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Side-scan sonar image statistical enhancement algorithm based on boundary constraint

A boundary-constrained, side-scan sonar technology, applied in image enhancement, calculation, image data processing and other directions, can solve problems such as poor image gain effect, and achieve the effect of eliminating poor gain effect and solving poor image resolution

Active Publication Date: 2022-07-08
国家海洋局北海海洋技术保障中心 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a statistical enhancement algorithm for side scan sonar images based on boundary constraints. Provides high image quality in case of poor gain

Method used

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  • Side-scan sonar image statistical enhancement algorithm based on boundary constraint
  • Side-scan sonar image statistical enhancement algorithm based on boundary constraint
  • Side-scan sonar image statistical enhancement algorithm based on boundary constraint

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Embodiment 1

[0031] The segmentation area of ​​the side-scan sonar image is a part of the image taken from the overall image. The image taken from the side-scan sonar image will result in a relatively concentrated overall pixel range and poor image resolution. The acquired image may not be gain corrected, or After gain correction, the effect of gain correction is not ideal. This algorithm uses the longitudinal statistical law of side-scan sonar as a constraint, and can solve this problem under a unified framework.

[0032] figure 1 is the image directly captured from the side scan sonar image in this embodiment. figure 1 is uncorrected by the original gain, image 3 Yes figure 1 The characterization function of , combining figure 1 and image 3 , it can be seen that the difference between the target and the background is small, the recognition degree is not high, the overall pixel range of the image is relatively concentrated, the background pixels are not uniform and have large discre...

Embodiment 2

[0047] Figure 5 is the image directly captured from the side scan sonar image in this embodiment. Figure 5 is uncorrected by the original gain, Figure 7 Yes Figure 5 The characterization function of , combining Figure 5 and Figure 7 , it can be seen that the difference between the target and the background is small, the recognition degree is not high, the overall pixel range of the image is relatively concentrated, the background pixels are not uniform and have large discrepancies, and the pixel part involved in the target object is not very different from the background pixels, which leads to The image quality is poor and the image resolution is low, which causes certain difficulties for image segmentation and target recognition.

[0048] Image 6 is the image processed by this algorithm, Figure 8 Yes Image 6 The characterization function of , contrast Figure 5 and Image 6 ,As can be seen, Image 6 The quality of the picture is obviously improved, the gain...

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Abstract

The invention belongs to the technical field of side-scan sonar image enhancement algorithms, and relates to a side-scan sonar image statistical enhancement algorithm based on boundary constraint. The algorithm is mainly suitable for a side-scan image with relatively consistent background field image reflection intensity in a unified area, an original image representation function is made through original image statistical analysis, a corrected image is obtained by constructing a feature correction function, the overall pixel of the corrected image is stretched through a linear stretching function, and the image reflection intensity of the background field image is relatively consistent. And a representation function of the stretched image is solved, and the corrected image is adjusted and corrected through boundary condition constraints, so that a high-quality image is finally obtained. According to the algorithm, the longitudinal statistical law of the side-scan sonar is used as a constraint condition, gray balance can be carried out on the side-scan sonar image, and the situation that the gain effect of a traditional gain method on part of images is poor can be eliminated.

Description

technical field [0001] The invention relates to the technical field of side-scan sonar image enhancement algorithms, in particular to a side-scan sonar image statistical enhancement algorithm based on boundary constraints. Background technique [0002] Side-scan sonar images have a wide range of applications in the fields of underwater geological and landform survey, target search, obstacle detection, and inversion of 3D marine models. Especially due to the increase in the density of torpedoes and mines in important strategic channels in recent years, the demand for side-scan sonar image segmentation and target recognition is also growing. High-quality side-scan sonar images are of great significance to national defense activities such as underwater torpedo detection and identification of enemy underwater reconnaissance equipment. [0003] At present, the segmentation areas of side-scan sonar images are all partial images cut out from the overall image, resulting in extreme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T5/007
Inventor 刘大川马龙张莹吴少林马治忠孟祥恩宋晓晓
Owner 国家海洋局北海海洋技术保障中心
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