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A Method of Generating Grating Stripes for 3D Measuring Based on Programmable Controller

A programming controller and grating stripe technology, applied in measuring devices, instruments, optical devices, etc., can solve the problems of inconvenient computer carrying, low interface specificity, troublesome operation, etc., and achieve strong specificity, convenient operation, and portable convenient effect

Active Publication Date: 2020-12-22
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In practical engineering applications, the computer is inconvenient to carry, the cost is high, and its interface has low specificity and troublesome operation

Method used

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  • A Method of Generating Grating Stripes for 3D Measuring Based on Programmable Controller
  • A Method of Generating Grating Stripes for 3D Measuring Based on Programmable Controller
  • A Method of Generating Grating Stripes for 3D Measuring Based on Programmable Controller

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Embodiment

[0028] A kind of specific embodiment of the present invention is, a kind of generation method of three-dimensional measurement grating stripe based on programmable controller, its steps are as follows:

[0029] A. Pre-writing of sinusoidal brightness vector:

[0030] The brightness value of K pixels x 1 ,x 2 ,...,x k ,...x K , forming a sinusoidal brightness vector X K ,X K ={x 1 ,x 2 ,...,x k ,...x K}; where x k =255sin[π(k-1) / K] is obtained by looking up the table, k is the sequence number of the pixel brightness value in the sinusoidal brightness vector, K is the total number of pixel brightness values ​​in the sinusoidal brightness vector, K=2~256; The programmable controller converts the sinusoidal brightness vector X K Write to the ROM of the programmable controller;

[0031] B. Generation of grating stripe image

[0032]The programmable controller reads the corresponding sinusoidal brightness vector X in the ROM according to the value of the total number K ...

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Abstract

The invention discloses a method for generating three-dimensional measurement grating stripes based on a programmable controller. The steps are as follows: A. Pre-writing of sinusoidal brightness vectors: the sinusoidal brightness value x is obtained by looking up the table k =255sin[π(k‑1) / K], forming a sinusoidal brightness vector X K ,X K ={x 1 ,x 2 ,...,x k ,...x K} and written in the ROM of the programmable controller; B, the generation of the grating stripe image: the VGA module obtains the brightness value of the nth stripe in the grating stripe image and then obtains the grating stripe image Z under the control of the pixel clock signal, The programmable controller sends the grating stripe image Z to the VGA module; C, projection. The method can use a programmable controller to generate the fringe grating required for three-dimensional measurement in real time on site, avoids carrying a heavy and expensive computer, is easy to carry, saves labor during on-site three-dimensional measurement, has strong specialization, is convenient to operate, and has low measurement cost.

Description

technical field [0001] The invention relates to a method for generating grating stripes for three-dimensional measurement. Background technique [0002] The grating fringe is composed of a large number of equal-width parallel fringe lights with equal intervals and regular changes. For example, the sinusoidal grating fringes are a series of parallel fringe lights whose intensity varies according to the sinusoidal law, and the Roche grating fringes are a series of fringe lights whose intensity varies according to the square wave. Fringe Projection Profilometry (Fringe Projection Profilometry, FPP) is a technology that uses grating stripes to measure the contour of an object (three-dimensional measurement); its principle and steps are: (1) use a projection device to project a series of fringe lights at equal intervals onto A completely flat reference plane, and then use a camera to shoot and record the grating fringes on the reference plane to obtain the reference image of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/25G06T7/521
CPCG01B11/2531G01B11/254G06T7/521
Inventor 周鸣语李金龙杨凯张渝彭朝勇彭子洳高晓蓉王勇罗林
Owner SOUTHWEST JIAOTONG UNIV