Holographic Micromirror Array with Diffuse Areas for Accurate Calibration of 3D Light-Field Display
Holographic Micromirror Array with Diffuse Areas for Accurate Calibration of 3D Light-Field Display
复制标题
具有漫射区域的全息微镜阵列，用于 3D 光场显示的精确校准
DOI：
10.3390/app10207188
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
B. Jackin
中科院分区：
文献类型：
--
作者：
Lode Jorissen;R. Oi;K. Wakunami;Y. Ichihashi;G. Lafruit;Kenji Yamamoto;P. Bekaert;B. Jackin
光场3D显示器需要显示源和微镜阵列屏幕之间的精确对准，以实现无误差的3D可视化。因此，在显示任何3D内容之前，使用外部相机校准系统变得必要。显示源、标定相机和微镜阵列屏幕的内、外参数相互依赖，使得标定过程非常复杂且容易出错。因此，为了简化校准，对显示设置进行了几个假设。我们早先报道了一种基于几个这样的假设的全自动校准方法。在这里，在本文中，我们报告了一种方法，不使用这样的假设，但产生更好的校准。所提出的方法适应光学解决方案，其中微镜阵列屏幕被制造为计算机生成的全息图，在阵列中的每个元件的一个角处雕刻有微小的漫射器。标定算法利用这些漫射区域作为标记，确定显示源像素与微镜阵列屏幕中的反射镜之间的关系。标定结果表明，虚拟重建的三维场景与真实的世界内容吻合良好，没有任何失真。该方法还消除了标定过程中显示源、标定相机和镜阵屏的位置依赖性，使显示系统的设置变得容易。
Light field 3D displays require a precise alignment between the display source and the micromirror-array screen for error free 3D visualization. Hence, calibrating the system using an external camera becomes necessary, before displaying any 3D contents. The inter-dependency of the intrinsic and extrinsic parameters of display-source, calibration-camera, and micromirror-array screen, makes the calibration process very complex and error-prone. Thus, several assumptions are made with regard to the display setup, in order to simplify the calibration. A fully automatic calibration method based on several such assumptions was reported by us earlier. Here, in this paper, we report a method that uses no such assumptions, but yields a better calibration. The proposed method adapts an optical solution where the micromirror-array screen is fabricated as a computer generated hologram with a tiny diffuser engraved at one corner of each elemental micromirror in the array. The calibration algorithm uses these diffusing areas as markers to determine the relation between the pixels of display source and the mirrors in the micromirror-array screen. Calibration results show that virtually reconstructed 3D scenes align well with the real world contents, and are free from any distortion. This method also eliminates the position dependency of display source, calibration-camera, and mirror-array screen during calibration, which enables easy setup of the display system.