离轴柱幕投影图像几何校正技术研究

摘要

With the widely used in various areas of the projection and multi-projection technology in real life,the traditional projection technology only for a flat screen projection or orthographic projection has been far from practical applications to meet specific requirements of applied in real life.In the case of the projector off-axis installation,in order to eliminate the deformation of projected image,a nonlinear geometric correction method base grid image is proposed.This method used OpenCV to generate grid image,manually adjusted control feature points on grid image until grid image completely is embedded on cylindrical screen.According to the correspondence between feature points,the correction matrix is obtained,and finally,through the correction matrix projected image is corrected.The experiment shows that the method is simple,and can effectively eliminate the distortion of the image projected onto off-axis cylindrical screen,get a good visual effect.%随着投影以及多投影技术在现实生活中的广泛应用,传统的只针对平面幕或正投影的投影技术已经远远不能够满足现实应用中的特殊要求.在投影机离轴安装的情况下,为了消除投影图像的形变,提出了一种基于网格的非线性几何校正方法.使用OpenCV生成网格图像,通过手动调整网格图像上的控制特征点,使网格图像能够恰好完全镶嵌在投影柱幕上,根据特征点位置的对应关系,得到校正矩阵,最后,通过校正矩阵对投影图像进行校正.通过实验表明,该方法操作简便,可以有效地消除投影到离轴柱幕上图像的畸变,获得良好的视觉效果.