多投影显示系统结构光几何校正算法

摘要

Aiming at geometric calioration for multi-projector display system witj irregular curved display wall,a nonlinear auto-geometric calibration algorithm based on structured light projection technique is proposed.Firstly,the mapping relation between every projector and the display wall is calculated using structured light projection technique.Secondly,a camera is used to capture longitude and latitude spot-array on the display wall.Thirdly,the longitude and latitude value in global coordinate for each pixel on the projector frame buffer is calculated by extracting the features in images captured by the camera.Finally,the geometric calibration is achieved by changing the longitude and latitude value to texture coordinate.Both computer simulation experiments and real applications in virtual airport system showed that the proposed algorithm provided high calibration accuracy.Furthermore,since the proposed algorithm does not require the calibration of camera and any prior knowledge of the display,it is suitable for any smooth display walls.%针对带有非规则曲面显示墙的多投影显示系统的几何校正问题,提出一种基于结构光投影技术的自动非线性几何校正算法.该算法首先用结构光投影技术计算出每个投影机与显示墙的映射关系；其次使用相机拍摄显示墙上的经纬度点阵；最后通过提取拍摄的图像特征计算得到投影机帧缓存中每个像素点在全局坐标系下的经纬度值,并将其转换为纹理坐标,从而实现了非线性几何校正.模拟仿真实验和虚拟机场系统中的实际应用结果表明,文中算法能够有效地提高系统的几何校正精度,且无需进行相机的标定和具有显示墙解析式的先验知识,适用于任意光滑的曲面显示墙.