舰船尾迹SAR图像特征的谱分析研究

图像纹理在频率空间的分布具有规律性,可以通过对图像进行频谱分析来提取纹理特征。根据SAR成像机理对舰船尾迹SAR图像进行了仿真研究,采用周相谱法对图像的二维功率谱作一维变换处理,提出基于归一化能量谱的图像谱特征分析方法,并给出了不同探测参数下尾迹SAR图像谱特征的仿真图。结果表明,该方法可有效地消除海面背景的影响,实现舰船尾迹特征检测的定量分析。

Study on the spectrum analysis of SAR image characteristic of ship wake

The distribution of image texture in frequency domain obeys some rule,so the texture feature can be extracted by analyzing the frequency spectrum of the image.Simulation of SAR image of ship wake is studied according to the mechanism of SAR imaging.Circular spectrum is adopted to transform the 2-D spectrum of SAR image into 1-D form and the method which is based on the unity energy spectrum is put forward to analyze the image spectrum characteristic.The simulations of the spectrum characteristic of ship wake in SAR image under different detecting parameters are also given.Results show that the proposed method in this paper could eliminate effectively the effects of different ocean background,and compared with traditional image processing methods,it is also effective for analyzing quantificationally the characteristic detection of ship wake.