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High-quality binary stripe generation method based on multi-objective optimization jitter algorithm

A multi-objective optimization and binary fringe technology, which is applied in measurement devices, genetic models, genetic laws, etc., can solve problems such as projector nonlinearity, and achieve the effects of balancing measurement accuracy, increasing 3D measurement speed, and improving measurement accuracy.

Inactive Publication Date: 2020-05-12
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

[0005] The present invention is just an improvement made for the technical problems proposed by the prior art, and provides a high-quality binary fringe based on a multi-objective optimization dithering algorithm that can improve the three-dimensional measurement speed, solve the nonlinear problem of the projector, and improve the measurement accuracy. generate method,

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  • High-quality binary stripe generation method based on multi-objective optimization jitter algorithm
  • High-quality binary stripe generation method based on multi-objective optimization jitter algorithm
  • High-quality binary stripe generation method based on multi-objective optimization jitter algorithm

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Embodiment 1

[0091] In order to solve the problem of time-consuming calculation, the objective function of the above formula (4) is used to optimize a binary block to replace the optimization of the entire binary fringe pattern, and then use the periodicity and symmetry of the sinusoidal fringe to convert the binary block to form a complete pattern. Assuming that the ideal fringe pattern changes sinusoidally in the x direction, the binary fringes to be optimized should not only have periodicity and symmetry in the x direction, but also have periodicity in the y direction, figure 1 is a flowchart of an optimization framework that replaces the entire binary fringe pattern by optimizing a binary block, and its main steps are described as follows:

[0092] (1) Determine the individual dimension of the population. The binarization size is initialized to S y ×S x , where S y = 1, S x =T / 2 is half a stripe period, and the population individual is determined to have a length of S y ×S x A o...

Embodiment 2

[0103] In order to solve the problem of time-consuming calculation, the objective function of the above formula (4) is used to optimize a binary block to replace the optimization of the entire binary fringe pattern, and then use the periodicity and symmetry of the sinusoidal fringe to convert the binary block to form a complete pattern. Assuming that the ideal fringe pattern changes sinusoidally in the x direction, the binary fringes to be optimized should not only have periodicity and symmetry in the x direction, but also have periodicity in the y direction, figure 1 is a flowchart of an optimization framework that replaces the entire binary fringe pattern by optimizing a binary block, and its main steps are described as follows:

[0104] (1) Determine the individual dimension of the population. The binarization size is initialized to S y ×S x , where S y = 1, S x =T / 2 is half a stripe period, and the population individual is determined to have a length of S y ×S x A o...

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Abstract

The invention discloses a high-quality binary stripe generation method based on a multi-objective optimization jitter algorithm. Y provides an optimization objective function; the function is used foroptimizing binary blocks, so that the optimization of the whole binary stripe pattern can be replaced; the periodicity and symmetry of sine stripes are utilized; and the binary blocks are spliced into a complete pattern. A binary coding technology is adopted, so that three-dimensional measurement speed is greatly increased, so that high-speed three-dimensional measurement can be carried out. An out-of-focus binary coding technology is used, so that the nonlinear problem of a projector is solved. A multi-objective optimization framework based on a genetic algorithm is provided. Through the multi-objective optimization technology, on the basis of the genetic algorithm framework, a phase optimization objective and a gray value optimization objective are combined, and therefore, the precisionof three-dimensional measurement is greatly improved, the measurement precision of a traditional jitter algorithm is improved, and the problems of measurement precision and sensitivity to defocusingamounts are effectively balanced.

Description

technical field [0001] The invention relates to the field of three-dimensional shape measurement, in particular to a method for generating high-quality binary fringes based on a multi-objective optimized dithering algorithm. Background technique [0002] With the development of digital projection technology, three-dimensional surface measurement technology based on digital projection has been widely used in many occasions, but it is difficult for this technology to perform high-speed and high-quality three-dimensional shape measurement at the same time. [0003] (1) The measurement speed is limited. The traditional digital fringe projection technology uses 8-bit sinusoidal phase shift fringes, and the measurement speed will be restricted by the refresh rate of the projector (≤120Hz). [0004] (2) Measurement accuracy is limited. Digital fringe projection technology often uses commercial projectors as its projection equipment, and commercial projectors have obvious nonlinea...

Claims

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Application Information

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IPC IPC(8): G01B11/25G06N3/12
CPCG01B11/254G06N3/126
Inventor 林斌蔡宁
Owner ZHEJIANG UNIV
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