Nonlinear phase error correcting method based on digital projection three-dimensional measuring system

A nonlinear phase, three-dimensional measurement technology, applied in the field of projection measurement, can solve the problems of high phase error and inaccurate data, and achieve the effect of small phase error, accurate test data and convenient use

Pending Publication Date: 2019-07-09
SHENZHEN ESUN DISPLAY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this active phase correction method can easily calculate the gamma correction factor of the projection measurement system, the phase error after correction is still high, the data is not accurate enough, and it still cannot meet the actual measurement needs

Method used

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  • Nonlinear phase error correcting method based on digital projection three-dimensional measuring system
  • Nonlinear phase error correcting method based on digital projection three-dimensional measuring system
  • Nonlinear phase error correcting method based on digital projection three-dimensional measuring system

Examples

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Effect test

no. 1 example

[0054] Set the actual fringe phase shift step number as N=3; the phase shift step number of the selected phase error fringe pattern is N′=4, and the computer generates N stripes whose space period is M according to the pixel cycle M=t×N×N′ ×N′ step phase shift fringe pattern, the coefficient t is a positive integer, and the fringe pattern {I m} onto a flat whiteboard, and collect the actual phase shift fringe pattern formed

[0055] The phase-shifted fringe pattern acquired The k-th phase-shift fringe image in is the starting point, and a fringe image is extracted every interval t N′ phase-shift fringe images, and a total of N fringe images are extracted to form the N-step phase-shift fringe atlas of the k-th group The actual phases of N′ groups of N-step phase-shifted fringe patterns are calculated respectively by the method of least squares and the ideal phase of the corresponding fringe space period M then pass

[0056] Get the corresponding phase error Then g...

no. 2 example

[0061] Set the actual fringe phase shift steps as N=3, and the projected fringe periods are 36, 36, 30, and 36 pixels respectively; the phase shift steps of the selected phase error fringe pattern are N'=3, 4, 5, 6 ; The phase-shifting fringe diagram {I m}, the coefficient t is a positive integer, wherein N×N′ is 9, 12, 15 and 18 respectively, and the phase shift fringe pattern {I m} onto a flat object, and collect the actual phase shift fringe pattern after formation

[0062] The phase-shifted fringe pattern acquired The k-th phase-shift fringe image in is the starting point, and a fringe image is extracted every interval t N′ phase-shift fringe images, and a total of N fringe images are extracted to form the N-step phase-shift fringe atlas of the k-th group The actual phases of N′ groups of N-step phase-shifted fringe patterns are calculated respectively by the method of least squares and the ideal phase under the corresponding phase shift steps actual phase Subt...

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Abstract

The invention discloses a nonlinear phase error correcting method based on a digital projection three-dimensional measuring system. The system comprises the steps of setting a stripe space period as M, setting an actual stripe phase shifting step number as N, setting a phase shifting step number of a phase error stripe pattern as N', setting t as a coefficient, generating an NXN' step phase shifting stripe pattern by a computer according to the stripe pixel period M= tXNXN', projecting the stripe pattern onto a white board by the three-dimensional measuring system, and collecting an actual phase shifting stripe pattern; extracting the collected phase shifting stripe pattern, obtaining N' groups of N step phase shifting stripe patterns, calculating actual phases and corresponding NXN' stepideal phases, obtaining phase errors, and obtaining N' phase error patterns; and calculating the amplitude of the phase shifting stripe pattern by a least square algorithm, calculating a numerical value of a gamma correction factor of each pixel according to a relation between the amplitude and the gamma correction factor, correcting the original stripe pattern generated by the computer accordingto the gamma correction factor, and projecting the corrected phase shifting stripe pattern by adopting the three-dimensional measuring system to perform three-dimensional reconstruction.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of projection measurement, in particular to a method for correcting nonlinear phase errors based on a digital projection three-dimensional measurement system. [0003] 【Background technique】 [0004] At present, there are endless methods of gamma correction factor correction for projection measurement systems, which can be roughly divided into passive phase correction methods and active phase correction methods. The passive phase correction method mainly includes a statistical model, a lookup table model, and an iterative model. It is a method to calculate the package phase by using the distorted fringe image actually collected and perform phase compensation on the package phase. However, the passive phase correction method is easily affected by the environment. lead to inaccurate test results. In order to overcome the above defects, a three-step phase shift method is usually used to construct a pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25G06T17/00
CPCG01B11/2504G06T17/00
Inventor 陈海龙李成彭翔刘梦龙何懂
Owner SHENZHEN ESUN DISPLAY
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