Adaptive Ship Detection for Single-Look Complex SAR Images Based on SVWIE-Noncircularity Decomposition.

Adaptive Ship Detection for Single-Look Complex SAR Images Based on SVWIE-Noncircularity Decomposition.
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基于SVWIE-非圆度分解的单视复杂SAR图像自适应船舶检测

DOI:
10.3390/s18103293
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发表时间:
2018-09-30
期刊:
Sensors (Basel, Switzerland)
影响因子:
--
通讯作者:
Liu P
Liu P
中科院分区:
其他
文献类型:
--
作者:
Zhao YH;Liu P

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在本文中,我们提出了一种针对单视复杂合成孔径雷达(SAR)图像的自适应船舶检测方法。首先,对非圆度进行分析,并在船舶检测任务中采用;此外,还提出了相似方差加权信息熵(SVWIE)来减少杂波和增强目标。根据SVWIE和非圆性的散射分析,提出了SVWIE-非圆性(SN)分解方法。基于分解,获得两个分量,即高非圆度SVWIE振幅(h)和低非圆度SVWIE振幅(l)。我们证明了 SAR 图像中的船舶和杂波对于 h 探测器来说是不同的,并且 h 探测器可以有效地用于船舶检测。最后,为了从背景中提取船舶,使用广义伽玛分布(GD)来拟合杂波统计量,并利用恒定误报率(CFAR)来选择自适应阈值。该方法的性能在 Alos-2 图像的 HH 偏振上得到了证明。实验结果表明,该方法能够准确检测复杂背景下的船舶,即靠近小岛或强噪声的船舶。
In this paper, we present an adaptive ship detection method for single-look complex synthetic aperture radar (SAR) images. First, noncircularity is analyzed and adopted in ship detection task; besides, similarity variance weighted information entropy (SVWIE) is proposed for clutter reduction and target enhancement. According to the analysis of scattering of SVWIE and noncircularity, SVWIE-noncircularity (SN) decomposition is developed. Based on the decomposition, two components, the high-noncircularity SVWIE amplitude (h) and the low-noncircularity SVWIE amplitude (l), are obtained. We demonstrate that ships and clutter in SAR images are different for h detector and h detector can be effectively used for ship detection. Finally, to extract ships from the background, the generalized Gamma distribution (GΓD) is used to fit h statistics of clutter and the constant false alarm rate (CFAR) is utilized to choose an adaptive threshold. The performance of the proposed method is demonstrated on HH polarization of Alos-2 images. Experimental results show that the proposed method can accurately detect ships in complex background, i.e., ships are close to small islands or with strong noise.
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