Abstract
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 times 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.
Highlights
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)
To check the image quality, we compared the peak signal-to-noise ratio (PSNR) and the structural similarity (SSIM) of numerically reconstructed images from the computer-generated holograms (CGHs) obtained using the proposed method with the images written on the drawing tablet, which we considered as ground truth
We have proposed an interactive 3D projection system based on electro-holography that runs on a consumer CPU with a drawing tablet
Summary
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). Sando et al proposed a 3D holographic-display system with a digital micromirror device (DMD) and rotating mirrors They calculated CGHs using a 3D fast Fourier transform (FFT) based algorithm and succeeded in projecting 360◦ viewable 3D video at 10 Hz using a GPU with mouse and keyboard interactions[20]. They captured finger gestures with leap motions and used an input interface for rotate-and-zoom operation Such interactive holographic-display systems have been successfully implemented at the laboratory level, they usually require GPU-based computation; miniaturization and power saving remain significant challenges. We did not previously create an interactive system using this method, and the computation speed was not fast enough to generate smooth interactive playback
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