Holographic Scanning Spatial Distance Extraction Method Based on Phase Holographic Correlation
A holographic scanning and spatial distance technology, applied in the field of optical holographic scanning, can solve the problems affecting the accuracy of calculation results, the accuracy cannot be guaranteed, and the practicability is not strong, and achieves strong practicability, high accuracy, and applicability. wide effect
Inactive Publication Date: 2019-08-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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The document "Three-dimensional matching by use of phase-onlyholographic information and the Wigner distribution" proposes to use the Wigner distribution to extract the axial spatial information of the object to be measured, but this method can only be applied to the distance between two matched objects Extraction itself has limitations, narrow scope of application, and poor practicability
The document "Blind sectional image reconstruction for optical scanning holography" 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 and accuracy of the calculation results are affected. not guaranteed
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[0047] The present invention will be further described below with reference to the accompanying drawings and embodiments, and the mode of the present invention includes but not limited to the following embodiments.
[0048] The purpose of this embodiment is to provide a method for extracting the spatial position of holographic scanning based on phase correlation. Such as figure 1 As shown, the method includes the following steps:
[0049] (1) Formation of Fresnel interference fringes
[0050] Such as figure 2 As shown, the angular frequency emitted by the same light source is ω 0The light is split into beam A and beam B by the first polarization beam splitter BS1, and beam A passes through the acousto-optic modulator AOFS, beam expander BE1 and pupil p 1 (x,y), forming a spherical wave; beam B passes through beam expander BE2 and pupil p 2 (x, y), forming a plane wave; after the two beams of light pass through the lenses L1 and L2 respectively, they interfere at the seco...
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The invention discloses a holographic scanning space distance extraction method based on phase holographic correlation, belongs to the field of optical holographic scanning. The method specifically comprises the following several steps: formation of Fresnel interference fringes, formation of a target object hologram, formation of a reference object hologram and space distance extraction of a target object. Time-frequency analysis is carried out on the phase correlation of the target object and the reference object through Wigner distibution, then an oblique line containing the axial position information of the target object is obtained, and the axial position information of the target object can be acquired by determining the slope of the oblique line, so that axial space information extraction for the target object is realized, the method is wide in applicability and high in practicability, and the space distance precision of the extracted target object is high.
Description
technical field [0001] The invention relates to the field of optical holographic scanning, in particular to a method for extracting spatial distance of holographic scanning based on phase holographic correlation. Background technique [0002] Optical scanning holography (OSH) is a branch of digital holography, which can store the information of three-dimensional objects as a two-dimensional hologram, which was first proposed by Poon and Korpel. 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] The spatial distance extraction technology is an important technology in OSH. It can extract the axial position information of the object to be measured, and the axial position information of the object to be measured is an important parameter for image reconstruction. Therefore, the spatial distance extraction technology is also has important research value. The do...
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IPC IPC(8): G03H1/08G03H1/10G03H1/22
CPCG03H1/0866G03H1/10G03H1/2286G03H2001/2292
Inventor 欧海燕王馨邵维王秉中
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA