Simulation method for reflecting polarized light by underwater target based on bidirectional reflection theory

An underwater target and two-way reflection technology, applied in the field of underwater optical imaging, can solve problems such as insufficient prior knowledge
CN113029342AInactive Publication Date: 2021-06-25NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Publication Date
2021-06-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a simulation method for reflecting polarized light by an underwater target based on a bidirectional reflection theory, and solves the problems of limitation and insufficient priori knowledge for different environments due to the fact that priori knowledge is obtained and an image is restored through an experiment mode based on a specific environment at present. The method includes the steps of 1) setting parameters of an initial light source, a scattering environment and a reflection target; 2) sampling an initial photon coordinate, a motion vector and a Stokes vector according to the initial light source parameters; and calculating an attenuation coefficient, a scattering coefficient and a single albedo according to the scattering environment parameters; 3) simulating photon movement, and sampling photon movement step length and energy weight; 4) judging photon behaviors according to the photon movement step length and the energy weight; 5) calculating the stokes vector of the finally received photon according to the motion vector of the received photon; and 6) carrying out statistical analysis on the finally received photons to obtain analysis results of photon transmission characteristics and polarization characteristics under set environmental parameters.
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Description

technical field

[0001] The invention belongs to the technical field of underwater optical imaging, and in particular relates to a simulation method for reflecting polarized light of an underwater target based on the two-way reflection theory. Background technique

[0002] Underwater optical imaging technology uses blue and green lasers with strong penetrating ability to sea water instead of sound waves for communication or detection activities. The underwater imaging system model is as follows: emit photons—photon transmission—target reflection—photon transmission—receive photons. Underwater optical imaging has the advantages of intuitive target detection, high imaging resolution, and high information content. As an emerging technology, it complements acoustic imaging methods and plays an important role in underwater imaging detection.

[0003] However, due to the water medium and underwater scattering particles such as sediment, algae and other suspended particles, the siz...

Claims

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