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中文摘要：
本文提出一种基于反向条纹投影原理的数字地球仪。在数字地球仪中,显示屏是一个球面的漫反射屏,通过投影的方法可以实现数字地球仪任意方向的旋转显示。首先通过投影正弦条纹到球面显示屏上,从观察数字地球仪的方向用CCD相机获取变形条纹图像,通过相移算法,建立投影器和摄像机像素之间的几何传递关系。基于地球三维图形信息数据库,根据期望图像为投影器产生投影图像。本文建立了地球三维信息提取模型,可快速获取从任意角度观察地球的图形信息。实验使用一半径为25cm的漫反射球体作为显示屏,将计算得到反向地图投影其上,得到相当好的实验结果。
英文摘要：
A digital globe based on the inverse fringe projection is presented. In the digital globe, the display screen is a spherical surface of the diffuse reflection screen and through the method of projection, digital globe rotating display in any direction can be achieved. First of all, sinusoidal fringes are projected to the spherical screen. Then, from the direction of observing globe, the digital CCD camera is used to obtain deformation fringe images. Through the phase-shifting algorithm, we can establish the transmission geometry between the projector and camera pixels. The inverse projected images for projector can be generated according to the expected images, which come from the 3D Earth graphics information database. 3D information extraction model of the Earth is established to quickly acquire Earth＇s graphics information in any observation point. In the experiment, the calculated inverse map is projected onto a spherical surface with the diffuse reflection screen,whose the radius is 25 cm. The experimental results are quite satisfactory.
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