Search

The lack of true color and the presence of background clutter reduce the accuracy rate of the saliency analysis for oil tank extraction in the synthetic aperture radar (SAR) images. This letter proposes a specially designed unsupervised method to extract oil tanks using the joint-spatial saliency analysis (JSSA) for multiple SAR images. First, the intrasaliency analysis is established on a saliency driven iterative clustering. This considers the spatial intensity and texture feature within a single image and suppresses most backgrounds. Second, the cospatial residual and the local grayscale statistics are considered independently in the intersaliency analysis. The common salient parts among the input series are extracted and used to overcome the problem of the lack of true color. Third, to make the fusion of the two kinds of saliency maps, the low-rank matrix is introduced. The weights of different maps are calculated and the saliency cues are integrated efficiently. Finally, after the statistics of the highlight points within the candidates, the location of the oil tanks is refined. The experiments show the superiority of the proposed method in both the pixel level and the geometric segmentation. The result of the JSSA model appears to improve the accuracy with fewer missing objects compared with the competing algorithms.

A novel saliency-driven oil tank detection method based on multidimensional feature vector clustering (MFVC) is proposed in this letter for synthetic aperture radar (SAR) images. There are three major contributions: 1) a specially designed MFVC method, which is suitable for SAR images without true colors, is employed to detect oil tanks roughly by saliency analysis. Five important complementary features, including intensity, texture, structure, and 2-D coordinates, form a 5-D vector, and then an unsupervised strategy is employed for clustering the 5-D feature vectors to acquire the saliency map; 2) For accurate location, the shape limit coefficient is added to the original active contour model to extract contours of top surfaces; and 3) according to the relations of top, bottom, and the brightest arch, bottoms of oil tanks are computed precisely. Experiments are conducted in two aspects: evaluation for saliency analysis, and for bottom location. Results show that the MFVC method outperforms competing methods in maintaining complete oil tanks and accurate boundaries, and removing the background clutter as much as possible.

Synthetic Aperture Radar (SAR) imaging system plays an important role in earth observation research. This leads to the significance of target detection in SAR image. In this paper, we propose a novel saliency-driven oil tank detection method (SDD) for SAR images. First, we use the enhanced directional smoothing (EDS) to remove speckle noise from SAR images; in the step of saliency analysis, the integer wavelet transforms (IWT) and the DoG filter are used to obtain orientation and intensity features, respectively. Then, the orientation feature map and the intensity feature map resulting from these two kinds of features are utilized to compute the final saliency map; after segmenting the saliency map, the obtained connected domain guide the Active Contour Model (ACM) to acquire accurate contours of tops of oil tanks, and the bottoms of the oil tanks can be detected by the strong scattering points around the tops. Experimental results show that the proposed model outperforms the classical/state-of-the-art models in maintaining complete targets and accurate boundaries.

The advance in synthetic aperture radar (SAR) technology reduces the difficulty of data acquisition, along with greatly increased computational complexity. This paper cares about this and aims to accomplish oil tank detection in SAR images from the perspective of computer vision. The whole model includes three main steps. The first is a saliency-driven clustering to accomplish the single image saliency analysis according to the intensity specificity and texture distribution. The second step introduces a common visual saliency analysis based on the co-spatial residual and local gradation statistic to extract the common visual salient parts within the input series. The final step considers the distribution of adjacent highlight points obtained from the saliency analysis to accomplish the location of tanks. Three competing methods are established in the experimental part. The evaluation in pixel level and geometric segmentation accuracy both verify the superiority of the proposed model in target detection and interferences exclusion.

As the significant position of oil tanks in oil storage, oil tank detection plays an important role in auto target detection for SAR images. This paper presents a linear clustering saliency analysis based detection model. Firstly, a linear iterative clustering of which the feature vector consists of three texture features and 2-D coordinates is used to over segment the input image. At the same time, multi intensity saliency maps constrain the shape of the superpixel using an adaptive balance weight. Secondly, feature vectors generated from the cluster centers are scattered as far as possible via Principal Component Analysis and sent to the MeanShift model to coarsely locate the candidate area. Finally, strong scattered points on the roof of tanks are utilized to locate the top of the targets. The whole method is evaluated in two aspects: the evaluation of saliency analysis and the accuracy rate of the top location. Experiment shows the efficiency and superiority of our algorithm with fewer interferences and more accurate location of oil tanks.

The great increase in the resolution of remote sensing images comes with the problem of high computational complexity. Besides, the irregular circular shape of the tanks and the difficulty to establish the dataset make the detection task a big challenge. This paper proposes a co-feature and shape prior based saliency analysis model to extract the candidates. Two kinds of saliency maps are considered including the co-feature spatial residual map which is extracted as the common parts of different feature maps and the shape saliency map which provides the complementary information with the shape prior knowledge of circular targets. Besides, the curvature driven active contour model is used to insure the precise of the extracted contour. The quantitative evaluation of the experiments is conducted considering the detection precision and the geometric error. Results show that the proposed method is superior both in the pixel level performance and the geometric shape.