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基于相机的多投影光度补偿系统

刘一然,杨旭波(上海交通大学计算机科学与工程系,上海 200240;智能计算与智能系统教育部-微软重点实验室,上海 200240;上海交通大学软件学院,上海 200240)

摘 要
现有关于光度补偿的研究主要基于单投影,可在带有纹理和颜色的表面上进行投影显示。而在多投影系统中,由于多投影带来了重叠区域的光度不一致性,相机的每个像素覆盖的区域增大等问题,容易致使光度补偿失败。介绍一种基于相机的多投影光度补偿系统,虽然也是通过获取环境参数的手段,但提出一种方便快捷的迭代方式来提高投影表面反射率参数的获取精度,可以达到更好的效果,并仅需对投影区域捕捉两幅以上图像。同时,对多投影仪重叠区域的融合效果也做了改进,统一解决了光度补偿和投影拼接问题。最后,提供的实验结果表明有较好的改进效果。
关键词
Camera-based multi-projector radiometric compensation system

Liu Yi Ran,Yang Xubo(Shanghai Jiao Tong University)

Abstract
Single projector radiometric compensation technique has made it possible for a projector to display on ordinary surface with colors and textures. However, when applying these methods to multi-projectors, many issues will happen,including the inconsistence in intensity of the overlapping areas, region expansion of a single pixel, all of which will lead to failure of the compensation. This paper presents a multi-projector and camera system with the ability of geometry correction, radiometric compensation and photometric consistency and solves the problems as mentioned. We use a convenient and iterative way to obtain more precise parameter of the reflection property for the projecting surface. This only considers two or more pictures of the projecting-surface, so that it can provide much better compensation results. We also improve the blending effects of the overlapped areas of multi-projectors and thus provide a unified solution for radiometric compensation and photometric inconsistency when displaying on non-optimized surfaces with multi-projectors. Experiments indicate the improvements of the new method compared to the original algorithm.
Keywords
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