A Method for Ship Wake Detection in Complicated Background SAR Images

A technology with complex background and detection method, which is applied in the field of detection of ship wakes in synthetic aperture radar images, can solve the problems of ship wake detection in SAR images, etc., and achieve the removal of complex textures, enhancement of ship wake areas, and robustness Effect

Inactive Publication Date: 2017-02-15
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcoming of prior art, the object of the present invention is to provide a kind of complex background SAR image ship wake detection method, solve the ship wake detection problem of SAR image under complex background

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  • A Method for Ship Wake Detection in Complicated Background SAR Images
  • A Method for Ship Wake Detection in Complicated Background SAR Images
  • A Method for Ship Wake Detection in Complicated Background SAR Images

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Embodiment 1

[0054] The process flow of the complex background SAR image ship wake detection method disclosed in this embodiment is as follows: figure 2 shown, including:

[0055] Step S11: enhancing the contrast of the SAR image, and obtaining the structural components of the image through morphological component analysis technology.

[0056] First, the histogram equalization is performed on the SAR image, and the image contrast is enhanced, and then the enhanced image is subjected to morphological component analysis (Morphological Component Analysis, MCA) to separate the structural components and texture components of the image. The complex background SAR image X can be regarded as a linear combination of structural components S, texture components T and residual R mainly speckle noise, as follows:

[0057] X=S+T+R (1)

[0058] It can be seen that the unique S and T cannot be obtained from X without limitation. However, starting from the sparse representation theory of signals, the s...

Embodiment 2

[0081] Experiments show that, using the MCA technology in Example 1 to decompose the complex background SAR image structure-texture, there may be a large number of non-wake area edges in the obtained structural components, which cover the edges of the ship wake itself; Wavelet transform and acquisition of low-frequency components—equivalent to smoothing structural components—although it can remove more edges of non-wake areas, it also weakens the edges of ship wakes and increases the amount of calculation for subsequent gradient image binarization . Therefore, the method disclosed in this embodiment has been improved for these problems, and the new detection process is as follows: image 3 shown, including:

[0082] Step S21: Enhance the contrast of the SAR image, and obtain the structural components of the image through the relative full variation regularization technique.

[0083] First, histogram equalization is performed on the original SAR image to enhance image contras...

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Abstract

Provided is a complicated background SAR image naval ship tail track detection method. Firstly, morphological component analysis or relative total variation regularization is carried out on an SAR image, and the image is decomposed into a texture component representing a complication sea surface and a structure component containing naval ship tail tracks; then image enhancement is carried out on the structure component and thresholding is carried out on a gradient image, and accordingly a binary image of a naval ship tail track area is formed; finally, radon transformation or Hough transformation linear detection is carried out on the enhanced naval ship tail track area, inversion is carried out in a conversion domain, and continuous tail tracks and related parameters are obtained. Structure and texture decomposition is carried out on the SAR image, and influences of speckle noise and complicated textures on naval ship tail track detection are eliminated; image enhancement is carried out on the structure component, binaryzation is carried out on the gradient image, and the naval ship tail track area is further highlighted.

Description

technical field [0001] The invention relates to the field of detection of ship wakes in synthetic aperture radar (Synthetic Aperture Radar, SAR) images, in particular to a method for detecting ship wakes in complex background SAR images. Background technique [0002] SAR is an important imaging device for microwave remote sensing. It actively transmits microwave signals and receives the echoes of ground objects. Since the microwaves emitted in the working frequency band can penetrate clouds and are not affected by weather and sunlight, it can be used for all-weather and all-weather imaging. However, microwave imaging requires the amplitude and phase information of the echo, and the superposition of waves with different phases causes serious speckle noise on the image. Lyden J.D. et al. pointed out that when using SAR to image ships on the sea surface, four types of ship wake images can be obtained, namely turbulent wake, Kelvin (Kelvin) wake, narrow V-shaped wake and ship wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T5/00
Inventor 杨国铮禹晶孙卫东
Owner TSINGHUA UNIV
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