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Method for constructing sinusoidal grating during three-dimensional optical measurement on basis of three-grayscale spatial pulse width modulation

A space pulse and width modulation technology, applied in the field of optical measurement, can solve the problems of complicated calibration procedures, difficult to completely eliminate the phase error, etc., and achieve the effect of good application prospects.

Inactive Publication Date: 2013-02-06
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The above methods can improve the measurement accuracy to a certain extent, but there are generally the following major problems: (1) need complicated calibration procedures; (2) need additional collection of grating fringe images; (3) need additional post-processing algorithm compensation; (4) It is difficult to completely eliminate the phase error

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  • Method for constructing sinusoidal grating during three-dimensional optical measurement on basis of three-grayscale spatial pulse width modulation
  • Method for constructing sinusoidal grating during three-dimensional optical measurement on basis of three-grayscale spatial pulse width modulation
  • Method for constructing sinusoidal grating during three-dimensional optical measurement on basis of three-grayscale spatial pulse width modulation

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Embodiment Construction

[0016] In the three-dimensional optical measurement of the present invention, the sinusoidal grating construction method based on three-gray-scale space pulse width modulation, the steps are as follows:

[0017] The first step, grating encoding: the grating encoding fringe image is generated by computer, that is, the ideal single-cycle sine wave is first generated by the computer, and its frequency is recorded as f 0 , select the triangular wave carrier frequency f according to the period width of the ideal single-cycle sine wave c ; Then the computer generates a frequency f with π phase difference c The triangle wave, and compare the amplitude of the two triangle waves with the ideal single-cycle sine wave to generate two binary pulse width modulation waves; then make a difference between the two binary pulse width modulation waves to obtain a single-cycle coded image , the final grating fringe image is generated by periodic expansion of the single-period encoded image.

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Abstract

The invention discloses a method for constructing a sinusoidal grating during three-dimensional optical measurement on the basis of three-grayscale spatial pulse width modulation. The method comprises the following steps of: grating coding: a grating coding stripe image is generated through a computer; grating projecting: digital projection equipment is used to project the rating coding stripe image; and projection equipment defocusing: the projection equipment is slightly defocused finally. The projection equipment does not need complicated nonlinear calibration, additional grating strips or a late compensation algorithm is also not needed, hardware facility is not required to be additionally arranged, but the grating stripe image with standard sinusoidal light distribution can be obtained, so that the method is simple and practicable and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of optical measurement, in particular to a sinusoidal grating construction method based on three-gray-scale space pulse width modulation in three-dimensional optical measurement. Background technique [0002] Since the International Optical Society first listed optical three-dimensional sensing as one of the seven main fields and directions of the frontier of information optics, with the development of computer technology, optics and optoelectronic technology, new optical three-dimensional sensing and metrology methods have emerged continuously. The most representative structured light three-dimensional measurement method in the active three-dimensional measurement technology uses different projection devices to project different types of structured light to the measured object, and takes a structured light image that is modulated and deformed by the surface of the measured object. The three-dimensional shap...

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Application Information

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IPC IPC(8): G01B11/25
Inventor 陈钱左超顾国华冯世杰钱惟贤任侃隋修宝何伟基任建乐李如斌申国辰封芳潇雨
Owner NANJING UNIV OF SCI & TECH
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