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Hull surface corrosion degree evaluation method based on image processing

An image processing and ship hull technology, which is applied in the field of image processing to improve the enhancement effect and accurately evaluate the degree of corrosion.

Active Publication Date: 2022-08-02
HUANGHAI SHIPBUILDING
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The invention provides a method for evaluating the corrosion degree of the hull surface based on image processing to solve the existing problems

Method used

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  • Hull surface corrosion degree evaluation method based on image processing
  • Hull surface corrosion degree evaluation method based on image processing
  • Hull surface corrosion degree evaluation method based on image processing

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Embodiment 1

[0059] Embodiment 1 of the method for evaluating the corrosion degree of ship hull surface based on image processing of the present invention is as follows: figure 1 As shown, the method includes:

[0060] S1. Acquire a surface image of the bottom of the hull. Specifically, an underwater camera is used to collect the surface image of the bottom of the hull.

[0061] S2. Since the surface image collected underwater is prone to blurring, it is necessary to enhance the surface image, specifically, downsample the surface image, specifically, use the image pyramid to downsample the surface image to obtain the Gaussian pyramid and the Lapp Laplacian pyramid, in which, in order to be able to restore images with higher resolution, the Laplacian pyramid is obtained according to the information lost in the downsampling process.

[0062] Specifically, the formula for calculating the Laplacian image of each layer of the Laplacian pyramid:

[0063]

[0064] In the formula, Represent...

Embodiment 2

[0104] like figure 2 As shown, this embodiment is based on steps S1-S4 of Embodiment 1, and on the basis of step S4 of Embodiment 1, in order to reduce data redundancy due to excessive layers, thereby reducing the amount of calculation, the present invention also includes : S41, calculate the enhancement effect of the final enhanced image corresponding to each layer of Gaussian image according to the brightness value of each pixel in the final enhanced image corresponding to each layer of Gaussian image; The number of layers calculates the sampling complexity of the surface image; S43, determines the optimal number of layers of the Gaussian pyramid according to the sampling complexity corresponding to the surface image and the enhancement effect of the final enhanced image of the corresponding Gaussian image of each layer; S44, according to the optimal layer Obtain the best Gaussian pyramid of the surface image, that is, record the Gaussian pyramid with the best number of lay...

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Abstract

The invention relates to the technical field of image processing, in particular to a hull surface corrosion degree evaluation method based on image processing, which comprises the following steps: acquiring a surface image of the bottom of a hull, and acquiring a Gaussian pyramid and a Laplacian pyramid according to the surface image, and obtaining enhanced images of the first image enhancement, the second image enhancement and the third image enhancement corresponding to each layer of Gaussian image, and fusing the three enhanced images corresponding to the Gaussian image to obtain a final enhanced image. According to the final enhanced image corresponding to the last layer of Gaussian image of the Gaussian pyramid, the corrosion degree of the hull surface is evaluated, the enhancement effect of the surface image is improved, and the corrosion degree of the hull is accurately evaluated.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method for evaluating the corrosion degree of ship hull surface based on image processing. Background technique [0002] Ship hulls are all made of metal materials, and metal materials in seawater are often affected by seawater temperature, atmosphere and seawater salinity, which often lead to surface corrosion of the hull. The aging of the surface material causes fatigue fracture, which affects the navigation. Different degrees of corrosion have different effects on the hull, so it is of great significance to evaluate the degree of corrosion on the surface of the hull. [0003] The accuracy of evaluating the degree of corrosion in the underwater area of ​​​​the hull mainly depends on the quality of the underwater image. Due to the phenomenon of refraction and scattering of light in the underwater propagation, the image taken underwater will be affected, and the presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/30G06T5/50G06T7/00G06T7/11
CPCG06T5/30G06T5/50G06T7/0004G06T7/11G06T2207/20021G06T2207/20221G06T2207/30136Y02A90/30
Inventor 柴建华王婉婷沙丙强
Owner HUANGHAI SHIPBUILDING
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