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A fault-tolerant encoding and decoding method for complex surface-encoded light measurements

An encoding and decoding method and a technology for complex surfaces, applied in the field of encoding and decoding methods and their ability to resist complex surface interference, can solve problems such as measurement gross errors, image information extraction errors, etc., so as to improve the ability to resist complex surface interference and avoid measurement gross errors. , The effect of avoiding the wrong position of the measured point coding space

Inactive Publication Date: 2017-09-22
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0009] The purpose of the present invention is to overcome the insufficiency of coarse measurement error caused by the image information extraction error caused by complex surface interference in the process of combining Gray code and phase shift in three-dimensional measurement, and to provide a fault-tolerant encoding and decoding method that can resist complex surface interference

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  • A fault-tolerant encoding and decoding method for complex surface-encoded light measurements
  • A fault-tolerant encoding and decoding method for complex surface-encoded light measurements
  • A fault-tolerant encoding and decoding method for complex surface-encoded light measurements

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Embodiment Construction

[0023] Below in conjunction with accompanying drawing and specific embodiment the present invention will be further described:

[0024] 1. Coding Basis

[0025] figure 2 Shown is the positional relationship between the Gray code and the phase shift, and only a part of the Gray code and the phase shift are shown in the figure. If the true value of the phase shift at a point A is , regardless of whether the Gray code value is wrong or not, as long as ( for the actual measured value), that is ), then the kp obtained according to formula (1) will not be affected. in interval inside, taking into account the true value of the phase shift phase The measurable range and fault tolerance range, then take the edge E at place, The measurable range is , the tolerance range is .

[0026] When the gray code start point and the phase shift start point differ In this case, the anti-interference ability is the strongest, that is, the Gray code is only on both sides of...

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Abstract

The invention provides a fault-tolerant coding and decoding method for complicated surface coded light measurement. During coding, the phase shift period length 1p is two times of the Gray code period length 1g through setting, namely (shown in description); a phase shift starting point Op lags behind a Gray code starting point Og through setting (shown in description). During decoding, a measured point coding space position is calculated in a fault-tolerant mode, and the influence of a Gray code value error to the measured point coding space position is avoided. By adopting the method, image information extraction errors caused by complicated surface interference are avoided, accordingly measurement gross errors are avoided, and the complicated surface interference resisting capacity of coded light three-dimensional measurement is improved.

Description

technical field (1) Technical field [0001] The invention relates to the field of coded light three-dimensional measurement, in particular to a codec method in the field and its ability to resist complex surface interference. (2) Background technology [0002] The coded light three-dimensional measurement method in the field of visual measurement has the comprehensive advantages of measurement accuracy and measurement efficiency (speed). Point cloud data of the measured surface. Among them, the role of coded light is to divide the measurement space. [0003] Compared with simple surfaces, complex surfaces have more colors, higher reflectivity, and larger geometric slopes. In the process of coded light measurement, the complex surface interferes with the coded light, so there are errors in the captured image information, which leads to coarse measurement errors. Therefore, an error-tolerant encoding and decoding method with strong anti-interference ability on complex surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/25
Inventor 吴海滨于晓洋于双王北一孟晓亮孙晓明
Owner HARBIN UNIV OF SCI & TECH
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