动态沙盘制作中逆数字微分纠正

Inverse Digital Differential Correction in DynamicSand Table Making

制作动态三维沙盘时,沙盘表面的地形表达一般由投影仪投射遥感影像完成。由于三维地形具有高低起伏的特点,对动态沙盘进行投影时,会出现影像局部偏移、影像无法准确匹配沙盘的情况。针对上述问题,本文提出了逆数字微分纠正技术,首先对投影仪的倾斜、偏位进行校正,然后提供了正解法和反解法两种解算方法,实现了正射影像到中心投影影像的转换,可解决投影时影像局部偏移和匹配精度差的问题。

When making dynamic 3D sand table,the terrain expression on the surface of the sand table is generally completed by projecting remote sensing images from a projector.Because the 3D terrain has the characteristics of ups and downs,when projecting the dynamic sand table,there will be local image offset and poor local matching accuracy between the image and the 3D terrain.In response to solve the above problems,this paper proposes an inverse digital differential correction technology,which first corrects the oblique and offset of the image,and then provides two solutions:forward solution and inverse solution,which realizes the conversion from the orthophoto image to the central projection image,and could solve the problems of local offset and poor matching accuracy of the image during projecting.