联合超像素分割和显著性特征的 SAR 海洋内波检测. (Chinese)

Ocean internal wave detection in SAR images by combining superpixel segmentation and saliency features. (English)

Ocean internal waves are a commonly observed catastrophic mesoscale oceanic phenomenon, which attracts great attention due to its considerable threat to marine military and marine engineering. With the rapid development of science and technology, the ocean internal wave remote sensing detection method has attracted increasing attention. At present, remote sensing methods used for internal wave observation can be divided into Synthetic Aperture Radar (SAR), visible light, and infrared by frequency band. Among them, SAR has the advantages of all-day, all-weather, and high-resolution, which is especially well-suited for remote sensing investigation of oceanic internal waves with frequent cloud coverage areas. To achieve accurate detection of ocean internal waves using SAR images and to solve the problem that conventional detection algorithms are susceptible to SAR speckle noise interference, this study proposes a SAR ocean internal wave detection algorithm based on superpixel segmentation and global saliency features. First, the SAR image is segmented into feature-uniform superpixels using the Simple Linear Iterative Clustering (SLIC) algorithm. The SLIC algorithm combines neighboring pixels with similar features into superpixels. The superpixels not only enhance the continuity between the inner wave pixels but also suppress the speckle noise interference. Then, the gradient feature, gray scale feature, and spatial feature of the superpixel are used to construct the internal wave saliency feature vector and calculate its global saliency. On the basis of the saliency, the threshold segmentation algorithm is used to extract the internal wave superpixels. Experiments are conducted on GF-3 and ERS-1 images, which show that the constructed internal wave saliency feature vector is beneficial to detect more internal wave stripes. Finally, the label image indicating the internal wave regions is generated in accordance with the spectral characteristics of internal wave and used to correct the internal wave detection result in previous step. We conducted a detection experiment of internal wave bright stripes on five SAR images with a resolution of approximately 10 m. The experimental results show that the proposed method has good detection accuracy for these five high-resolution SAR internal wave images. The average F1 score of the internal wave detection for the five scene experimental data of our method could reach 0.884, and the average false alarm rate is 0.009. By comparing the internal wave detection results and related evaluation indexes of our method with the classical canny operator and the deep learning U-Net method, the effectiveness and robustness of our proposed method in high-resolution SAR ocean internal wave detection are demonstrated, which is cr to improve the inversion accuracy of internal wave wavelength and amplitude. [ABSTRACT FROM AUTHOR]

海洋内波是一种常见的致灾性中尺度海洋现象, 因其对海洋军事和海洋工程等存在巨大威胁而被广泛 关注。为了实现合成孔径雷达 (SAR) 图像海洋内波的准确检测, 解决传统检测算法易受斑噪干扰的问题, 本文 提出了一种基于超像素分割和全局显著性特征的 SAR 海洋内波检测算法。首先, 基于简单线性迭代聚类算法 (SLIC) 将 SAR 图像分割成特征均一的超像素; 然后, 利用超像素的梯度特征、灰度特征及空间特征构建内波显 著性特征向量, 计算其全局显著性并基于显著度提取内波超像素; 最后, 根据内波在傅里叶能量谱上的特征对 内波区域和非内波区域进行标记并生成标签图像, 用于对显著性检测结果进行校正。实验结果表明: 本文方法 对 5 景实验数据的内波条纹检测平均 F1 分数可达到 0.884、平均虚警率为 0.009, 证明了本文方法在不降低 SAR 图像空间分辨率的条件下可以有效抑制斑噪的影响, 实现高分辨率 SAR 海洋内波条纹的准确检测。 [ABSTRACT FROM AUTHOR]

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