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Three-dimensional measurement method based on binary coding and electronic equipment

A binary coding, three-dimensional measurement technology, applied in the field of three-dimensional measurement, can solve the problems of poor phase resolution accuracy and reliability, and low universality, and achieve the effect of improving the measurement accuracy, improving the accuracy and reducing the phase error.

Active Publication Date: 2021-09-07
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of low universality, poor phase analysis accuracy and reliability in the binary coding method in the existing three-dimensional measurement method, and provide a three-dimensional measurement method and electronic equipment based on binary coding

Method used

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  • Three-dimensional measurement method based on binary coding and electronic equipment
  • Three-dimensional measurement method based on binary coding and electronic equipment
  • Three-dimensional measurement method based on binary coding and electronic equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Such as figure 1 As shown, a three-dimensional measurement method based on binary coding includes the following steps:

[0058] S1: Perform binary encoding on the sinusoidal fringe image by an error diffusion algorithm to obtain an encoded fringe group, and the encoded fringe group meets the requirements of the time phase unwrapping algorithm. The binary encoding process of the error diffusion algorithm mainly includes two parts: threshold quantization and quantization error diffusion. Such as figure 2 As shown, the mechanism of error diffusion is shown, such as image 3 As shown, the error diffusion coding rule adopted by the present invention is shown. in figure 2 with image 3 (a) is eight-bit sinusoidal fringe pattern, and the mathematical expression is:

[0059] The gray scale distribution range of the eight-bit sinusoidal fringe pattern is 0-1;

[0060] The formula of the error diffusion algorithm is as follows, and a fringe pattern with only two values...

Embodiment 2

[0087] This embodiment is an embodiment in which a binary code-based three-dimensional measurement method described in Embodiment 1 is applied to phase measurement profilometry (PMP) of the time phase unfolding method, and the present invention is not limited to the ones involved in the embodiment content.

[0088] The system structure of phase measurement profilometry is as follows: Image 6 shown. When the binary encoded fringes with period p generated by the computer 105 are projected out of focus by the digital projector 102 onto the surface of the object to be measured 104 placed on the reference plane 103, the deformed fringes received by the imaging system 101 can be expressed as:

[0089]

[0090] In the formula, C(x,y) represents the background gray level, and D(x,y) / C(x,y) is the stripe contrast. The phase function φ(x,y) contains the information Z=h(x,y) of the height of the object surface 104 . By projecting N sinusoidal fringes (N>2), each phase shifted by 1...

Embodiment 3

[0105] Such as Figure 10 As shown, an electronic device includes at least one processor, and a memory communicated with the at least one processor; the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor. Execution by at least one processor, so that the at least one processor can execute the three-dimensional measurement method based on binary coding described in the foregoing embodiments. The input and output interfaces may include a display, a keyboard, a mouse, and a USB interface for inputting and outputting data; the power supply is used for providing electric energy for electronic equipment.

[0106] Those skilled in the art can understand that all or part of the steps for implementing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned programs can be stored in computer-readable storage media. The steps of the method ...

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Abstract

The invention relates to the field of three-dimensional measurement, in particular to a three-dimensional measurement method based on binary coding and electronic equipment. According to the invention, binary coding is carried out on the sine fringe image through the error diffusion algorithm, the sine property of the projection image is improved, the fringe group is coded by using the out-of-focus projection, and finally, the collected fringe image reflected by the object to be measured is processed to obtain the three-dimensional data of the object to be measured. Due to the fact that the projection image adopts binary coding and only has two gray values of 0-1, the digital projector is not influenced by nonlinearity, and high-speed and high-precision three-dimensional surface shape measurement is achieved under the limitation of limited frame frequency (120Hz).

Description

technical field [0001] The invention relates to the field of three-dimensional measurement, in particular to a two-value code-based three-dimensional measurement method and electronic equipment. Background technique [0002] The acquisition of three-dimensional information of objects has important practical significance, among which phase measurement profilometry (PMP) has the advantages of simple structure, non-contact, low cost, high precision, fast measurement speed, etc. The field has broad application prospects. [0003] Phase shift profilometry analyzes the fringe phase information and maps it to object space information. According to the absolute phase acquisition method, it is divided into two categories: time phase expansion method and spatial phase expansion method. The spatial phase unfolding method unfolds the phase according to the spatial information, and the quality of the unfolded phase results is related to the selection of the starting point, the unfolding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
CPCG01B11/254
Inventor 朱江平朱昌会周佩
Owner SICHUAN UNIV
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