提出了一种基于高度信息的自由曲面可编辑投影显示技术。利用基于条纹投影的平面标定技术,建立了测量范围内的相位-高度映射表;采用高精度相移技术和三频时间相位展开方法,获得了自由曲面的水平和垂直相位分布信息;利用反向条纹投影技术建立了投影仪像素与相机像素间的几何及强度传递关系。利用该显示技术可在曲面上投影基于其高度信息的预期编码图像,实现高度信息的可编辑投影和三维显示。给出了在自由曲面上投影等高线和伪彩色编码、冰川雪线变化的动态过程及仿真实体添加等实例。

An editable projection display technology of free-form surfaces based on height information is proposed. The plane calibration technology based on fringes projection is used to establish the phase-height mapping table within the measurement range. The horizontal phase and vertical phase distributions on the free-form surface can be obtained by using the high-precision phase-shifting technique and the three-frequency temporal-phase unwrapping method. The geometry and intensity transfer relations between the projector pixels and the CCD camera pixels are established by the inverse fringe projection technology. By this display technique, the expected encoded image based on its height information can be projected on the free-form surface to realize an editable projection of high information and a 3D display. Some examples, such as the contour and the pseudo-color encoding projection on free-form surfaces the dynamic projection of glacier snowline variation and the add of simulation entities are given.