镜头重影效果的真实感绘制

Realistic Rendering of Lens Ghost Effects

针对现有镜头重影效果绘制方法存在的光线追踪效率低和绘制效果差的问题,提出一种基于物理的真实感镜头重影效果绘制方法.该方法以精确的相机镜头模型为基础,首先计算镜头入射光瞳的位置和孔径,并利用入射光瞳进行初始光线采样来减少无效光线数量,提高光线追踪效率;其次采用确定序列光谱光线追踪方法绘制重影的色差,并考虑了孔径光阑形状、镜头镀膜以及镜头遮挡对镜头重影的影响;最后将镜头重影绘制与光线追踪绘制框架融合,构成镜头重影场景绘制的统一框架,并在三维场景中实现了镜头重影效果的绘制.实验结果表明,文中方法能够有效地模拟具有较强真实感的镜头重影效果.

To address problems of current lens ghost rendering methods, a physically based method for ren-dering realistic lens ghost effects is proposed. This method starts from accurately modeling optical structure of camera lens. Firstly, in order to improve the efficiency of ray tracing and reduce invalid rays, the entrance pupil is computed to assist to generate initial sampling rays. Then, a determinant sequential spectral ray tracing method is employed to simulate the chromatic aberration of lens ghost. Additionally, the effects of aperture stop, lens-coating and lens occlusion on lens ghost are simulated. Finally, the lens ghost rendering method is integrated into the ray tracing based rendering framework, forming a unified rendering framework of lens ghost scenes, which merges lens ghost into three-dimensional scenes. Experimental results show that the proposed method effectively render realistic lens ghost and improve the realism of scenes.