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Gaussian apodization based optical scanning holographic edge detection method

A technology of optical scanning and edge detection, which is applied in the field of optical scanning holography, can solve the problems that diffraction noise is not filtered out and the suppression ratio is not high

Inactive Publication Date: 2015-12-30
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0005] The document "RadialHilberttransform with Laguerre-Gaussianspatialfilters" proposes a method of using Laguerre-Gaussian filtering to suppress the side lobes of vortex beams, which improves the resolution of edge extraction to a certain extent, but the suppression ratio is not high
[0006] The document "ImageedgeenhancementinopticalmicroscopywithaBessel-likeamplitudemodulatedspiralphasefilter" proposes to use a Bessel-like filter to suppress the sidelobe. The effect of suppressing the sidelobe is better than that of Laguerre Gauss, which effectively improves the effect of edge extraction, but it still has less diffraction noise. filtered out

Method used

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Embodiment

[0060] The process of the embodiment of the present invention is as follows figure 1 As shown, the basic structure adopted is as follows figure 2 As shown, the wavelength λ=632.8nm of the He-Ne laser Laser, its output is a Gaussian beam, the beam waist ω s = 3mm, the focal length of the two convex lenses (L1, L2) is 400mm, and the spiral phase plate is realized by a liquid crystal spatial light modulator with 1024×768 pixels (each pixel is 14 μm). image 3 As shown, the size is 1mm×1mm, the matrix size is 256×256, and its axial position z=100mm, the scanning process can be realized according to the following steps:

[0061] Step 1. Forming the Vortex Beam

[0062] like figure 2 As shown, the light with angular frequency ω emitted by the same light source is split into two beams by the first polarizing beam splitter BS1, one of which passes through the first pupil p 1 (x, y) form a vortex light; another beam passes through the second pupil p after the frequency shift of Ω...

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Abstract

The invention provides an improved method which adopts a spiral phase plate to generate vortex beams so as to carry out edge extraction, belongs to the field of optical scanning and image reconstruction, and mainly solves a problem of suppressing the spiral phase plate to diffract side lobes. In an optical scanning holographic system which carries out edge extraction by adopting the spiral phase plate, suppression for the side lobes is realized through reducing the radius of the spiral phase plate, and a frequency domain expression of the corrected vortex beams is provided, thereby improving the resolution of edge extraction. The method provided by the invention effectively improves the resolution of edge extraction, and the side lobe suppressing method is applicable to various fields.

Description

technical field [0001] The invention relates to the fields of optical scanning holography and image reconstruction, in particular to an edge extraction method of optical scanning holographic edge of spiral phase plate based on Gaussian beam apodization. Background technique [0002] Optical scanning holography, referred to as OSH, stores the information of a 3-dimensional object as a 2-dimensional hologram through optical scanning technology. This technique was proposed in 1979 when Poon and Korpel investigated bipolar sequential image processing in their acousto-optic heterodyne image processor. 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] Edge extraction is an important technology in the process of image preprocessing. It belongs to the extraction of the underlying features of the image, and the extraction of the underlying image of the image is als...

Claims

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Application Information

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IPC IPC(8): G03H1/12G03H1/16
Inventor 欧海燕吴勇邵维王秉中
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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