Single-pixel photon counting spread spectrum compression depth imaging method

Abstract

The invention discloses a single-pixel photon counting spread spectrum compression depth imaging method, which comprises the following steps: S1, sending, by a pseudo-random code generator, based on a programmable logic device, a pseudo-random code to drive a vertical surface laser to emit a light beam; s2, generating a random matrix, and loading the generated random matrix to a digital light projection chip through an electric signal; s3, enabling the light beam emitted by the vertical surface laser to reach the target and receiving, by the receiving system, the returned light beam; s4, acquiring a photon arrival time point value through a single-photon detector and a photon time arrival recorder within a certain integral time; s5, obtaining a measurement vector through an optimal correlation detection method; s6, reconstructing a depth image of the target through a sparse programming inversion method. The problem of range ambiguity of current single-pixel imaging is solved, the receiving signal-to-noise ratio of single-pixel imaging is improved and the modulation frequency is reduced by utilizing an optimal correlation detection method, so that the measurement matrix dimension is reduced, the data storage redundancy is reduced, and the imaging efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of laser imaging, in particular to a single-pixel single-photon counting spread spectrum compression depth imaging method. Background technique [0002] In recent years, the research on time-correlated photon counting spread spectrum two-dimensional imaging technology has been widely carried out. [0003] The existing technology is based on the best correlation detection method. Firstly, the pseudo-random code transmitted along the way and the arrival time point of the received pseudo-random photon are cross-correlated, and then the peak value and amplitude value of the cross-correlation function are extracted as the depth and intensity of a single pixel. information. The light spot of a single pixel is moved through a two-dimensional guide rail or a vibrating mirror, and the depth and intensity information of the two-dimensional plane is obtained by scanning one by one. This scanning imaging technology ne...

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Problems solved by technology

However, the existing problem of this kind of existing technology is that, at a lower SNR, it is often necessary to increase the modulation number M of the random matrix to recover a depth image with a high SNR, and the dimension of the measurement matrix is ​​too large. It will undoubtedly increase the storage burden of the system and reduce the efficiency of system measurement

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