Nishitsuji Takashi, Kakue Takashi, Blinder David, Shimobaba Tomoyoshi, Ito Tomoyoshi
Faculty of Systems Design, Tokyo Metropolitan University, 6-6 Asahigaoka, Hino, Tokyo, 191-0065, Japan.
Garduate School of Engineering, Chiba University, 1-33 Yayoicho, Inage-ku, Chiba, 263-8522, Japan.
Sci Rep. 2021 Jan 8;11(1):147. doi: 10.1038/s41598-020-78902-1.
Holography is a promising technology for photo-realistic three-dimensional (3D) displays because of its ability to replay the light reflected from an object using a spatial light modulator (SLM). However, the enormous computational requirements for calculating computer-generated holograms (CGHs)-which are displayed on an SLM as a diffraction pattern-are a significant problem for practical uses (e.g., for interactive 3D displays for remote navigation systems). Here, we demonstrate an interactive 3D display system using electro-holography that can operate with a consumer's CPU. The proposed system integrates an efficient and fast CGH computation algorithm for line-drawn 3D objects with inter-frame differencing, so that the trajectory of a line-drawn object that is handwritten on a drawing tablet can be played back interactively using only the CPU. In this system, we used an SLM with 1,920 [Formula: see text] 1,080 pixels and a pixel pitch of 8 μm × 8 μm, a drawing tablet as an interface, and an Intel Core i9-9900K 3.60 GHz CPU. Numerical and optical experiments using a dataset of handwritten inputs show that the proposed system is capable of reproducing handwritten 3D images in real time with sufficient interactivity and image quality.
全息术是一种用于逼真三维（3D）显示的有前途的技术，因为它能够使用空间光调制器（SLM）重放从物体反射的光。然而，计算计算机生成全息图（CGH）所需的巨大计算量——这些全息图以衍射图案的形式显示在SLM上——对于实际应用（例如用于远程导航系统的交互式3D显示）来说是一个重大问题。在此，我们展示了一种使用电子全息术的交互式3D显示系统，该系统可以在消费者的中央处理器（CPU）上运行。所提出的系统将一种针对线条绘制的3D物体的高效快速CGH计算算法与帧间差分相结合，这样，仅使用CPU就可以交互式地回放手写在绘图板上的线条绘制物体的轨迹。在该系统中，我们使用了一个具有1920×1080像素且像素间距为8μm×8μm的SLM、一个绘图板作为接口以及一个英特尔酷睿i9 - 9900K 3.60 GHz的CPU。使用手写输入数据集进行的数值和光学实验表明，所提出的系统能够以足够的交互性和图像质量实时再现手写3D图像。
