Three-dimensional depth data acquisition method based on frequency optimization jitter algorithm

A technology of dithering algorithm and depth data, applied in image data processing, calculation, calculation model and other directions, can solve problems such as projector nonlinearity, achieve the effect of solving nonlinear problems and improving the speed of 3D measurement

Inactive Publication Date: 2020-05-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention is just an improvement made for the technical problems raised by the prior art, and provides a high-quality binary fringe based on a multi-objective optimiz

Method used

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  • Three-dimensional depth data acquisition method based on frequency optimization jitter algorithm
  • Three-dimensional depth data acquisition method based on frequency optimization jitter algorithm
  • Three-dimensional depth data acquisition method based on frequency optimization jitter algorithm

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Embodiment 1

[0067] In order to solve the problem of time-consuming calculation, the present invention replaces the optimization of the entire binary fringe pattern by optimizing a binary block, and then combines the binary blocks into a complete pattern by utilizing the periodicity and symmetry of sinusoidal fringes. Assuming that the ideal fringe pattern changes sinusoidally in the horizontal direction, the binary fringes to be optimized should not only have periodicity and symmetry in the horizontal direction, but also have periodicity in the vertical direction. figure 1 is a flowchart of an optimization framework for replacing the entire binary fringe pattern by optimizing a binary block based on the frequency domain optimization method; figure 2 It is a visualization process of the key steps in the fringe pattern generation.

[0068] Its main steps are described as follows:

[0069] (1) Determine the individual dimension of the population. The size of the binary block is initialize...

Embodiment 2

[0079] In order to solve the problem of time-consuming calculation, the present invention replaces the optimization of the entire binary fringe pattern by optimizing a binary block, and then combines the binary blocks into a complete pattern by utilizing the periodicity and symmetry of sinusoidal fringes. Assuming that the ideal fringe pattern changes sinusoidally in the horizontal direction, the binary fringes to be optimized should not only have periodicity and symmetry in the horizontal direction, but also have periodicity in the vertical direction. figure 1 is a flowchart of an optimization framework for replacing the entire binary fringe pattern by optimizing a binary block based on the frequency domain optimization method;

[0080] Its main steps are described as follows:

[0081] (1) Determine the individual dimension of the population. The size of the binary block is initialized to S y ×S x , where S y = 1, S x =T / 2 is half a stripe period, and the individual dime...

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Abstract

The invention discloses a three-dimensional depth data acquisition method based on a frequency optimization jitter algorithm. An optimized objective function is provided; a binary block is optimized through the function, so that the optimization of a whole binary stripe pattern can be replaced; and the periodicity and symmetry of sine stripes are utilized. According to the method of the invention,a binary coding technology is adopted; the measurement speed bottleneck of a digital fringe projection technology is broken through; three-dimensional measurement speed is greatly improved; high-speed three-dimensional measurement can be carried out; an out-of-focus binary coding technology is utilized to solve the nonlinear problem of a projector; an optimization framework based on a discrete particle swarm algorithm and an optimization framework based on the discrete particle swarm algorithm are provided; binary fringes are optimized in a frequency domain; and a high-quality binary fringe generation method is provided for a real-time three-dimensional measurement technology.

Description

technical field [0001] The invention relates to the field of three-dimensional shape measurement, in particular to a method for acquiring three-dimensional depth data based on a frequency-optimized dithering algorithm. Background technique [0002] Non-contact 3D shape measurement has been used more and more in the fields of 3D biometrics, online detection, medical modeling and reverse engineering. Among various non-contact three-dimensional shape measurement methods, digital fringe projection technology has won people's favor for its simplicity, reliability and flexibility. Digital fringe projection technology usually projects a series of phase-shifted sinusoidal fringe patterns onto the surface of an object, and then captures the deformed fringe patterns through a camera to obtain the three-dimensional shape information of the object. Because the traditional digital fringe technology uses 8-bit sinusoidal fringes, the measurement speed is often limited by the refresh rate...

Claims

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Application Information

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IPC IPC(8): G01B11/22G01B11/25G06T7/50G06T7/12G06N3/00
CPCG01B11/22G01B11/25G01B11/254G06N3/006G06T7/12G06T7/50G06T2207/10012
Inventor 林斌蔡宁
Owner ZHEJIANG UNIV
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