Large field-of-view scattering imaging method based on mobile speckle light source

Abstract

The invention discloses a large field-of-view scattering imaging method based on a mobile speckle light source. The method comprises the following steps that: a large field-of-view scattering imagingdevice based on a mobile speckle light source is built to carry out imaging on a to-be-observed target after transmitting of a scattering medium, wherein the device includes a mobile speckle light source and a camera sensor and incoherent light generated by the mobile speckle light source passes through the target and the scattering medium successively and then the processed light is collected andimaged by the camera sensor; parameters of the mobile speckle light source and the camera sensor are set to establish a correspondence relationship between the collected image parameters and the mobile speckle light source so as to realize effective multi-image collection; a plurality of collected images are preprocessed to construct an integrated intensity matrix; and according to the integratedintensity matrix, autocorrelation information of the target is extracted based on an autocorrelation operation and spatial domain distribution information of the target is reconstructed by using a phase recovery algorithm. With the disclosed method, the field of view of the system is not limited by the memory effect range.

Description

technical field [0001] The invention relates to the fields of computer vision and digital image processing, in particular to a large-field-of-view scattering imaging method based on a moving speckle light source. Background technique [0002] Scattering media widely exist in nature, especially in the fields of deep sea exploration and biological tissue observation. Due to the unknown and complex internal refractive index distribution of the scattering medium, it will change the propagation direction of the original light, which makes it very difficult to reconstruct the target behind the scattering layer. [0003] Existing scattering imaging methods through strong scattering media mainly include the following four categories: wavefront shaping method, deconvolution method based on point spread function (PSF), scanning correlation imaging method, and single-exposure correlation imaging method. Among them, the wavefront shaping method introduces a spatial light modulator (SLM...

AI Technical Summary

Problems solved by technology

Scanning correlation imaging and single-exposure correlation imaging can both use autocorrelation and phase recovery methods to achieve non-invasive reconstruction of simple targets within the range of memory effects, but their field of view is also limited Due to the memory effect, these two imaging methods must be used only when a certain object distance or the size of the object to be observed is satisfied, and cannot be applied to large field of view scattering imaging in complex and changeable situations

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