Imaging method for target hidden in opaque scattering medium

Abstract

The invention provides an imaging method for a target hidden in an opaque scattering medium. An imaging light path is formed on the basis of a conventional coherent diffraction imaging principle, whenthe target is blocked by the opaque scattering medium, an object is radiated by laser, and the target hidden behind the scattering medium is reconstructed. Imaging devices only comprise a laser, a scattering device, a Fourier lens and a CCD detector. According to the method, a reconstruction algorithm is a hybrid input-output phase retrieval algorithm; the target can be reconstructed only by collecting a single power spectrum image; in the reconstruction algorithm, an initial guess for the target employs an image obtained by carrying out inverse Fourier transform on the power spectrum image collected in an experiment, so convergence of the algorithm is accelerated; feedback parameters (which are 0.3-0.8, 0.8-1.0 and 1.0-1.25 respectively selected in an underexposure state, a correct exposure state and an overexposure state ) of the algorithm are adjusted for the power spectrum images which are collected in real time in different exposure degrees; and finally, the target hidden in thescattering medium is reconstructed.

Description

technical field [0001] The invention relates to the fields of coherent diffraction imaging and scattering medium imaging, in particular to an imaging method for a target hidden in an opaque scattering medium. Background technique [0002] The imaging object hidden in the opaque scattering medium layer is a hotspot in the application of biomedicine and nanotechnology in underwater imaging research. The difficulty of imaging is that the opaque scattering layer causes irregular scattering and interferes with the beam, making the important information of the object lost or disordered. So far, many methods have been tried to solve the above problems. The existing non-destructive coherent imaging methods for covert targets either require angle scanning or additional holographic reference light, which undoubtedly increases the complexity of practical operation. Meanwhile, deep learning (DL) methods have also been tried for scatter imaging, but DL methods are still inefficient. ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention proposes an imaging method for targets hidden in opaque scattering media, which solves the problems of complex optical system construction, poor real-time performance of algorithms, and time-consuming image preprocessing after imaging in the prior art. It also solves the problem of algorithm convergence stagnation in image reconstruction, realizes simple and easy operation of imaging optical path, strong real-time reconstruction algorithm, and clear recovery target

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