A GPR steel bar quantity detection method combined with wavelet decomposition

A technology of wavelet decomposition and detection method, which is applied in image data processing, instruments, calculations, etc., can solve problems such as image confusion, and achieve the effects of simplification of steel bar images, improvement of efficiency, image resolution and recognizability

Active Publication Date: 2019-05-03
NANJING INST OF TECH
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Problems solved by technology

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a method for detecting the number of GPR steel bars combined with wavelet decomposition. By combining wavelet decomposition and digital image processing technology, it overcomes the image problems caused by the mutual stacking of existing steel mesh GPR images Confusion problem, thus quickly obtain information on the number of rebar

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  • A GPR steel bar quantity detection method combined with wavelet decomposition
  • A GPR steel bar quantity detection method combined with wavelet decomposition
  • A GPR steel bar quantity detection method combined with wavelet decomposition

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[0031] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention All modifications of the valence form fall within the scope defined by the appended claims of the present application.

[0032] A GPR steel bar quantity detection method combined with wavelet decomposition is divided into three parts: preprocessing, multi-layer wavelet image decomposition, and steel bar quantity acquisition. The following is the algorithm flow:

[0033] 1) Data preprocessing

[0034] In ground penetrating radar data, the reflected waves caused by radar waves at different interfaces or the noise in the environment will always appear at the same time position in the A-s...

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Abstract

The invention discloses a GPR steel bar quantity detection method combined with wavelet decomposition. The method comprises the following steps that in ground penetrating radar data, reflected waves caused by radar waves in different interfaces or noise in the environment always appear at the same time position in an A scanning image, and clutters can generate a horizontal line in a B scanning image; solving variance of each row of data in the B scanning data two-dimensional matrix, and then only performing a mean value method for suppressing clutter operation on the row with the minimum variance to ensure that the intensity of the steel bar reflected wave is not influenced; processing data obtained by clutter suppression by adopting a wavelet transform method in the step 1; according to the method, the image wavelet decomposition technology is utilized to effectively improve the resolution and the identifiability of the GPR steel bar detection image. And moreover, a large calculationamount method and excessive artificial participation are not used in the calculation process, so that the simplification of the steel bar image is finally achieved, and the efficiency is greatly improved.

Description

technical field [0001] The invention is based on GPR non-destructive detection, relates to digital image processing, and proposes a steel bar quantity extraction method in combination with image wavelet multi-layer decomposition technology. Background technique [0002] Ground Penetrating Radar (GPR) originated in 1904 when the German Hulsmeyer used electromagnetic wave signals to detect underground metal objects. In 1910, Letmbach and Lowy proposed the detection of buried objects using electromagnetic waves in their patent. In 1926, Hulsenbech used pulse wave technology to detect the structure of buried media for the first time, and found that the interface of media with different dielectric constants would produce electromagnetic wave reflection, which became the basic theoretical basis for ground penetrating radar research. In 1929, Stern applied ground penetrating radar to practice to measure the thickness of glaciers. Since then, ground penetrating radar has been main...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCY02P90/30
Inventor 焦良葆曹雪虹田家乐夏天张磊
Owner NANJING INST OF TECH
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