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Optical scanning holographic self-focusing method based on edge gray scale difference function

An optical scanning and self-focusing technology, applied in the field of optical scanning holography and self-focusing, achieves the effect of simple calculation process, suitable for promotion, and low algorithm complexity

Inactive Publication Date: 2018-10-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention proposes an evaluation function of the focused image. There is a difference between the focused image and the defocused image on the edge. The present invention further amplifies this difference to form an evaluation function of the focused image, which solves the problem of the holographic image well. For the self-focusing problem, compared with the existing technology, the edge gray difference (EGD) function is simple to calculate and has high accuracy. It can realize the self-focusing problem of various types of holographic images, and has strong applicability.

Method used

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  • Optical scanning holographic self-focusing method based on edge gray scale difference function
  • Optical scanning holographic self-focusing method based on edge gray scale difference function
  • Optical scanning holographic self-focusing method based on edge gray scale difference function

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Experimental program
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Embodiment 1

[0073] The basic structure of the experiment adopted in this embodiment is as follows: figure 2 Shown, wherein the wavelength λ=632.8nm of He-Ne laser Laser Laser, the focal length of convex lens L1 is 200mm, the focal length of L2 is 75mm, the object to be measured of embodiment is as image 3 As shown, the cross-section matrix size of the sliced ​​object is 300×300. The reconstruction range of the embodiment is [9.5mm, 11.5mm], Δτ=0.05. The difference amplification degree value N=10 in the EGD function.

[0074] image 3 It is the three-dimensional sliced ​​object to be measured in Example 1 of the present invention; Figure 4 It is the self-focusing result of Example 1 of the present invention; Figure 5 Among them, (a) is the reconstructed image of the first layer slice in Embodiment 1 of the present invention, and (b) is the reconstructed image of the second layer slice in Embodiment 1 of the present invention.

Embodiment 2

[0076] The basic structure of the experiment adopted in this embodiment is as follows: figure 2 Shown, wherein the wavelength λ=632.8nm of He-Ne laser Laser Laser, the focal length of convex lens L1 is 200mm, the focal length of L2 is 75mm, the object to be measured of embodiment is as Image 6 As shown, the cross-section matrix size of the sliced ​​object is 300×300. The reconstruction range of the embodiment is [9.5mm, 11.5mm], Δτ=0.05. The difference amplification degree value N=10 in the EGD function.

[0077] Image 6 It is the three-dimensional slice object to be measured in Example 2 of the present invention; Figure 7 The middle is the self-focusing result of embodiment 2 of the present invention; Figure 8 (a) is the reconstructed image of the first slice in Example 2 of the present invention, and (b) is the reconstructed image of the second slice in Example 2 of the present invention.

[0078] Depend on Figure 4 with Figure 7 It can be seen that the method ...

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Abstract

The invention discloses an optical scanning holographic self-focusing method based on an edge gray scale difference function and belongs to the technical field of optical scanning holographic and self-focusing. The method comprises following steps of acquiring digital holographic images, carrying out equal step length rebuilding, calculating an edge brightness matrix and calculating an edge gray scale difference function value. According to the invention, by calculating the edge gray scale difference function value of a real part of the rebuilt holographic image, self-focusing is achieved. Inthis way, the self-focusing problem of the holographic image can be effectively solved and the edge gray scale difference function value can serve as a focusing evaluation index of other types of images.

Description

technical field [0001] The invention belongs to the technical field of optical scanning holography and self-focusing, and in particular relates to an optical scanning holographic self-focusing method based on an edge gray scale difference function. Background technique [0002] Optical scanning holographic technology is an important branch of digital holographic technology. This technology uses optical heterodyne technology and scanning holographic technology to greatly improve the resolution of scanning holographic images. In 1979, Poon and Korpel first proposed this concept . So far, this technology has been widely used in fields such as holographic image encryption, scanning holographic microscopy, and image recognition. [0003] In the field of holographic technology, the reconstruction of hologram has always been a research hotspot, and for holographic reconstruction technology, it is very important to obtain the axial reconstruction distance of the object. Therefore,...

Claims

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Application Information

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IPC IPC(8): G02B27/00G02B7/36
CPCG02B7/36G02B27/0012
Inventor 欧海燕刘柯邵维王秉中
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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