Decoding algorithm for n-frequency coding structured light

A technology of encoding structured light and decoding algorithm, which is applied in the field of three-dimensional measurement of structured light, can solve the problem that the decoding method is not applicable to multi-frequency encoded structured light

Inactive Publication Date: 2015-08-26
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that the existing decoding method is not suitable for multi-frequency coded structured light, the present invention discloses an n-frequency coded structured light decoding algorithm, which is not only suitable for decoding dual-frequency coded structured light, but also suitable for multi-frequency coded structured light Encoding structured light for decoding

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  • Decoding algorithm for n-frequency coding structured light
  • Decoding algorithm for n-frequency coding structured light
  • Decoding algorithm for n-frequency coding structured light

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specific Embodiment 1

[0028] The decoding algorithm for n-frequency coded structured light in this embodiment takes dual-frequency as an example to verify that the method is suitable for decoding dual-frequency coded structured light.

[0029] The dual-frequency coded structured light of this embodiment has periods of 6 and 7 respectively, namely: a 1 = 6, a 2 =7; it can be seen that the combination of the two has a range of 42. According to the disclosed method of the present invention, comprise the following steps:

[0030] S1. Calculate the number of cycles of the n-frequency coded structured light within the range

[0031] N 1 =T / a 1 =42 / 6=7

[0032] N 2 =T / a 2 =42 / 7=6

[0033] S2. Calculate the phase principal value corresponding to the spatial position x and The calculated results are respectively;

[0034]

[0035]

[0036] S3, construct an array

[0037] in:

[0038] no 1 = 0, 1, 2, 3, 4, 5, 6

[0039] no 2 = 0, 1, 2, 3, 4, 5

[0040] S4. Calculate the array A in ...

specific Embodiment 2

[0087] The n-frequency encoded structured light decoding algorithm in this embodiment still takes dual-frequency as an example, and it is verified that the method is suitable for decoding dual-frequency encoded structured light.

[0088] The dual-frequency coded structured light of this embodiment also has periods of 6 and 7, namely: a 1 = 6, a 2 =7; the combination of the two, the range is 42. Compared with the specific embodiment, the decoding algorithm is exactly the same in steps S1, S2, S3 and S4. In step S5, since the array A with equal element values ​​is found, the corresponding element value is 37.5, so 37.5 is The value of the spatial position x.

[0089] In the above two embodiments, if the spatial position is calculated according to the method disclosed in the invention patent "a dual-frequency analog coded optical fault-tolerant phase unfolding engineering method" previously applied by the research group, or according to the invention patent "based on the same d...

specific Embodiment 3

[0093] The n-frequency coded structured light decoding algorithm in this embodiment takes four-frequency coded structured light as an example to verify that the method is suitable for decoding multi-frequency coded structured light.

[0094] The four-frequency coded structured light in this embodiment has periods of 4, 5, 6 and 7, namely:

[0095] a 1 =4

[0096] a 2 =5

[0097] ;

[0098] a 3 =6

[0099] a 4 =7

[0100] It can be seen that the combination of the four has a range of 420. According to the disclosed method of the present invention, comprise the following steps:

[0101] S1. Calculate the number of cycles of the n-frequency coded structured light within the range

[0102] N 1 =T / a 1 =420 / 4=105

[0103] N 2 =T / a 2 =420 / 5=84

[0104] N 3 =T / a 3 =420 / 6=70

[0105] N 4 =T / a 4 =420 / 7=60

[0106] S2. Calculate the phase principal value corresponding to the spatial position x The calculated results are respectively;

[0107]

[0108] ...

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Abstract

The invention discloses a decoding algorithm for n-frequency coding structured light, and belongs to the technical field of structured light three-dimensional measurement. The decoding algorithm comprises the following steps: firstly, computing the periodicity of the n-frequency coding structured light within a measurement range, and then computing a phase principal value corresponding to a space position x; secondly, structuring an array and computing the values of the array in all situations; on such basis, searching for an array value of which all elements have the same numerical value, and recording the corresponding periodicity; finally, computing the value of the space position x. The decoding algorithm is applicable to the decoding of not only double-frequency coding structured light but also multiple-frequency coding structured light.

Description

technical field [0001] An n-frequency coded structured light decoding algorithm belongs to the technical field of structured light three-dimensional measurement. Background technique [0002] Three-dimensional shape measurement is widely used in scientific research, medical diagnosis, engineering design, criminal investigation and other fields. As an important part of many three-dimensional shape measurement methods, structured light has attracted extensive attention from scholars and engineers from various countries due to its advantages of non-contact, low cost, high resolution and fast speed, and has developed rapidly. . [0003] Structured light is a set of system structures composed of projectors and cameras. After the specific light information is projected onto the surface of the object and the background by the projector, it is collected by the camera, and the position and depth information of the object are calculated according to the light signal changes caused b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24
Inventor 于晓洋刘爽何宝华王洋于舒春孙晓明赵烟桥
Owner HARBIN UNIV OF SCI & TECH
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