This paper considers panorama images used for street views. Their viewing angle of 360° causes pixels at the top and bottom to appear stretched and warped. Although current image completion algorithms work well, they cannot be directly used in the presence of such distortions found in panoramas of street views. We thus propose a novel approach to complete such 360° panoramas using optimizationbased projection to deal with distortions. Experimental results show that our approach is efficient and provides an improvement over standard image completion algorithms.
提出一种复杂环境光照条件下交互级毛发绘制与外观编辑的算法,其中光源采用球面径向基函数(SRBF)表示.推导出了一个可以用来精确表达Marschner毛发散射函数(Marschner S R,Jensen H W,Cammarano M,et al.Light scattering from human hair fibers.ACM Transactions on Graphics,2003,22(3):780-791)[2]的简洁一维圆高斯表达,该表达可以高效地以解析形式计算每个SRBF光源与毛发散射函数的积分,因此支持高效的单次散射和多次散射计算.与前人工作不同,文中算法完全在运行时进行所有的计算,不需要昂贵的预计算步骤,因此可以动态地改变毛发的散射参数.分析表明,文中提出的近似表示是精确且简洁的.此外,该算法可以处理椭圆头发截面的情况.通过在GPU上实现,文中算法可以达到交互帧率.
