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A method and system for detecting water body regions on synthetic aperture sonar images

A synthetic aperture sonar and area detection technology, which is applied in image enhancement, image analysis, image data processing, etc., can solve the problems of no echo signal and restoration of elevation information, etc. The method is simple and efficient, improves detection accuracy, is accurate and efficient The effect of extraction

Active Publication Date: 2016-08-03
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

The water body area is a dark area near the distance in the SAS image. There is no echo signal in this area, and the elevation information cannot be restored from the interferometric phase.

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  • A method and system for detecting water body regions on synthetic aperture sonar images
  • A method and system for detecting water body regions on synthetic aperture sonar images
  • A method and system for detecting water body regions on synthetic aperture sonar images

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Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] Such as figure 1 As shown, the figure is a schematic diagram of the water body area, H is the height of the InSAS platform, h is the height of the edge of the water body area, θ is the opening angle of the InSAS beam perpendicular to the azimuth plane, and β is the center line of the beam perpendicular to the azimuth plane and the vertical The angle of the direction.

[0037] The specific implementation steps of the water area detection method given in this paper are as follows: image 3 Shown:

[0038] 1. The object of InSAS processing is phase, so the SAS image used for InSAS processing is a complex-valued image. Computes the absolute value of a complex-valued image, resulting in a magnitude map. Calculate the mean value of the amplitude of each point in the image pair, and set a group of arithmetic queues as the threshol...

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Abstract

The present invention provides a method and system for detecting a water body area on a synthetic aperture sonar image, the method comprising: using two receiving arrays to generate two synthetic aperture sonar images of the same area; calculating the amplitude of the two images Mean value, generate a set of threshold sequences according to the amplitude mean value, and use one of them as the current image; select one of the set threshold values ​​as the set threshold value; binarize the current synthetic aperture sonar image according to the set threshold value; The transformed image is marked with connected domains, and the area is grown to obtain the water body area; repeat the above method to obtain the water body area detected by the current image under different thresholds; and select the other image of the two images as the current image to repeat the above method ; Obtain the difference between the water body regions detected by the two images when the threshold is the same, and use these differences as a standard to evaluate the water body region results, and select the best evaluated water body region results as the water body region detection results.

Description

technical field [0001] The invention relates to the field of synthetic aperture sonar signal processing, in particular to a method and system for detecting water body regions on synthetic aperture sonar images. Background technique [0002] Synthetic Aperture Sonar (Synthetic Aperture Sonar, SAS) is a high-resolution underwater two-dimensional imaging technology. The Interferometric Synthetic Aperture Sonar (InSAS) is an extension of SAS. It uses two receiving arrays to perform SAS imaging on the target scene, and uses the phase difference between the two images to obtain elevation information. The phase of the SAS image is important information for InSAS processing. [0003] Affected by geometric relationships and underwater topography, there are shadows, overlapping and water body areas in SAS images. The echo signals in these areas are weak or the echoes in different areas overlap with each other, which destroys the phase of the SAS image and reduces the quality of the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T5/50
Inventor 秦晓东刘纪元
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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