Digital holographic harmonic detection and elimination method based on spectral energy

A digital hologram and spectrum energy technology, applied in the field of digital holography, can solve the problems of difficult to determine the filtering range, easy loss of object and light information, and increase the amount of calculation, so as to achieve accurate elimination of harmonic components, reduce calculation burden, and increase calculation speed Effect
CN106949968AInactive Publication Date: 2017-07-14CHINA UNIV OF PETROLEUM (EAST CHINA)
3 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Publication Date
2017-07-14
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention belongs to the field of digital holography, and discloses a digital holographic harmonic detection and elimination method based on spectrum energy. The method includes six steps to complete the processing of an image with harmonic interference, which are Fourier transform of the image, search of a harmonic spectrum, readout of coordinates and a complex value of the harmonic spectrum, calculation of the frequency and interference intensity coefficient of harmonics in horizontal and vertical directions and the initial phase, construction of harmonic distribution using parameters, and image correction. The method of the invention only utilizes the energy relationship between the zero-order Fourier transform spectrum and the harmonic spectrum without the need to design a filter; the acquisition of the range of harmonics corresponding to the spectrum is not required; no impact will be exerted on the information of the original light; an inverse Fourier transform is not required on the spectrum; and after the harmonic parameters are obtained using the energy relationship, the harmonic intensity distribution is constructed, the harmonic is eliminated by direct subtraction and the calculation is simple.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of digital holography, and in particular relates to a method for detecting and eliminating harmonics of a digital hologram based on spectrum energy. Background technique

[0002] When using digital holographic technology for microscopic imaging or precision measurement, the quality of digital hologram has a great influence on the quality of restored image or measurement accuracy. The existence of laser speckle, reference light tilt, and harmonics will greatly reduce imaging quality or measurement accuracy. . Digital holography requires the interference of object light and reference light to record the interferogram. Compared with ordinary photography, more optical components are required in the recording path, such as beam splitters, beam combiners, and spatial filters. When light waves pass through these devices, phenomena such as reflection and refraction will occur on the front and rear surfaces. Light ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More