Phase Decoding Method of Structured Light Based on Dual-frequency Cosine Wave

A decoding method, cosine wave technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of phase jump, phase main value measurement error, complex phase unwrapping algorithm, etc., to expand the scope of application and increase flexibility Effect

Inactive Publication Date: 2017-05-03
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 phase unwrapping algorithm of this type of method is complicated, and in the actual application process, it is found that there will be phase jump problems caused by phase principal value measurement errors

Method used

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  • Phase Decoding Method of Structured Light Based on Dual-frequency Cosine Wave
  • Phase Decoding Method of Structured Light Based on Dual-frequency Cosine Wave
  • Phase Decoding Method of Structured Light Based on Dual-frequency Cosine Wave

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Experimental program
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Effect test

specific Embodiment 1

[0074] The structured light phase decoding method based on the dual-frequency cosine wave of this embodiment is used to verify the validity under the same conditions as the parameters of the "Phase Unwrapping Engineering Method".

[0075] The structured light phase decoding method based on dual-frequency cosine waves of this embodiment is characterized in that it includes the following steps:

[0076] Step a: Project the first cosine wave with the waveform function y1=k1×cos(2πx / a1)+b1 and the second cosine wave with the waveform function y2=k2×cos(2πx / a2)+b2 respectively;

[0077] among them:

[0078] k1=1, a1=9, b1=0;

[0079] k2=1, a2=10, b2=0;

[0080] x is the spatial position;

[0081] and:

[0082] The starting points of the two cosine waves are the same;

[0083] a1 / (a2-a1)=9;

[0084] The graph drawn according to step a parameter is such as figure 1 Shown

[0085] Step b: According to the given space position 38.75, find the main phase value phi1 of the first cosine wave and the main...

specific Embodiment 2

[0104] The structured light phase decoding method based on dual-frequency cosine waves of this embodiment is used to verify the validity when a1 and a2 are not all integers.

[0105] The structured light phase decoding method based on dual-frequency cosine waves of this embodiment is characterized in that it includes the following steps:

[0106] Step a: Project the first cosine wave with the waveform function y1=k1×cos(2πx / a1)+b1 and the second cosine wave with the waveform function y2=k2×cos(2πx / a2)+b2 respectively;

[0107] among them:

[0108] k1=1, a1=9, b1=0;

[0109] k2=1, a2=10.5, b2=0;

[0110] x is the spatial position;

[0111] and:

[0112] The starting points of the two cosine waves are the same;

[0113] a1 / (a2-a1)=6;

[0114] The graph drawn according to step a parameter is such as figure 2 Shown

[0115] Step b: According to the given space position 38.75, find the main phase value phi1 of the first cosine wave and the main phase value phi2 of the second cosine wave correspon...

specific Embodiment 3

[0134] The structured light phase decoding method based on dual-frequency cosine waves of this embodiment is used to verify the validity when a1 and a2 are not integers.

[0135] Step a: Project the first cosine wave with the waveform function y1=k1×cos(2πx / a1)+b1 and the second cosine wave with the waveform function y2=k2×cos(2πx / a2)+b2 respectively;

[0136] among them:

[0137] k1=1, a1=8.8, b1=0;

[0138] k2=1, a2=9.9, b2=0;

[0139] x is the spatial position;

[0140] and:

[0141] The starting points of the two cosine waves are the same;

[0142] a1 / (a2-a1)=8;

[0143] The graph drawn according to step a parameter is such as image 3 Shown

[0144] Step b: According to the given space position 38.75, find the main phase value phi1 of the first cosine wave and the main phase value phi2 of the second cosine wave corresponding to the space position 38.75;

[0145] among them:

[0146] phi1=arccos(cos(2π×38.75 / 8.8))=2.5347;

[0147] Since tan(2π×38.75 / 8.8) <0, cos(2π×38.75 / 8.8) <0, therefore...

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Abstract

The invention discloses a structured light phase decoding method based on a double-frequency cosine wave and belongs to the technical field of structured light three-dimensional measurement. The method comprises: projecting a first cosine wave and a second cosine wave, wherein the first cosine wave has a waveform function of y1 = k1*cos (2[pi]x / a1)+b1 and the second cosine wave has a waveform function of y2 = k2* cos (2[pi]x / a2)+b2; according to a given spatial position X, solving the phase main value phi1 of the first cosine wave and the phase main value phi2 of the second cosine wave; reassigning the phase main value phi1 of the first cosine wave and the phase main value phi2 of the second cosine wave: phi1 = a1*phi1 / (2[pi]), phi2 = a2*phi2 / (2[pi]); solving the difference between the phi1 and the phi2: h = phi1-phi2; solving the period integer of the first cosine wave and the period integer of the second cosine wave contained in the spatial position X, wherein the period integer of the first cosine wave n1 = mod (h, a2) / abs (a1-a2) and the period integer of the second cosine wave n2 = mod (h, a1) / abs (a1-a2); and solving a phase extended value by using n1*a1+phi1 or n2*a2+phi2. The method retains all technical advantages of the methods in the previous inventions and is better in flexibility and specific in algorithm compared with the methods in the previous inventions.

Description

Technical field [0001] A structured light phase decoding method based on dual-frequency cosine waves belongs to the technical field of structured light three-dimensional measurement. Background technique [0002] Three-dimensional shape measurement is widely used in scientific research, medical diagnosis, engineering design, criminal investigation and other fields. As an important part of three-dimensional shape measurement, structured light has attracted wide attention from scholars and engineers from various countries due to its advantages of non-contact, low cost, high resolution and fast speed. [0003] Structured light is a group of system structures composed of a projector and a camera. After the projector is used to project specific light information onto the surface of the object and the background, it is collected by the camera, and the position and depth information of the object is calculated according to the change of the light signal caused by the object, and then the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/25
Inventor 王北一于晓洋张吉勋何宝华吴海滨孙晓明于舒春
Owner HARBIN UNIV OF SCI & TECH
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