Extraction method for target highlight in low-resolution high-frequency sonar image
A low-resolution, extraction method technology, applied in image analysis, image data processing, instruments, etc., can solve problems such as inapplicability, and achieve the effect of high applicability, simple extraction method, and accurate extraction results
Inactive Publication Date: 2014-04-09
NAVAL UNIV OF ENG PLA
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Problems solved by technology
Low-resolution sonar images generally do not have speckle noise, so most image filtering methods are not suitable for processing such images
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Embodiment 1
[0056] Embodiment 1: According to the sonar base array, there is a cylindrical small target about 300 meters away, with a maximum dimension of 2 meters. According to formulas (1) and (2), the maximum scales of the target bright spot in the distance and angle dimensions are 4 and 11, respectively, and the signal-mixing ratio threshold is taken as 3.2. According to the method of the present invention from as Figure 4 The target bright spot image extracted from the original sonar image shown is Figure 5 As shown in the figure, three suspected target bright spots are extracted, and the real target bright spots are further identified based on multiple consecutive images.
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The invention belongs to the technical field of sonar image processing, and particularly relates to an extraction method for a target highlight in a low-resolution high-frequency sonar image. The extraction method comprises the steps that the maximum size of the distance dimension and the maximum size of the angle dimension of the target highlight in the sonar image are determined; the signal intensity of each pixel point in the sonar image is calculated; the background intensity of each pixel point in the sonar image is calculated; the echo-to-reverberation ratios of all the pixel points in the sonar image are calculated point by point, and accordingly the sonar image background of each pixel point is determined; after subtraction is conducted between an original sonar image and the sonar image background, the image is scanned point by point, and a target highlight image is obtained. The extraction method is simple, effective, accurate in extraction result and high in applicability, and solves the problem that a small target in the low-resolution high-frequency sonar image is difficult to detect and recognize.
Description
technical field [0001] The invention belongs to the technical field of sonar image processing, and in particular relates to a method for extracting target bright spots in low-resolution and high-frequency sonar images. Background technique [0002] High-frequency imaging sonar performs echo imaging on underwater objects. When the operating frequency of the sonar is not high enough, the resolution of the sonar image is low. The sound shadow area makes it very difficult for the operator to find similar small targets. For high-resolution sonar images, there are many image segmentation methods to extract the shape and size of the target, and then identify underwater targets, but for low-resolution sonar images, there is no disclosure of target bright spot extraction methods. reports. [0003] Reverberation is the inherent interference of active sonar. For high-frequency imaging sonar, the submarine reverberation constitutes the reverberation background of the sonar image. Gene...
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IPC IPC(8): G06T7/00G06K9/46
Inventor 姜可宇蔡志明王超
Owner NAVAL UNIV OF ENG PLA
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