基于Gabor特征增强的冷泉羽状流分割方法

Segmentation of cold seep plume based on Gabor features enhancement

  • 摘要: 准确识别气泡羽状流是发现海底冷泉溢出口的重要途径。光学图像中的冷泉羽状流具有明度高、纹理不固定、方向一致、尺度不一、边缘不清晰的特征。而冷泉溢出口附近分布着大量沉积物及深海黑暗生物群,这些复杂无序的背景环境会给羽状流分割带来挑战。为深入分析羽状流及其背景环境特征,本文提出一种基于Gabor特征增强的羽状流分割方法。该方法主要将原始RGB图像转换为HSV图像,以明度V通道图像对研究对象依次进行巴特沃斯高通滤波、直方图增强、闭运算操作,获得羽状流特征增强的图像;设计Gabor滤波器提取增强图像的纹理特征,融合纹理特征和空间特征构建出气泡羽状流的特征向量;采用主成分分析对特征向量进行降维,通过K-均值聚类分析最终实现对羽状流的分割。实验表明,对比Gabor、最佳阈值分割算法,本文方法分割羽状流的精确率分别提高了11.03%、16.84%,F1值分别提高了5.83%、9.13%。通过该方法突出羽状流特征、弱化海底环境影响,可实现不同尺度、方向、强度的羽状流分割,有效支撑海底冷泉探测及研究任务。

     

    Abstract: Accurate identifying of bubble plume is an important way to discover the outlets of submarine cold seep. The submarine cold seep plume in image features high brightness, unfixed texture, consistent direction, different scale, and unclear edge with the background environment. However, there are a large number of sediments and deep-sea dark biota that depend on gas hydrate near the submarine cold seep overflow outlet, and these complex and disordered background environments bring challenges to plume segmentation. Based on the in-depth analysis of the plume flow and background environmental characteristics, we proposed a method of the segmentation of cold seep plume based on the Gabor features enhancement. In this method, original RGB images are converted into HSV images, and the V-channel images are used to perform the Butterworth high-pass filtering, histogram enhancement, and closed-operation operations on the research object in turn to obtain the plume feature enhancement images. A Gabor filter was designed to extract the texture features of the enhanced images, and the feature vectors of the bubble plume flow are constructed by fusing the texture features and spatial features. Principal component analysis was used to reduce the dimensionality of the eigenvector, and the segmentation of the plume flow was finally realized by K-means cluster analysis. Experiments showed that compared with the Gabor and the optimal threshold segmentation algorithm, the accuracy of the proposed method was increased by 11.03% and 16.84%, and the F1 value was increased by 5.83% and 9.13%, respectively. Therefore, by highlighting the characteristics of plume flow and weakening the environmental impact of the seabed, the plume segmentation of different scales, directions, and intensities can be realized to effectively support the exploration and research tasks of submarine cold seeps.

     

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