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Time multiplexing structured light coding and decoding method

An encoding and decoding method and time multiplexing technology are applied in the field of computer vision three-dimensional measurement and calculation, which can solve the problem of large image processing capacity, and achieve the effect of improving encoding and decoding efficiency and reducing the number of

Active Publication Date: 2022-07-29
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]The purpose of the present invention is to overcome the problem of large amount of image processing in the high-speed three-dimensional measurement scene of the prior art, and to provide a time-multiplexed structured light encoding and decoding method

Method used

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  • Time multiplexing structured light coding and decoding method
  • Time multiplexing structured light coding and decoding method
  • Time multiplexing structured light coding and decoding method

Examples

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Effect test

Embodiment 1

[0043] A time multiplexing structured light codec method, such as figure 1 shown, including the following steps:

[0044] S1, cyclically project a sequence diagram to the object to be tested, where the sequence diagram includes a four-step phase-shift fringe diagram and M structured light coding diagrams, so that in the pattern sequence generated after the cyclic projection, two of the four-step phase-shift fringe diagrams are The phase-shifted fringe pattern is separately arranged in the structured light encoding pattern EP m Before and after, and the phase difference of the two phase-shift fringe patterns before and after is π, the other two phase-shift fringe patterns in the four-step phase-shift fringe pattern are arranged separately in the structured light encoding map EP. m+1 before and after; where, 1≤m<M;

[0045] Specifically, the four-step phase-shift fringe pattern includes I 1 , I 2 , I 3 and I 4 , each fringe pattern is represented by the following formula: ...

Embodiment 2

[0095] This example uses the multi-gray gray code method combined with the four-step phase shift technology, adopts the four-gray gray code, and generates the corresponding time multiplexing sequence through the four gray levels of light, light gray, dark gray and dark. Figure 5 As shown, the loop is projected onto the surface of the measured object. The number of fringe periods is 16, and the number of projected Gray codes is 2 (GL 1 , GL 2 ), the specific steps to restore the phase of the measured object are as follows:

[0096] In the first step, according to the relevant steps of Embodiment 1, the truncation phase φ(x, y, n) is calculated.

[0097] The second step is to use the aid of the four-gray gray code method to calculate the phase order:

[0098] For a total of M Gray code patterns of N gray levels, the calculation formula of the phase order k(x, y) calculated by decoding is as follows:

[0099]

[0100] Among them, V(x,y) represents the decimal decoded code...

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Abstract

The invention relates to the field of computer vision three-dimensional measurement calculation, in particular to a time multiplexing structured light encoding and decoding method, which comprises the following steps: S1, circularly projecting a sequence diagram to an object to be measured, the sequence diagram comprising a four-step phase shift fringe diagram and M structured light encoding diagrams, and enabling the M structured light encoding diagrams to be in a pattern sequence generated after circular projection, two phase-shift fringe patterns in the four-step phase-shift fringe patterns are separately arranged in front of and behind the structured light coding pattern EPm, the phase difference between the front and rear phase-shift fringe patterns is pi, and the other two phase-shift fringe patterns are separately arranged in front of and behind the structured light coding pattern EPm + 1; wherein mlt is greater than or equal to 1; m; s2, calculating background light intensity by using two phase shift fringe patterns in front of and behind the structured light coding pattern; s3, calculating a truncation phase by using the background light intensity; and S4, calculating the level by using the structured light coding pattern EPm and multiplexing M-1 structured light coding patterns closest to the structured light coding pattern EPm, and unwrapping the truncation phase into a continuous phase. According to the invention, the number of projection structured light coding graphs is reduced, and the coding and decoding efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of computer vision three-dimensional measurement and calculation, in particular to a time multiplexing structured light encoding and decoding method. Background technique [0002] In recent years, the phase-shift fringe measurement technology has been widely used in the field of computer vision measurement and calculation due to its advantages of cost, high precision, good real-time performance, and strong anti-interference ability. The general method of measurement is: project the phase-shift fringe pattern and one or more coding patterns on the surface of the object to be measured, and capture the projection image with a camera at a certain angle to the projection direction; calculate the truncated phase through the phase-shift algorithm , the coding pattern marks each cycle of the truncation phase, the auxiliary truncation phase is expanded into a continuous phase, and finally the phase information is converted int...

Claims

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Application Information

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IPC IPC(8): G01B11/25G06T7/521
CPCG01B11/254G06T7/521
Inventor 吴周杰王浩然张启灿郭文博陈正东李训仁
Owner SICHUAN UNIV
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