Off-axis scanning holographic three-dimensional target real-time joint transformation recognition system and method

A three-dimensional target and joint transformation technology, applied in the field of optical scanning holography, can solve the problems of complex optical path of the system, and achieve the effects of easy correlation calculation, improved recognition efficiency, and increased possibility

Active Publication Date: 2021-08-31
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0005] There is a literature that proposes a 3D image recognition technology based on dual-pupil optical heterodyne scanning, and uses pure phase holographic information and Wigner distribution for 3D image matching recognition, and The feasibility of the proposed method is verified by computer simulation, but the system still has an electrical signal processing unit in the signal processing process, and the optical path of the system is relatively complicated

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  • Off-axis scanning holographic three-dimensional target real-time joint transformation recognition system and method
  • Off-axis scanning holographic three-dimensional target real-time joint transformation recognition system and method
  • Off-axis scanning holographic three-dimensional target real-time joint transformation recognition system and method

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Embodiment 1

[0063] An off-axis scanning holographic 3D target real-time joint transformation recognition system, such as figure 1 As shown, the labels in the accompanying drawings respectively represent: laser 1, spatial filter 2, first lens 3, first beam splitter 4, first mirror 5, second lens 6, shutter 7, second mirror 8 , the second beam splitter 9, the first stage 10, the third lens 11, the first photodetector 12, the computer 13, the third mirror 14, the spatial light modulator 15, the fourth lens 16, the second carrier Object stage 17, second photodetector 18, real-time display 19; Wherein, the optical axis direction of the laser 1 outgoing light is consistent with the center of the spatial filter 2, and the spatial filter 2 is placed between the first lens 3 and the laser 1, and The distance between the spatial filter 2 and the first lens 3 is the focal length of the first lens 3; the first beam splitter 4 is placed vertically in the direction of the light transmitted by the first...

Embodiment 2

[0065] A real-time joint transformation recognition method for off-axis scanning holographic three-dimensional targets, specifically comprising the following steps:

[0066] (1) The parallel light emitted by the laser 1 is collimated and modulated into a divergent spherical wave by the spatial filter 2. The spherical beam passes through the first lens 3 to form a plane wave; the plane wave is divided into two paths by the first beam splitter 4, wherein the transmitted light path After the second reflector 8 and the reflected light path pass through the first reflector 5, the second lens 6, and the shutter 7, they converge at the second beam splitter 9, and the second reflector 8 is adjusted so that the plane wave is combined with the second beam splitter 9. The direction of the wave vector of the spherical wave forms a deflection angle θ, and interference occurs at the object plane to form an off-axis Fresnel zone plate, as figure 2 and 3 shown.

[0067] (2) The off-axis Fr...

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Abstract

The invention discloses an off-axis scanning holographic three-dimensional target real-time joint transformation recognition system and method, and belongs to the technical field of optical scanning holographic three-dimensional object real-time recognition. The recognition system comprises a laser, a spatial filter, a first lens, a first beam splitter, a first reflective mirror, a second lens, a shutter, a second reflective mirror, a second beam splitter, a first objective table, a third lens, a first photoelectric detector, a computer, a third reflective mirror, a spatial light modulator, a fourth lens, a second objective table, a second photoelectric detector and a real-time display. The three-dimensional object information is recorded in an off-axis scanning holographic mode, a complex electrical signal processing unit in traditional optical scanning holography is omitted, the light path of the system is simplified, and the recognition efficiency of the three-dimensional target object of the system is improved. The three-dimensional object hologram is recognized through optical joint transformation, the problem of accurate positioning points in matching correlation filtering recognition does not exist, the structure is flexible, and correlation operation is easy to achieve.

Description

technical field [0001] The invention relates to the technical field of optical scanning holography, in particular to an off-axis scanning holographic three-dimensional target real-time joint transformation recognition system and method. Background technique [0002] Three-dimensional object recognition technology can be used in 3D microscopy, biomedical imaging and recognition, robot vision, and optical remote sensing. Compared with traditional two-dimensional image recognition, three-dimensional object recognition has the advantage of high recognition sensitivity. Since the object information recorded by the general optical system only includes intensity information, not the phase information of the object, and can only process two-dimensional information of the object, it cannot directly realize the recognition of three-dimensional objects. [0003] Optical Scanning Holography (OSH) is a special digital holography combined with photoelectric hybrid technology proposed by P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/00G03H1/02
CPCG03H1/0005G03H1/02G03H2001/0088G03H2001/0208G03H2001/0224G03H2001/0216
Inventor 张亚萍姚勇伟许蔚张竟原范厚鑫
Owner KUNMING UNIV OF SCI & TECH
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