面向各向异性投影幕亮度一致性校正方法的研究

Research on the photometric uniformity correction method of the anisotropic projection screen

为了解决多投影机拼接融合显示系统中亮度分布不均匀及不同视角下的亮度差异问题,提出了一种多视角投影-摄像机系统的非线性最优化颜色校正方法,通过在多个位置放置摄像机进行多角度的观察,并对所有观察结果进行统一的优化处理,实现在各个方向上都能够满足要求的亮度调整方案。针对重叠区域高亮现象及重叠方向和形状的任意性问题,采用双三角函数法计算得到投影机的衰减矩阵,实现亮度融合。以双通道投影系统为实验平台验证了算法的可行性和有效性。

The performance of multi-projector display system is affected mainly by uneven projection screen brightness and anisotropic property of projection screen. A nonlinear optimization algorithm is proposed based on multi-view projector-camera system to solve these problems. By assigning different weights for each correction result, brightness differences of different view angles are balanced, and brightness adjustment is completed. For the overlapping region, double trigonometric function method is used to calculate the attenuation matrix of the projector. The light fusion is completed. Dual channel projection system is used to verify feasibility and effectiveness of the algorithm.