Non-vision-field imaging technology based on single-photon detector

Abstract

The invention provides a non-vision-field imaging technology based on a single-photon detector. The technology includes the main contents of forward and reverse light transmitting, non-vision-field imaging boundary, and non-vision-field imaging by means of the single-photon detector, and mainly includes the steps of giving the total radiation flux when light is reflected out of the surface of a material, directly imaging a visible light material panel by detecting pixels, vectorizing imaging models according to the alphabet sequencing mode to express indirect illumination components and conduct solving through the iterative least square method, recording the behaviors of a photon through the single-photon avalanche diode detector, recording the incidence time of a photon stream by means ofa determined time window, expressing the probability of detecting a certain number of photon behaviors through poisson distribution, and describing the problem into a maximum likelihood estimation problem and conducting solving. A non-vision-field imaging nonlinear model and a dual-convex solving method are put forward on the basis of the single-photon detector, and the technology has the advantages of being better in algorithm performance and more robust in system.

Description

technical field [0001] The invention relates to the field of non-line-of-sight imaging, in particular to a non-line-of-sight imaging technology based on a single photon detector. Background technique [0002] With the rapid development of laser imaging technology and the improvement of detector precision, a new optical imaging mode, that is, non-line-of-sight imaging technology, has emerged. It is designed to image areas outside the detector's line of sight, such as objects behind corners of walls, behind smoke. Non-line-of-sight imaging technology is mainly used to detect hidden objects in urban street corners and houses. It can bypass corners or obstacles to image hidden target objects, and realize positioning targets in areas outside the line of sight. Utilizing this technology can effectively prevent urban traffic accidents, locate the location of living bodies in disaster rescue (fire, earthquake, etc.), improve the combat capabilities of the army, etc. In the past te...

AI Technical Summary

Problems solved by technology

[0004] In view of the disadvantages of low algorithm performance and insufficient robustness of the system in the existing technology, the purpose of the present invention is to provide a non-line-of-sight imaging technology based on a single photon detector. Firstly, the total radiant flux when light is reflected from the surface of the material is given ; then the visible light material panel is directly imaged by the detection pixels; then the imaging model is vectorized according to the alphabetical order to represent the indirect illumination components, and is solved using the iterative least squares method; finally, the single photon avalanche diode detector is used to record the photon Behavior, use a certain time window to record the time of incident photon flow, use Poisson distribution to express the probability of detecting a certain number of photon behaviors, describe the problem as a maximum likelihood estimation problem and solve it

Images