invariably negative due to the limitations of the imaging mechanism.As a result,the 3D reproduction of the scene can only be displayed in＇ front of the screen,and the comfortable area behind the screen can not be fullyutilized. Moreover, the conversion from the real scene to the stereoscopic images cannot be linear for the parallel camera configuration and then the stereoscopic distortions always exist. Therefore, based on the detailed analysis of the causes, characteristics and impact of the above-mentioned problems using a mathematical model, the horizontal positive parallax production and linear distortions elimination schemes are proposed in this paper. The comfortable area and their requirements on the system parameters of the two proposed methods are studied respectively. The proposed method is tested and verified on the self-developed sys- tem of 640）〈 480 at 120 Hz with selection of the CCD resolutions to 752 X 582. The experimental results confirm the feasibility and rationality of the production of horizontal positive parallax and horizontal neg- ative parallax at the same time and linear distortions elimination. It provides a new direction for the actu- al design of the different applications of the 3D display system.