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Double-frequency simulation coding light fault-tolerant phase expansion engineering method

A phase unwrapping and analog coding technology, applied in the field of coded light three-dimensional measurement, can solve the problems of phase jump, complex unwrapping algorithm, phase value measurement error, etc., to achieve the effect of easy calculation and avoid gross measurement errors

Inactive Publication Date: 2015-02-25
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0006] For this reason, combining two analog coded lights for visual three-dimensional measurement has become a trend in the development of structured light. However, when two analog coded lights are combined for phase unwrapping, there is not only the phase jump problem caused by the phase value measurement error within the cycle, but also the There is also the problem of limited expansion range or complex expansion algorithm

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  • Double-frequency simulation coding light fault-tolerant phase expansion engineering method
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  • Double-frequency simulation coding light fault-tolerant phase expansion engineering method

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing and specific embodiment the present invention will be further described:

[0034] 1. Derivation of ideal model of phase unwrapping

[0035] During the measurement, the phase unwrapped value Y is the final unknown quantity to be requested; a 1 and a 2 is a known quantity initially set; k 1 and k 2 is the unknown quantity in the process; Indicates the phase of a certain cycle of analog code 1, Indicates the phase of a certain cycle of the analog code 2, and Obtained by measurement.

[0036] build mathematical models, express , and k 1 , k 2 The relationship is obtained by solving the mathematical model k 1 , k 2 , and then obtained by formula (3) or formula (4) Y .

[0037] In view of the above problems, the analysis figure 1 middle k 1 ,k 2 and , The positional relationship along the horizontal axis forms the corresponding relationship in Table 1. because , then every , figure 1 T...

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Abstract

The invention provides a double-frequency simulation coding light fault-tolerant phase expansion engineering method. According to the method, double-frequency simulation codes are composed of a simulation code 1 and a simulation code 2, the cycle length a1 of the simulation code 1 and the cycle length a2 of the simulation code 2 are set to be positive integers, a2 is equal to a1+1, and calculating is facilitated; according to the relation, a1 and a2 are zoomed with the same proportion, and the double-frequency simulation codes with any cycle length can be achieved. In the phase expanding process, a fault-tolerant engineering model is utilized for obtaining a phase expansion value, and the influence on the phase expansion value from the most error-prone simulation code cycle ordinal number is avoided. In the whole measuring space, errors, caused by errors of the simulation code cycle ordinal number, of the phase expansion value are corrected, measurement gross errors are avoided, and namely, the measurement gross errors caused by image information extraction errors are avoided.

Description

(1) Technical field [0001] The invention relates to the field of coded light three-dimensional measurement, in particular to a dual-frequency analog code phase unfolding method and a fault-tolerant method in the field. (2) Background technology [0002] Visual 3D measurement is the most effective way to obtain 3D information of objects, and it can be used in medicine, archaeology, clothing, sculpture and other industries for 3D measurement. In the visual three-dimensional measurement technology, the coded light method has the advantages of low cost, high resolution and fast speed and is the most practical. The coded light method greatly improves the measurement speed by projecting coded patterns and has more application prospects. [0003] Coded light includes spatial coding and time coding. The decoding of the former depends on the information of several pixels in the neighborhood where the pixel is located, so its sampling density is low, the anti-interference ability is p...

Claims

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Application Information

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IPC IPC(8): G01B11/25
Inventor 于晓洋于双吴海滨于舒春孙晓明王洋王北一
Owner HARBIN UNIV OF SCI & TECH
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