Li Nan-Nan, Wang Di, Li Yi-Long, Wang Qiong-Hua
Opt Express. 2020 Nov 9;28(23):34378-34389. doi: 10.1364/OE.406265.
In this paper, a curved composite hologram (CCH) generation method with suppressed speckle noise is proposed. The recorded 3D object is considered as many layers with different depths and the planar hologram (PH) for each layer is generated accordingly. Then the PH is transformed to curved hologram (CH). The CH of the recorded 3D object can be generated by superposing the CHs for all the layers. Also, the linear phase factor is superposed to the CH of the object. For different objects, the bending angle and linear phase factor of the hologram are different. The CCH is generated by superimposing the CHs of different objects. Finally, the CCH is encoded by using the error diffusion method and optimized by superposing of the digital lens. When the CCH is reproduced from different angles, the reconstructed images with suppressed speckle noise can be displayed. The experimental results verify the feasibility of the proposed method.
本文提出了一种抑制散斑噪声的弯曲复合全息图（CCH）生成方法。将记录的三维物体视为具有不同深度的多个层，并相应地生成每层的平面全息图（PH）。然后将PH变换为弯曲全息图（CH）。通过叠加所有层的CH，可以生成记录的三维物体的CH。此外，将线性相位因子叠加到物体的CH上。对于不同的物体，全息图的弯曲角度和线性相位因子是不同的。通过叠加不同物体的CH来生成CCH。最后，使用误差扩散方法对CCH进行编码，并通过叠加数字透镜进行优化。当从不同角度再现CCH时，可以显示具有抑制散斑噪声的重建图像。实验结果验证了该方法的可行性。
