Science & Technology Research Laboratories, Japan Broadcasting Corporation (NHK), Kinuta 1-10-11, Setagaya, Tokyo, 157-8510, Japan.
Sci Rep. 2019 Mar 4;9(1):3363. doi: 10.1038/s41598-019-39728-8.
Although three-dimensional (3D) imaging and extended depth-of-field (DOF) imaging are completely opposite techniques, both provide much more information about 3D scenes and objects than does traditional two-dimensional imaging. Therefore, these imaging techniques strongly influence a wide variety of applications, such as broadcasting, entertainment, metrology, security and biology. In the present work, we derive a generalised theory involving incoherent digital holography to describe both 3D imaging and quasi-infinite-DOF (QIDOF) imaging, which allows us to comprehensively discuss the functions of each imaging technique. On the basis of this theory, we propose and develop a bimodal incoherent digital holography system that allows both 3D imaging and QIDOF imaging. The proposed system allows imaging objects using spatially incoherent light and reconstructing 3D images or QIDOF images solely by changing the phase pattern of a spatial light modulator and without requiring mechanical adjustments or any other modifications to the setup. As a proof-of-principle experiment, we evaluate the DOF and record holograms of a reflective object with the proposed system. The experimental results show that the generalised theory is effective; our demonstration platform provides the function of 3D and QIDOF imaging.
虽然三维（3D）成像和扩展景深（DOF）成像完全是两种相反的技术，但它们都比传统的二维成像提供了更多关于 3D 场景和物体的信息。因此，这些成像技术强烈影响着各种应用，如广播、娱乐、计量学、安全和生物学。在本工作中，我们推导了一个涉及非相干数字全息术的广义理论，以描述 3D 成像和准无限景深（QIDOF）成像，这使我们能够全面讨论每种成像技术的功能。基于这一理论，我们提出并开发了一种双模态非相干数字全息系统，该系统既可以进行 3D 成像，也可以进行 QIDOF 成像。所提出的系统允许使用空间非相干光对物体进行成像，并仅通过改变空间光调制器的相位图案来重建 3D 图像或 QIDOF 图像，而不需要对设置进行机械调整或任何其他修改。作为原理验证实验，我们使用所提出的系统评估了反射物体的景深并记录了其全息图。实验结果表明，广义理论是有效的；我们的演示平台提供了 3D 和 QIDOF 成像功能。
