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A self-focusing and reconstruction method for optical scanning holography based on connected domains

An optical scanning and connected domain technology, applied in the field of optical scanning holography, can solve the problems of indivisible images, image jaggedness, inaccurate self-focusing position, etc., and achieve the effect of simple implementation, elimination of influence, and easy operation

Inactive Publication Date: 2019-06-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The literature "Extended focused imaging and depth map reconstruction in opticalscanning holography" uses the minimum entropy of each pixel on the neighborhood to construct a depth map, thereby achieving self-focusing on each pixel, but the size of the neighborhood will cause self-focusing inaccurate position, causing aliasing in the reconstructed image
[0005] The literature "Enhanced Autofocusing in Optical Scanning Holography Based on Hologram Decomposition" uses the method of image segmentation to enhance the autofocus accuracy of the minimum entropy method, and uses the method of image segmentation to eliminate the defocus noise in the process of holographic reconstruction, but it is not suitable for a closer image Object, which has the problem that the image cannot be segmented

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  • A self-focusing and reconstruction method for optical scanning holography based on connected domains
  • A self-focusing and reconstruction method for optical scanning holography based on connected domains
  • A self-focusing and reconstruction method for optical scanning holography based on connected domains

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Embodiment

[0052] The basic structure adopted by the embodiment of the present invention is as figure 1 Shown, where the wavelength of light waves λ = 632.8nm, convex lens (L 1 and L 2 ) with a focal length of 75mm, and the distance from the X-Y scanning galvanometer to the double-layer slice is z 1 = 14mm, z 2 =15mm, the scanned object such as figure 2 As shown, the slice size used is 1mm×1mm, and the sampling pixels are 512×512.

[0053] An embodiment of the present invention provides a self-focusing and reconstruction method of optical scanning holography based on connected domains, and the specific steps are as follows:

[0054] Step 1. First, the frequency is ω 0 After passing through the first pupil and the first convex lens, the light beam forms a plane wave with frequency ω 0 The beam of +Ω passes through the second pupil and the second convex lens to form a spherical wave; then, the two beams of light waves pass through the beam splitter and interfere to form a Fresnel zo...

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Abstract

The invention proposes a self-focusing and reconstruction method of optical scanning holography based on connected domains, belongs to the field of optical scanning holography technology and image reconstruction, and mainly solves the problem of holographic reconstruction in optical scanning holography. The invention uses the method of connected domains to mark the image of the hologram and obtain the area of ​​the image area, and realizes the self-focusing and reconstruction of the hologram through the law of area change. The invention effectively realizes the holographic reconstruction in the optical scanning holography, and the image reconstruction method is applicable to various fields.

Description

technical field [0001] The invention belongs to the fields of optical scanning holography and image reconstruction, and in particular relates to a self-focusing and reconstruction method of optical scanning holography based on connected domains. Background technique [0002] Optical scanning holography, referred to as OSH, uses point-by-point scanning to store three-dimensional objects in the form of two-dimensional digital images. Compared with general digital holography, it scans point by point, so its resolution is not limited by digital devices. Limiting, meanwhile, its obtained holograms without interference-induced speckle noise. Since the technology was proposed, it has been applied in many fields, such as: scanning holographic microscope, 3D image recognition and 3D optical remote sensing and other fields. [0003] The reconstruction of holograms has always been a research hotspot in the field of holography, and so far, a lot of related work has been done. In the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T11/00G06T7/11G06T7/187G06T7/62G06K9/46
CPCG06T7/11G06T7/187G06T7/62G06T11/00G06T2207/20056G06V10/457
Inventor 欧海燕吴勇邵维王秉中
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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