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Dynamic defocus and occlusion compensation of projected imagery by model-based optimal projector selection in multi-projection environment

机译：在多投影环境中通过基于模型的最佳投影仪选择来对投影图像进行动态散焦和遮挡补偿

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This paper presents a novel model-based approach of dynamic defocus and occlusion compensation method in a multi-projection environment. Conventional defocus compensation research applies appearance-based method, which needs a point spread function (PSF) calibration when either position or orientation of an object to be projected is changed, thus cannot be applied to interactive applications in which the object dynamically moves. On the other hand, we propose a model-based method in which PSF and geometric calibrations are required only once in advance, and projector's PSF is computed online based on geometric relationship between the projector and the object without any additional calibrations. We propose to distinguish the oblique blur (loss of high-spatial-frequency components according to the incidence angle of the projection light) from the defocus blur and to introduce it to the PSF computation. For each part of the object surfaces, we select an optimal projector that preserves the largest amount of high-spatial-frequency components of the original image to realize defocus-free projection. The geometric relationship can also be used to eliminate the cast shadows of the projection images in multi-projection environment. Our method is particularly useful in the interactive systems because the movement of the object (consequently geometric relationship between each projector and the object) is usually measured by an attached tracking sensor. This paper describes details about the proposed approach and a prototype implementation. We performed two proof-of-concept experiments to show the feasibility of our approach.
机译：本文提出了一种在多投影环境下基于模型的动态散焦和遮挡补偿方法。传统的散焦补偿研究采用基于外观的方法，当要投影的对象的位置或方向发生更改时，需要点扩散函数（PSF）校准，因此不能应用于对象动态移动的交互式应用程序。另一方面，我们提出了一种基于模型的方法，其中只需要事先进行一次PSF和几何校准，并且无需任何其他校准即可基于投影仪和对象之间的几何关系在线计算投影仪的PSF。我们建议从散焦模糊中区分出倾斜的模糊（根据投影光的入射角，高空间频率分量的损失），并将其引入PSF计算。对于物体表面的每个部分，我们选择一个最佳的投影仪，该投影仪保留原始图像的最大数量的高空间频率分量，以实现无散焦的投影。几何关系也可用于消除多投影环境中投影图像的投射阴影。我们的方法在交互式系统中特别有用，因为对象的运动（因此，每个投影仪和对象之间的几何关系）通常由连接的跟踪传感器测量。本文介绍了有关建议的方法和原型实现的详细信息。我们进行了两个概念验证实验，以证明我们方法的可行性。

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