面向层结构的角谱传播计算全息算法(特邀)

为了提高计算全息图的生成速度和再现像的重建质量, 文中基于角谱传播的精确衍射计算过程, 提出了一种面向层结构的角谱传播计算全息算法。该算法将三维场景分层, 并将每层场景通过角谱衍射运算得到子全息图。通过子全息图在干涉面的叠加, 最终生成整个三维场景的全息图。由于角谱运算没有旁轴近似, 因此对于不同类型的三维数据, 利用该算法计算得到的全息图均可重建得到精确的再现像。此外, 该算法的计算复杂度不取决于三维场景的复杂度, 只取决于分层层数, 因此运算速度较传统点元法可提高两三个数量级。该算法为三维场景的动态显示提供了一种有效的解决方案。

Abstract

A computer-generated holographic(CGH) algorithm based on layer structure using angular spectrum propagation theory was proposed in order to improve the calculation speed and the reconstruction quality. The 3D scene was stratified, and the sub holograms of each layer were obtained by angular spectrum diffraction method. The hologram of the whole 3D scene was generated by the superposition of these sub holograms. Because there was no paraxial approximation in angular spectrum diffraction method, the algorithm could be applied to different kinds of 3D models. Besides, the computational complexity of the algorithm depended on the number of layers rather than the complexity of 3D scenes, so the computation speed could be increased by 2-3 orders of magnitude. The algorithm provides an effective solution for dynamic 3D display.

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曹良才, 何泽浩, 赵燕, 金国藩. 面向层结构的角谱传播计算全息算法(特邀)[J]. 红外与激光工程, 2018, 47(6): 0603001. Cao Liangcai, He Zehao, Zhao Yan, Jin Guofan. Computer-generated holographic algorithm based on layer structure using angular spectrum propagation theory(Invited)[J]. Infrared and Laser Engineering, 2018, 47(6): 0603001.

面向层结构的角谱传播计算全息算法(特邀)

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