基于图像的光照模型的研究与实现

Study of image-based illumination model and its implementation

为了把计算机生成的虚拟物体更好地融入真实场景的实拍照片中,实现光照一致性的效果,提出了一个基于图像的光照模型,它使用光测图作为光源从而实现对场景的照明。在研究基于图像的局部光照模型时,又提出了双向折射率分布函数这一概念,从而简化了局部光照模型的设计。在实现阶段,采用立方体环境映照来表示场景,采用光测图记录环境映照中光辐射的分布信息,从而提高了绘制效率。实验表明,本模型较成功地实现了光照一致性,在增强现实、图像合成等方面具有很大的应用价值。

To solve the illumination coherence problem in rendering CG objects into real scenes, a new image-based illumination model is proposed. The basic idea is illuminating the scene with the light probe images. To simplify the design of local illumination model, the bidirectional transmit distribution function is introduced. Representing the scene with the cube environment maps, the implementation records the illumination information in light probe images. The model achieves the illumination coherence successfully and has the application in the fields of augmented reality and image synthesis.