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Structured light phase decoding method based on double-frequency sawtooth wave

A decoding method, sawtooth wave technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of phase jump, complex phase unwrapping algorithm, phase principal value measurement error, etc., to increase flexibility and save calculation steps , the effect of expanding the scope of application

Inactive Publication Date: 2015-09-09
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Structured light phase decoding method based on double-frequency sawtooth wave
  • Structured light phase decoding method based on double-frequency sawtooth wave
  • Structured light phase decoding method based on double-frequency sawtooth wave

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Experimental program
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specific Embodiment 1

[0048] The structured light phase decoding method based on dual-frequency sawtooth wave in this embodiment is used to verify the effectiveness under the same conditions as the parameters of the "Phase Unwrapping Engineering Method".

[0049] The structured light phase decoding method based on dual-frequency sawtooth wave in this embodiment includes the following steps:

[0050] Step a, projection waveform function is the first sawtooth wave of y1=k1*mod (x, a1)+b1 and the waveform function is the second sawtooth wave of y2=k2*mod (x, a2)+b2 respectively;

[0051] in:

[0052] k1=1, a1=9, b1=0;

[0053] k2=1, a2=10, b2=0;

[0054] x is the spatial position, and mod() is the remainder operation;

[0055] and:

[0056] The starting points of the two sawtooth waves are the same;

[0057] a1 / (a2-a1)=9;

[0058] The graphics drawn according to the parameters of step a are as follows figure 1 shown;

[0059] Step b, according to the given spatial position 38.75, find that sai...

specific Embodiment 2

[0070] The structured light phase decoding method based on dual-frequency sawtooth wave in this embodiment is used to verify the validity when a1 and a2 are not all integers.

[0071] Step a, projection waveform function is the first sawtooth wave of y1=k1*mod (x, a1)+b1 and the waveform function is the second sawtooth wave of y2=k2*mod (x, a2)+b2 respectively;

[0072] in:

[0073] k1=1, a1=9, b1=0;

[0074] k2=1, a2=10.5, b2=0;

[0075] x is the spatial position, and mod() is the remainder operation;

[0076] and:

[0077] The starting points of the two sawtooth waves are the same;

[0078] a1 / (a2-a1)=6;

[0079] The graphics drawn according to the parameters of step a are as follows figure 2 shown;

[0080] Step b, according to the given spatial position 38.75, find that said spatial position 38.75 corresponds to the phase main value phi1 of the first sawtooth wave and the phase main value phi2 of the second sawtooth wave; wherein:

[0081] phi1=mod(38.75,9)=2.75; ...

specific Embodiment 3

[0091] The structured light phase decoding method based on dual-frequency sawtooth wave in this embodiment is used to verify the validity when a1 and a2 are not integers.

[0092] Step a, projection waveform function is the first sawtooth wave of y1=k1*mod (x, a1)+b1 and the waveform function is the second sawtooth wave of y2=k2*mod (x, a2)+b2 respectively;

[0093] in:

[0094] k1=1, a1=8.8, b1=0;

[0095] k2=1, a2=9.9, b2=0;

[0096] x is the spatial position, and mod() is the remainder operation;

[0097] and:

[0098] The starting points of the two sawtooth waves are the same;

[0099] a1 / (a2-a1)=8;

[0100] The graphics drawn according to the parameters of step a are as follows image 3 shown;

[0101] Step b, according to the given spatial position 38.75, find that said spatial position 38.75 corresponds to the phase main value phi1 of the first sawtooth wave and the phase main value phi2 of the second sawtooth wave; wherein:

[0102] phi1=mod(38.75,8.8)=3.55;

...

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Abstract

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

Description

technical field [0001] A structured light phase decoding method based on dual-frequency sawtooth 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 the three-dimensional shape measurement method, structured light has attracted extensive 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 set of system structures composed of projectors and cameras. After the specific light information is projected onto the surface of the object and the background by the projector, it is collected by the camera, and the position and depth information of the object are calculated according to the light signal changes caused by the obj...

Claims

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Application Information

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IPC IPC(8): G01B11/25
Inventor 于晓洋王北一于双吴海滨孙晓明于舒春赵烟桥
Owner HARBIN UNIV OF SCI & TECH