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A preprocessing method for sea wave information inversion in a navigation radar image

A marine radar and preprocessing technology, which is applied in the field of marine radar image information processing, can solve problems such as low efficiency, achieve high calculation efficiency, good preprocessing effect, and improve speed and efficiency

Active Publication Date: 2019-05-28
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

Ji Shunying et al. [5] used median filtering to preprocess sea ice radar monitoring images, but the efficiency was also very low

Method used

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  • A preprocessing method for sea wave information inversion in a navigation radar image
  • A preprocessing method for sea wave information inversion in a navigation radar image
  • A preprocessing method for sea wave information inversion in a navigation radar image

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specific Embodiment approach

[0035] Such as figure 1 As shown, a preprocessing method for inversion of sea wave information in nautical radar images includes the following steps:

[0036] S1, transforming the marine radar image from the polar coordinate system to the plane coordinate system;

[0037] S2, using the Laplacian convolution to retain the high-brightness gray value of the same-frequency interference noise position, and reduce the gray value of the sea clutter information;

[0038] S3, using the gray-scale segmentation threshold to quickly segment the same-channel interference noise;

[0039] S4, using the linear interpolation method to perform noise reduction processing on the same-frequency interference noise, the calculation formula is as follows:

[0040]

[0041] Among them, m is the distance between the nearest non-noise point on the left side of the noise point and the noise, and n is the corresponding distance on the right side;

[0042] S5, using the Otsu algorithm and the area th...

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Abstract

The invention discloses a preprocessing method for sea wave information inversion in a navigation radar image. The method comprises the following steps of transforming the navigation radar image froma polar coordinate system to a plane coordinate system; carrying out convolution by adopting a Laplace operator, keeping a high-brightness gray value of a same-frequency interference noise position, and reducing the gray value of the sea clutter information; quickly segmenting the same-frequency interference noise by adopting a gray segmentation threshold value; carrying out noise reduction processing on the same-frequency interference noise by adopting a linear interpolation method; adopting an Otsu algorithm and an area threshold method to quickly extract target information which needs to besmoothed and is displayed as highlight spots; and adopting a linear interpolation method to carry out smoothing processing on the result image, finally converting a processed result to a polar coordinate system, and outputting a preprocessing result. According to the preprocessing method for sea wave information inversion in the navigation radar image, the sea wave information inversion preprocessing speed and the efficiency are improved.

Description

technical field [0001] The invention relates to a method for processing navigational radar image information, in particular to a preprocessing method for inversion of sea wave information in the navigational radar image. Background technique [0002] The wave image in the original image of the marine radar is the basis for inversion of sea surface wind field, oil spill, sea ice, red tide / enteromorpha, etc. However, the original image of marine radar contains other information such as co-channel interference, speckle noise, false target noise, ships, islands, etc. How to preprocess these information while retaining the wave information is the primary task of marine radar wave image application . [0003] Zhu [1] 、Liu [2] and Xu [3] et al. only preprocessed the same-frequency interference noise of marine radar before using marine radar for oil spill monitoring, and the algorithm efficiency was low. Shen Lilan [4] The wavelet transform is used to preprocess the sea oil sp...

Claims

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Application Information

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IPC IPC(8): G06T7/136G06T5/00
Inventor 徐进赵阳廉静静鲁峰
Owner DALIAN MARITIME UNIVERSITY
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