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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, computing, image data processing, etc., can solve problems such as poor image gain effect, and achieve the effect of eliminating poor gain effect and poor image resolution

Inactive Publication Date: 2021-12-10
国家海洋局北海海洋技术保障中心 +1
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  • 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 segmented area of ​​the side-scan sonar image is a part of the image cut out from the overall image. The image cut from the side-scan sonar image will result in a relatively concentrated pixel range of the whole image, poor image resolution, and the acquired image may not have been corrected by gain, or After gain correction, but the effect of gain correction is not satisfactory. This algorithm uses the longitudinal statistical law of side scan sonar as a constraint condition, and can solve this problem under a unified framework.

[0032] figure 1 is the image directly intercepted from the side-scan sonar image in this embodiment, and in this embodiment figure 1 is uncorrected by the original gain, image 3 yes figure 1 The characterization function, combined with 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 concent...

Embodiment 2

[0046] Figure 5 is the image directly intercepted from the side-scan sonar image in this embodiment, and in this embodiment Figure 5 is uncorrected by the original gain, Figure 7 yes Figure 5 The characterization function, combined with 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 pixels involved in the target object are not much different from the background pixels. The poor image quality and low image resolution have caused certain difficulties in image segmentation and target recognition.

[0047] Figure 6 is the image processed by this algorithm, Figure 8 yes Figure 6 The characterization function of Figure 5 and Figure 6 ,As can be seen, Figure 6 The picture quality is significantly improved, the gain effect is obvi...

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Abstract

The invention 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, 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. According to the method, 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 are widely used in underwater geomorphological survey, target search, obstacle detection, and sea 3D model inversion. In particular, due to the increase in the density of torpedoes and mines deployed in important strategic waterways in recent years, the demand for side-scan sonar image segmentation and target recognition has become increasingly strong. 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 extremely low image reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T5/90
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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