CAJ | 학술논문

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25 cm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.
본문제출일충기우반향조문투영원리적수자지구의.재수자지구의중,현시병시일개구면적만반사병,통과투영적방법가이실현수자지구의임의방향적선전현시.수선통과투영정현조문도구면현시병상,종관찰수자지구의적방향용CCD상궤획취변형조문도상,통과상이산법,건립투영기화섭상궤상소지간적궤하전체관계.기우지구삼유도형신식수거고,근거기망도상위투영기산생투영도상.본문건립료지구삼유신식제취모형,가쾌속획취종임의각도관찰지구적도형신식.실험사용일반경위25 cm적만반사구체작위현시병,장계산득도반향지도투영기상,득도상당호적실험결과.
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 fiinges 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.