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Coaxial Joint Transform Optical Correlator

An optical correlator and joint transformation technology, which is applied in the field of information optics and optical information processing, can solve the problems that limit the miniaturization and practical development of the joint transformation correlator, and achieve the effect of reducing volume and improving precision

Inactive Publication Date: 2011-12-21
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the traditional off-axis input method greatly limits the miniaturization and practical development of the joint transform correlator, and requires a new structure

Method used

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  • Coaxial Joint Transform Optical Correlator
  • Coaxial Joint Transform Optical Correlator
  • Coaxial Joint Transform Optical Correlator

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: Direct Digital Image Addition

[0048] The target image and the reference image are directly superimposed by the digital image processor and then sent to the spatial light modulator to achieve the purpose of coaxial input. The specific structure is as image 3 Shown:

[0049] Under the control of the embedded processor 2, the image sensor 1 transmits the collected target image to the embedded processor 2, and the embedded processor completes the superposition operation of the target image and the reference image and transmits it to the spatial light modulator 3, and the image Modulated to the collimated laser beam 4, and then through the Fourier lens 5 on its focal plane to obtain a joint transformed power spectrum, received by the detector 6 and sent back to the embedded processor 2. After the embedded processor completes the zero-order operation, the processed power spectrum image is sent to the spatial light modulator 3, and the joint transformation o...

Embodiment 2

[0051] Embodiment 2: Addition of beam-splitting prism images

[0052] The target image and the reference image are transmitted to their respective spatial light modulators, and then the image superposition is completed by the beam splitting prism. For the specific structure, see Figure 4 , the specific process is as follows:

[0053] Under the control of the embedded processor 2 , the image sensor 1 transmits the collected target image to the first reflective spatial light modulator 3 , while the reference image is transmitted from the embedded processor 2 to the second spatial light modulator 7 . If the polarization beamsplitter prism 8 reflects the 0° polarized light and transmits the 90° polarized light, then the collimated laser beam 4 is incident on the polarization beamsplitter prism 8 with a 45° polarization direction, and is divided into two beams of 0° and 90° polarized light. ° polarized light is irradiated to spatial light modulator 3 through 1 / 4 wave plate one 9,...

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Abstract

The invention relates to a coaxial joint transformation optical correlator. On the basis of the joint transformation optical correlator, the image center points of the input reference image and the target image coincide with the optical axis of the Fourier lens, and the power spectrum processing technology is used to eliminate the output zero-order spot. Therefore, the purpose of reducing the volume of the system and increasing the accuracy of correlation peak extraction is achieved.

Description

technical field [0001] The invention belongs to the field of information optics and relates to an optical correlator, in particular to a novel joint transformation optical correlator, which is mainly used in the field of optical information processing such as image recognition and tracking. Through the coaxial input of the target image and the reference image of the joint transformation optical correlator, the invention improves the accuracy while reducing the volume, and lays the foundation for the practical miniature optical correlator. Background technique [0002] The Optical Correlator was first proposed by A. Vander Lugt ("Signal detection by complex spatial filtering," IEEE Trans. Inf. Theory IT-10, 139-145 (1964)). The optical correlator uses optical methods to realize the correlation calculation between the target image and the reference image, so as to realize the recognition and tracking of the image. Optical correlation technology has the characteristics of high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06E3/00
Inventor 贾辉李修建杨建坤常胜利周朴肖光宗樊振方
Owner NAT UNIV OF DEFENSE TECH