Superpixel local information measurement-based polarized SAR ship target detection method

Abstract

The invention discloses a superpixel local information measurement-based polarized SAR ship target detection method, and mainly aims at solving the problem that the target detection rate lower complicated scenes is low. The method comprises the following steps of: 1, carrying out superpixel segmentation on an original image so as to obtain superpixel segmentation results under different scales; 2,for the segmented results, calculating three superpixel level-based difference measurements by utilizing a sliding window model; 3, converting the superpixel level-based difference measurements intopixel level-based difference measurements; 4, mapping pixel-level difference measurement vectors into different measurement values by utilizing kernel fisher discrimination, so as to a difference measurement value of each pixel point; and 5, classifying the difference measurement values of the pixel points by utilizing a linear SVM classifier, determining a category of each pixel and carrying outautomatic target detection. The method is capable of enhancing the target detection performance under complicated scenes an realizing the automatic detection process, and can be used for subsequent ship target discrimination, recognition and classification.

Description

technical field [0001] The invention belongs to the technical field of radar target detection, and mainly relates to a polarization SAR ship target detection method, which can be used for subsequent ship target identification, identification and classification. Background technique [0002] Synthetic aperture radar SAR uses microwave remote sensing technology, is not affected by climate and day and night, has all-weather and all-weather working capabilities, and has the characteristics of multi-band, multi-polarization, variable viewing angle and penetrability. At present, SAR has been widely used in military reconnaissance, geological census, topographic mapping and mapping, disaster forecasting, marine applications, and scientific research, and has broad research and application prospects. Polarimetric SAR has rapidly become one of the important directions of SAR development because of its obvious advantage of being able to obtain complete polarization information. Ship t...

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Problems solved by technology

The second method is to select the detection threshold empirically based on the sensitivity analysis of some parameters, which is inconvenient for different polarization systems

The third method is to use the clustering method to determine the detection threshold. However, the clustering process of this method must be carried out in a local area. When no ships exist, the detection threshold determined by this method may lead to subsequent detection of many false alarm

[0005] The above-mentioned traditional methods mainly have the following two disadvantages: first, they are easily affected by complex sea conditions and changes in the signal-to-clutter ratio, resulting in a decrease in the contrast between ships and sea clutter; second, it is difficult to obtain accurate detection thresholds, giving extreme It brings great inconvenience to the target detection system

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