Structured light three-dimensional measurement method based on segment quantization phase coding

A technology of phase encoding and three-dimensional measurement, which is applied in the field of three-dimensional measurement to achieve the effects of good robustness, improved accuracy and three-dimensional measurement accuracy, and high measurement accuracy

Active Publication Date: 2017-08-11
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

In addition, the traditional phase encoding method only uses a 1-bit codeword to determine the fringe order

Method used

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  • Structured light three-dimensional measurement method based on segment quantization phase coding
  • Structured light three-dimensional measurement method based on segment quantization phase coding
  • Structured light three-dimensional measurement method based on segment quantization phase coding

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Embodiment Construction

[0023] The implementation of the present invention will be described in further detail below in conjunction with the accompanying drawings, but this example is not intended to limit the present invention, and all similar structures and similar changes of the present invention should be included in the protection scope of the present invention.

[0024] A structured light three-dimensional measurement method based on segmented quantization phase encoding, comprising the following steps:

[0025] (1) Writing sinusoidal stripes

[0026] The actual measurement usually uses the four-step phase shift method for three-dimensional measurement, then the four sinusoidal fringe patterns:

[0027] A n (x,y)=A'(x,y)+A"(x,y)cos[φ 1 (x,y)+π(n-1) / 2] (n=1,2,3,4)

[0028] Among them, A'(x,y) is the average brightness, A"(x,y) is the modulation brightness, φ 1 (x,y) is the phase to be sought. Generate A 1 (x,y), A 2 (x,y), A 3 (x,y), A 4 (x,y) four sinusoidal fringe images, such as fi...

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Abstract

The present invention discloses a structured light three-dimensional measurement method based on segment quantization phase coding. The method comprises three key portions consisting of the quantization phase coding principle, the segment phase coding principle and the three-dimensional measurement principle. The method is characterized in that: (1) compared to a traditional sine fringe and phase coding fringe projection method, the method provided by the invention perform modulation of quantization coding phases through a special coding sequence, and the decoding accuracy of a special coding rule is greatly improved; (2) the method allows the modulated quantization coding phases to be embedded into 3 coding fringes, and uses continuous 3-bit code words to determine the level of the current period fringe to greatly improve the accuracy of the fringe level and the three-dimensional measurement precision; and (3) according to the actual measurement precision, the method can generate many code words, is high in measurement precision and good in robustness, and has potential application prospects and practical values in the three-dimensional measurement of a complex object, a large object and an object with single color.

Description

technical field [0001] The invention relates to a three-dimensional measurement method, in particular to a three-dimensional measurement method of structured light projection with subsection quantization phase encoding. Background technique [0002] Structured light projection profilometry is of great significance in three-dimensional measurement due to the advantages of non-contact, high precision, lossless measurement in the whole field, fast measurement speed, high sensitivity and high degree of automation. 3D measurement systems such as figure 1 As shown, it includes DLP projector 1, black and white CCD 2, workstation 3, measurement support 4, reference plane 5 and object 6 to be measured; DLP projector 1 and black and white CCD 2 are placed on measurement support 4; DLP projector 1 and black and white CCD 2 are respectively The workstation 3 is connected through a data line; the object to be measured 6 is placed on the reference plane 5; the workstation 3 includes an i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
CPCG01B11/254
Inventor 伏燕军王霖王凤丽韩旭夏桂锁方利华
Owner NANCHANG HANGKONG UNIVERSITY
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