Phase unwrapping method based on colored phase shift stripe secondary encoding

A technology of color coding and secondary coding, applied in measuring devices, instruments, and optical devices, etc., can solve the problems that the interference fringe pattern cannot be solved well, and the calculation speed and accuracy cannot be well balanced, so as to shorten the data processing time. Time, fast package speed, and the effect of reducing errors

Inactive Publication Date: 2012-07-25
XI AN JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the phase unwrapping method still faces two difficulties: 1. The calculation speed and accuracy cannot be well balanced; 2. The interference fringe pattern with serious noise cannot be solved well

Method used

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  • Phase unwrapping method based on colored phase shift stripe secondary encoding
  • Phase unwrapping method based on colored phase shift stripe secondary encoding
  • Phase unwrapping method based on colored phase shift stripe secondary encoding

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] A phase unwrapping method based on secondary coding of color phase shift fringes, comprising the following steps:

[0037] The first step is to use Matlab software to combine the same period and the same amplitude, but adjacent stripes have The three sinusoidal fringe patterns of the phase difference are superimposed to produce color phase shift fringes. The grating fringes whose light intensity changes according to the sinusoidal law are generated by the software. The formula for generating the sinusoidal fringe pattern is

[0038] I ( u , v ) = I m 2 [ 1 + cos ( 2 πfu + δ ) ...

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Abstract

The invention relates to a phase unwrapping method based on colored phase shift stripe secondary encoding. The method comprises the following steps of: firstly generating a colored phase shift stripe, projecting the colored phase shift stripe onto the surface of a measured object, collecting a deformation phase shift stripe graph, transmitting deformation phase shift stripe image data to a computer, utilizing Matlab software to divide the deformation phase shift stripe graph into three phase shift gray level images, solving the phase distribution of the deformation phase shift stripe graph, further solving the wrapping phase of the object, then utilizing the color and luminous intensity alternating rule to realize a first time of colored encoding, carrying out secondary encoding on the basis of the first time of encoding in the sequence of red, green and blue, stipulating that three colored encoding stripes generated by the colored phase shift stripe is a cycle of a stripe graph, encoding the stripes with a two-digit number, wherein the cycle, in which the deformation stripe falls, is represented by encoding of respective regions, and adopting a method of respectively counting the numbers of stripes of each color to determine the cycle number of the stripe in the graph and solve the true phase, thereby reducing the data matching error and promoting the unwrapping speed.

Description

technical field [0001] The invention relates to the field of photoelectric detection of three-dimensional contours of objects, in particular to a phase unwrapping method based on secondary encoding of color phase shift fringes. Background technique [0002] The actual phase distribution obtained by phase measurement technology in three-dimensional profile measurement has a corresponding functional relationship with the profile of the measured object, and the required three-dimensional information of the measured object can be obtained by using the phase relationship. The current profile measurement method based on phase measurement uses the arctangent function to calculate the wrapped phase, and the obtained phase value is between -π and +π, so in order to restore the continuous phase distribution, the wrapped phase must be unwrapped. [0003] Specifically, let φ(x, y) be the wrapped phase (φ(x, y)∈[-π, +π]), and Φ(x, y) be the real phase, then: [0004] Φ(x,y)=φ(x,y)+2π·n(...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
Inventor 李兵刘丙才李宝鹏王沙威蒋庄德
Owner XI AN JIAOTONG UNIV
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