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Improved segmented stepped phase encoding three-dimensional measurement method

A technology of phase encoding and three-dimensional measurement, which is applied in the direction of measuring devices, instruments, and optical devices, etc., can solve problems such as difficult corrections, and achieve the effects of improved decoding accuracy, high measurement accuracy, and good robustness

Active Publication Date: 2020-05-29
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

In addition, the traditional phase encoding fringe order jumps at the edge, which is difficult to correct. However, this invention proposes a complementary fringe level that uses the fringe order after two phase shifts to complement the original fringe level jump. The secondary correction method improves the accuracy of fringe level discrimination

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  • Improved segmented stepped phase encoding three-dimensional measurement method
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  • Improved segmented stepped phase encoding three-dimensional measurement method

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Embodiment Construction

[0050] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the present embodiments are not intended to limit the present invention, and any similar structures and similar changes of the present invention should be included in the protection scope of the present invention.

[0051] A three-dimensional measurement system of an improved segmented step phase encoding three-dimensional measurement method such as figure 1 As shown, it includes a DLP projector 1 , a CCD camera 2 , a computer 3 , a measuring support 4 , a reference plane 5 and an object 6 to be measured. The DLP projector 1 and the CCD camera 2 are placed on the measuring support 4, the DLP projector 1 and the CCD camera 2 are respectively connected to the computer 3 through data lines, the object to be measured 6 is placed on the reference plane 5, and the computer 3 includes an image acquisition card, Projection software, measurement s...

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Abstract

The invention discloses an improved segmented stepped phase encoding three-dimensional measurement method. The method is composed of four key parts including an intermittent stepped phase encoding principle, a segmented phase encoding principle, a complementary fringe order correction principle and a three-dimensional measurement principle. The method has the advantages that the phase instead of the intensity coding mode is used, and the method is insensitive to factors such as contrast of the surface of a measured object, ambient light and camera noise and is good in robustness so that the method can measure objects with different surface brightness degrees; the number of code words is increased through the idea of segmentation, and the height of adjacent steps is increased by designing intermittent step phases so that the measurement precision can be improved, the stripe level after two times of left-right phase shift is used for complementing hopping of the original stripe level, the decoding accuracy is greatly improved, and the method has a certain application prospect in measuring the three-dimensional morphology of a complex industrial product.

Description

technical field [0001] The invention belongs to the field of photoelectric detection, and in particular relates to an improved three-dimensional measurement method of segmented step phase encoding. Background technique [0002] Fringe projection profilometry has the advantages of high speed, high precision, non-contact, full-field non-destructive measurement, and high degree of automation. It has been widely used in 3D measurement in industrial manufacturing, face recognition, biomedicine, virtual reality and many other fields. With the development of science and technology, people have higher and higher requirements for the accuracy of 3D measurement. Through the analysis and research of the current research status and development trends at home and abroad, scholars began to study the type, reflectivity, intensity, and contrast of stripes, expand the measurement range, and solve the problem of unsatisfactory measurement results. Because the method based on phase encoding r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
CPCG01B11/254
Inventor 伏燕军韩勇华张鹏飞倪武桂建楠
Owner NANCHANG HANGKONG UNIVERSITY
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