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Method for realizing Fourier transfrom contour by generating pi phase shift by two-colour grating template

A Fourier transform and profilometry technology, which is applied in the field of optical three-dimensional sensing, can solve the problems of limiting the application of Fourier transform profilometry, affecting the real-time performance of Fourier transform profilometry, and long time, etc. Reduced spectral aliasing, easy-to-use effects

Inactive Publication Date: 2007-02-28
SICHUAN UNIV
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Problems solved by technology

[0010] The main methods to complete the π phase shift are: high-precision mechanical phase shift, electronic phase shift, but these phase shift methods need to collect two frames of fringe images in addition to corresponding mechanical or electronic devices, which takes a long time, thus It affects the real-time performance of Fourier transform profilometry and limits the further application of Fourier transform profilometry (FTP).

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  • Method for realizing Fourier transfrom contour by generating pi phase shift by two-colour grating template
  • Method for realizing Fourier transfrom contour by generating pi phase shift by two-colour grating template
  • Method for realizing Fourier transfrom contour by generating pi phase shift by two-colour grating template

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[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings, working principles and embodiments.

[0031] The two-color grating template for realizing π phase shift consists of two groups of fringes with two different colors, the optical transmittance is sinusoidally distributed, and they move half a period from each other. For example, we use red, green, and yellow (R, G, B) three primary colors to form a two-color grating. The transmittance function of this grating is expressed as:

[0032] f(x,y)=a r +b r cos(2πf 0 x)+a g +b g cos(2πf 0 x+π) (1)

[0033] a r and a g are the red and green DC components of the two-color grating, b r and b g for contrast. When making rasters use a r =a g , b r =b g .

[0034] When the two-color grating fringe pattern is projected on the surface of the object to be measured, in the direction forming a certain angle with the projection optical axis, the color image obtain...

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Abstract

The invention is a method for realizing Fourier transformation with two-tone grating math board to generate pai phase shift sine structure light field in three-dimension sensing technology. The match board is made of semi-period stripes with two-tone, and forms the light field whose sine intensity distribution have a pai phasic difference after imaged by the optical imaging system; or use color camera to photo the two-tone grating match board; or uses tiny technology to produce two-tone grating match board. The match board is used in Flourier outline, it needn't any phase shifting device. It can reconstruct the three-dimension surface shape according to the Pai phase shift stripe image.

Description

1. Technical field [0001] The invention relates to optical three-dimensional sensing technology, in particular to a method for generating π-phase-shifted sinusoidal structured light field without any phase-shifting device by using a two-color grating template to realize π-phase-shifting Fourier transform profilometry. 2. Background technology [0002] Three-dimensional object surface profile measurement, that is, three-dimensional surface shape measurement, is of great significance in the fields of machine vision, biomedicine, industrial inspection, rapid prototyping, film and television special effects, product quality control and other fields. Optical three-dimensional sensing technology has been greatly developed due to its advantages of non-contact, high precision, and easy automatic control. Existing optical three-dimensional sensing methods mainly include: triangulation, Moiré Topography (MT for short), Fourier Transform Profilometry (FTP for short), Spatial Phase Dete...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/24G02B27/44G06F17/14G05B19/04
Inventor 苏显渝陈文静曹益平向立群张启灿
Owner SICHUAN UNIV
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