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An Order Lossless Correction Method for Coded Structured Light

A technology of coding structured light and correction method, applied in the field of optical three-dimensional measurement, can solve problems such as the order error of coding structured light, and achieve the effect of increasing the measurement range and reducing the computing power

Active Publication Date: 2020-03-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method for order lossless correction of coded structured light. The present invention solves the problem of order errors existing in coded structured light, and is also applicable to the order noise correction link of static and dynamic tests. See the description below for details. :

Method used

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  • An Order Lossless Correction Method for Coded Structured Light
  • An Order Lossless Correction Method for Coded Structured Light
  • An Order Lossless Correction Method for Coded Structured Light

Examples

Experimental program
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Embodiment 1

[0038] An order lossless correction method for coded structured light, see Figure 1-Figure 8 , the method includes the following steps:

[0039] 101: Build a structured light three-dimensional measurement system composed of a projection system and a camera;

[0040] 102: Obtain the wrapping phase of the normal grating order and the wrapping phase obtained by changing the phase shift order by the phase shift method (a basic algorithm in the field of projection measurement, which will not be described in detail in the embodiment of the present invention) and And extract the jump position D of the two groups of wrapped phases respectively 1 and D 2 , and then determine the position P to be corrected by the method of intersecting 1 ;

[0041] Wherein, in step 102, assume that the grating sequence of normal grating order is (I 1 , I 2 , I 3 ,...,I n ), that is, they are arranged in descending order; the grating sequence that changes the phase shift order is (I 2 , I 3...

Embodiment 2

[0058] The embodiment of the present invention shows the corrected measurement results for static objects, combined below figure 1 , Figure 7 and Figure 8 Further introduction to the specific calibration process:

[0059] 201: if figure 1 As shown in , the structured light three-dimensional measurement system composed of projection system, camera, and measured object is assembled and constructed into a triangulation relationship;

[0060] Among them, in the actual experiment process, the angle between the projection system, the camera, and the measured object can be freely adjusted according to the field of view and accuracy requirements. The embodiment of the present invention does not limit this, only figure 1 Take the positional relationship and angle in , as an example to illustrate.

[0061] 202: Phase-coding that will belong to the coding structured light class [2] The two groups of stripes with Gray-code (Gray code) are projected onto the measured object in turn...

Embodiment 3

[0066] The embodiment of the present invention shows the correction measurement results to the dynamic hand shape (only a single frame is shown), combined below figure 1 , Figure 9 and Figure 10 Further introduction to the specific calibration process:

[0067] 301: If figure 1 As shown, the structured light three-dimensional measurement system composed of projection system and camera is assembled, and the object to be measured is placed in the measurement system.

[0068] For specific requirements on the positional relationship and angular relationship among the projection system, the camera, and the object to be measured, refer to Embodiment 2, which will not be described in detail in this embodiment of the present invention.

[0069] 302: Project two sets of stripe sequences belonging to the phase-coding of the coded structured light onto the hand, and the following can be obtained: Figure 9 The reconstruction results shown;

[0070] Depend on Figure 9 As shown, t...

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Abstract

The invention discloses an order non-destructive correction method for encoding structured light. The method comprises: a structured light three-dimensional measurement system formed by a projection system and a camera is constructed; a parcel phase of a normal grating sequence and parcel phases phi1 and phi2 obtained by changing a phase shift sequence are obtained by a phase shift method, jump positions D1 and D2 of the two groups of parcel phases are extracted respectively, and then a position P1 needing correction is determined by an intersection calculation method; an absolute phase valuephi(x, y) is obtained by an unpacking operation and the absolute phase value phi(x, y) is processed by using a phase comparison method to correct an order value at the phase jump point P1; and order noises that are not processed are searched by eight-neighborhood traverse and the order values of the order noises are corrected by using a neighborhood phase comparison method. Therefore, an order error problem existing in the encoding structured light is solved; and the order non-destructive correction method is applicable to the order noise correction link for static and dynamic testing.

Description

technical field [0001] The invention relates to error correction of three-dimensional measurement, and belongs to the technical field of optical three-dimensional measurement, in particular to an order lossless correction method of coded structured light. Background technique [0002] Optical 3D measurement has the characteristics of non-contact measurement and high precision. As a branch of optical measurement, coded structured light has been widely used in scientific research and commercial applications in industrial inspection, human-computer interaction, 3D printing and other industries in recent years due to its simple structure and high robustness. [0003] The coded structured light system consists of the measured object, projection equipment, acquisition camera and computer processing system. During the measurement process, the projector needs to project two sets of different digital rasters on the surface of the object. The raster image modulated by the object sur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/25
CPCG01B11/2504
Inventor 邓吉李健封皓曾周末
Owner TIANJIN UNIV