Random Scattering Optical Imaging System and Imaging Method Based on Sparse Representation

Abstract

The invention discloses a random scattering optical imaging system and imaging method based on sparse representation. The imaging system includes a light source (1), a spatial filter (2), an aperture stop (3), a collimator lens (4), a mirror (5), a spatial light modulator (6), a random scattering medium (7), Lens (8), detector array (9) and main control machine (10). The light emitted by the light source enters the spatial light modulator through the reflector after passing through the spatial filter, aperture diaphragm and collimating lens; the main control computer loads the imaging target on the spatial light modulator, so that After the light passes through the random scattering medium and the lens, it forms a coded speckle field image on the detector array and transmits it to the main control computer; the main control computer decodes and reconstructs the coded speckle field image and removes background noise to obtain the target image. The invention has the advantages of simple structure, good real-time performance and strong noise resistance, and can be used for high-speed imaging of random scattering in a noise environment in a laboratory.

Description

technical field [0001] The invention belongs to the technical field of image processing and imaging, relates to an optical imaging system and image reconstruction, and can be used for high-speed random scattering imaging in a noisy environment in a laboratory. Background technique [0002] In random scattering media such as biological tissues and clouds, there is often multiple scattering, and the mean free path of light propagation inside the medium is extremely short, resulting in the loss of the relative position of the original incident light field when the light incident on the random scattering medium exits. relationship and cannot be clearly imaged. For example, satellite remote sensing imaging needs to collect light reflected from ground targets and pass through the atmosphere. For example, in the case of non-invasive and non-destructive detection, it is necessary to perform in-depth imaging of biological tissues, but due to the scattering of particles inside biolog...

AI Technical Summary

Problems solved by technology

The wavefront modulation technology adjusts the wavefront of the incident light wave through feedback control, so that the adjusted light wave can be focused after passing through a random scattering medium. However, this imaging system based on optical phase conjugation has a complex optical path, poor real-time imaging and anti-noise performance. Poor, not suitable for imaging in noisy environments

The speckle field reconstruction technology realizes imaging by extracting the initial incident light wave information from the received speckle field image. It has good anti-noise performance, but it needs to measure the transmission matrix of the random scattering medium and directly reconstruct the entire speckle field. Huge, takes a long time

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