增强现实技术将计算机生成的虚拟物体实时叠加到用户周围的真实场景中, 虚拟物体与真实环境拥有一致的光照效果是该技术的难点之一. 光照一致性研究包括光照估计、材质表面反射属性估计以及真实感渲染等内容, 其中光照估计是光照一致性的先决条件, 结合材质表面反射属性可以保证虚实物体一致的光照渲染效果. 文中概述了增强现实中光照一致性研究的最新进展, 通过分析现有技术的优缺点阐述了当前光照估计研究所面临的主要挑战,同时展望了该领域未来的发展方向.%In an augmented reality system virtual objects generated by computer are superimposed on the real scene around users, therefore the illumination consistency between virtual objects and real surroundings is one of the key problems. Existing researches on illumination consistency include illumination estimation, material sur-face reflectance estimation, photorealistic rendering and so on. The illumination estimation is the prerequisite of illumination consistency and guarantees the consistence of illuminations between virtual and real objects while combining with material surface reflectance estimation. This paper summarizes the most recent research pro-gresses on illumination consistency in augmented reality, discusses the main challenges by analyzing the advan-tages and shortcomings of existing techniques, and predicts the future trends of the illumination estimation in augmented reality.
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