Encrypted Three-dimensional Dynamic Imaging using Snapshot Time-of-flight Compressed Ultrafast Photography.

Jinyang Liang,Liang Gao,Chiye Li,Lihong V Wang,Pengfei Hai

doi:10.1038/srep15504

Abstract

Compressed ultrafast photography (CUP), a computational imaging technique, is synchronized with short-pulsed laser illumination to enable dynamic three-dimensional (3D) imaging. By leveraging the time-of-flight (ToF) information of pulsed light backscattered by the object, ToF-CUP can reconstruct a volumetric image from a single camera snapshot. In addition, the approach unites the encryption of depth data with the compressed acquisition of 3D data in a single snapshot measurement, thereby allowing efficient and secure data storage and transmission. We demonstrated high-speed 3D videography of moving objects at up to 75 volumes per second. The ToF-CUP camera was applied to track the 3D position of a live comet goldfish. We have also imaged a moving object obscured by a scattering medium.

Highlights

The scattered photons from the object carry a variety of tags, such as emittance angle and time-of-flight (ToF), which convey the 3D surface information
To quantify the system’s depth resolution, we imaged a 3D target with fins of varying heights (Fig. 2a)
Image reconstruction retrieved the ToF 2D images (Fig. 2b), and the corresponding movie of the ToF snapshots of the x-y light distributions is in Supplementary Video 1, which reveals the arrival sequence of photons backscattered by these fins

Summary

Introduction

The scattered photons from the object carry a variety of tags, such as emittance angle and time-of-flight (ToF), which convey the 3D surface information Using these photon tags, numerous 3D imaging techniques have been developed, including structured-illumination[12,13], holography[14], streak imaging[15,16], integral imaging[17], multiple camera or multiple single-pixel detector photogrammetry[18,19], and ToF detection[20]. Numerous 3D imaging techniques have been developed, including structured-illumination[12,13], holography[14], streak imaging[15,16], integral imaging[17], multiple camera or multiple single-pixel detector photogrammetry[18,19], and ToF detection[20] Among these techniques, holography has demonstrated secure 3D surface imaging.

Results

Discussion

Conclusion