Passive non-line-of-sight imaging methods are often faster and stealthier than their active counterparts, requiring less complex and costly equipment. However, many of these methods exploit motion of an occluder or the hidden scene, or require knowledge or calibration of complicated occluders. The edge of a wall is a known and ubiquitous occluding structure that may be used as an aperture to image the region hidden behind it. Light from around the corner is cast onto the floor forming a fan-like penumbra rather than a sharp shadow. Subtle variations in the penumbra contain a remarkable amount of information about the hidden scene. Previous work has leveraged the vertical nature of the edge to demonstrate 1D (in angle measured around the corner) reconstructions of moving and stationary hidden scenery from as little as a single photograph of the penumbra. In this work, we introduce a second reconstruction dimension: range measured from the edge. We derive a new forward model, accounting for radial falloff, and propose two inversion algorithms to form 2D reconstructions from a single photograph of the penumbra. Performances of both algorithms are demonstrated on experimental data corresponding to several different hidden scene configurations. A Cramer-Rao bound analysis further demonstrates the feasibility (and utility) of the 2D corner camera.
Non-line-of-Sight Imaging via Neural Transient Fields
ShanghaiTech University（上海科技大学）；DGene, Inc.（德晋医疗科技有限公司）；Shanghai Institute of Technical Physics, Chinese Academy of Sciences（中国科学院上海技术物理研究所）；University of Chinese Academy of Sciences（中国科学院大学）；Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences（中国科学院上海微系统与信息技术研究所）；Shanghai Engineering Research Center of Intelligent Vision and Imaging（上海智能视觉影像工程技术研究中心）
Seeing Around Corners with Edge-Resolved Transient Imaging
Boston University（波士顿大学）；Charles Stark Draper Laboratory, Inc.（查尔斯·斯塔克·德雷珀实验室公司）；Heriot-Watt University（赫瑞瓦特大学）；University of South Florida（南佛罗里达大学）；University of Toulouse（图卢兹大学）；Massachusetts Institute of Technology（麻省理工学院）
