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Recording method for virtual point spread function of coded aperture related holography

A technology of diffusion function and coded aperture, which is applied in the direction of instruments, etc., can solve problems such as difficult recording and low optical power of light source

Active Publication Date: 2021-09-10
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the light power of small-sized point sources is low, making it difficult to record

Method used

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  • Recording method for virtual point spread function of coded aperture related holography
  • Recording method for virtual point spread function of coded aperture related holography
  • Recording method for virtual point spread function of coded aperture related holography

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Embodiment 1

[0020] combine figure 1 The apparatus shown further illustrates the invention.

[0021] figure 1 It is a device diagram of a specific embodiment, which includes a monochromatic LED (1), a first lens (2), a pinhole (3), a second lens (4), a polarizer (5), a sample tank (6), and a PSLM (7), CMOS image sensor (8). A monochrome LED (1), a first lens (2), a pinhole (3), and a second lens (4) form a light source system. The distance from the monochrome LED (1) to the first lens (2) is d1, and the distance from the first lens (2) to the pinhole (3) is d2. The focal length of the first lens (2) is f1. d1, d2, f1 satisfy d1 -1 +d2 -1 =f1 -1 . The focal length of the second lens (4) is f, and the output from the second lens (4) is a collimated light beam. PSLM(7) load CPM k . The first lens (2) is a microscope objective lens with NA=0.3. The center wavelength of the monochromatic LED (1) is 620nm.

[0022] Step 1: By changing the diameter of the pinhole (3), the spatial coh...

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Abstract

The invention discloses a recording method for a virtual point spread function of a coded aperture related holography, and belongs to the field of computational imaging and coded imaging. When the point spread function of the coded aperture related holography is recorded, the imaging distance and the spatial resolution of the point spread function are restricted by the size and the power of a point light source. According the recording method of the invention, the wavefront of the point light source is simulated through a wavefront modulator, corresponding intensity distribution is recorded, and the intensity distribution is called the virtual point spread function. The virtual point spread function and a real point spread function have an approximate intensity distribution mode, and the virtual point spread function can replace the real point spread function to carry out image reconstruction. Compared with classic coded aperture correlation holography, the method has higher spatial resolution capability and farther reconstruction distance.

Description

technical field [0001] The invention relates to a virtual point spread function recording method of coded aperture correlation holography, which belongs to the fields of computational imaging and coded imaging, and in particular relates to the field of recording point spread functions through wavefront modulation. Background technique [0002] In the field of imaging, holography has attracted much attention because of its ability of stereoscopic imaging and quantitative depth measurement. Traditional holography uses laser light as a light source and is also disturbed by speckle noise. Therefore, various incoherent holography techniques have been proposed, including coded aperture correlation holography (Coded aperture correlation holography, COACH). During the working process of COACH, it is necessary to record N point spread functions (the point spread function refers to the point spread function of intensity), and synthesize a point spread hologram from the N point spread ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/00G03H1/04
CPCG03H1/0005G03H1/0443G03H1/0402G03H2001/026G03H2001/0413G03H2001/0436G03H1/06
Inventor 于雪莲王康维李秀芳杨思敏柴承汜潘立辉闫顶
Owner HARBIN UNIV OF SCI & TECH