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A Method for Extracting Spatial Distance of Holographic Scanning Based on Wavelet Transform and Connected Domain

A technology of holographic scanning and spatial distance, which is applied in the field of optical scanning holography, can solve the problems of many limitations, affecting the accuracy of calculation results, and low accuracy, and achieve the effects of improving accuracy, easy operation, and simple implementation

Inactive Publication Date: 2018-08-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The document "Autofocusing in optical scanning holography" proposes the Wigner distribution to extract the axial spatial information of the object to be measured, but this method has many limitations and low accuracy
[0005] The document "Blind sectional image reconstruction for optical scanningholography" proposes to use the Prewitt operator to extract and reconstruct image edges. This method has good practicability, but due to the existence of defocus noise edges, the accuracy of the calculation results is affected.

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  • A Method for Extracting Spatial Distance of Holographic Scanning Based on Wavelet Transform and Connected Domain
  • A Method for Extracting Spatial Distance of Holographic Scanning Based on Wavelet Transform and Connected Domain
  • A Method for Extracting Spatial Distance of Holographic Scanning Based on Wavelet Transform and Connected Domain

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Embodiment

[0031] The process of the embodiment of the present invention is as follows figure 1 As shown, the basic structure adopted is as follows figure 2 As shown, the wavelength λ=632.8nm of the He-Ne laser Laser, the conversion frequency of the acousto-optic modulator (AOFS1, AOFS2) are Ω / 2π=79.98MHz and (Ω+ΔΩ) / 2π=40MHz respectively, and the focal length of the convex lens L1 is 500mm, the object to be measured such as image 3 As shown, the XOY plane size is 1.5cm×1.5cm, the matrix size is 500×500, and its axial position is z 1 =870mm,z 2 =1070mm, the scanning process can be realized according to the following steps:

[0032] Step 1. Divide the laser light into two beam paths through the first polarizing beam splitter, one of which passes through an AOM and a beam expander in sequence, and the other beam passes through another AOM, a beam expander and a convex lens in sequence Finally, the two beams are condensed by the second polarizing beam splitter and then interfered to fo...

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Abstract

The invention proposes a holographic scanning spatial distance extraction method based on wavelet transform and connected domain, belongs to the field of optical scanning and image reconstruction, and mainly solves the problem of automatically finding the axial spatial position of an object to be measured. In the traditional optical scanning holographic system, the invention extracts the edge information of the reconstructed image through wavelet transform, and uses the connected domain algorithm to remove the defocus noise edge, thereby improving the accuracy of spatial distance extraction. The invention can effectively realize spatial distance extraction and improve the accuracy of spatial distance extraction, and this method is applicable to many fields.

Description

technical field [0001] The present invention relates to the field of optical scanning holography and image reconstruction, in particular to a method for extracting spatial distance of holographic scanning based on wavelet transform and connected domain. Background technique [0002] Optical scanning holography technology, referred to as OSH, is a digital holography technology. It was first proposed by Poon and Korpel. OSH can store the information of 3-dimensional objects as 2-dimensional holograms. Since the technology was proposed, it has been widely used in the fields of scanning holographic microscope, 3D image recognition and 3D optical remote sensing. [0003] Spatial distance extraction technology is an important technology in OSH. It can extract the axial spatial information of the object to be measured, and the axial spatial information of the object to be measured is an important parameter for image reconstruction. Therefore, the spatial distance extraction techno...

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Application Information

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IPC IPC(8): G06K9/46G01B11/25
CPCG01B11/2518G06V10/44
Inventor 欧海燕潘慧宇邵维王秉中
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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