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Alternative TitleSynthetic aperture radar image target segmentation method based on boundary and texture information
谌华; 郭伟; 闫敬文
Source Publication中国图象图形学报
Keyword合成孔径雷达图像 目标分割 Maxflow算法 中值滤波 邻域生长算法
Abstract目的针对传统Grab Cut算法需要人工交互操作,无法实现合成孔径雷达(SAR)图像的自动分割,且方式单一(仅利用边界或纹理信息中的一种)的问题,提出一种综合利用边界和纹理信息的改进Grab Cut算法,实现对SAR图像目标的自动分割。方法首先将其他格式的彩色或灰度SAR图像转化为24 bit的位图,采用图形理论对整幅SAR图像建模,根据最大流算法找到描述图的能量函数最小的割集,从而分割出目标区域;然后采用中值滤波抑制相干噪声;最后通过邻域生长算法滤除图像斑点和小目标的干扰,从而达到目标边界的连接,实现自动对SAR图像中的目标进行分割。结果在64位Window 7环境下采用MATLAB R2014处理平台,对楼房、车库、大树、汽车群等4幅分辨率不同的SAR图像进行目标分割实验,特征目标被自动分割出来,耗时分别为1.69 s、 1.58 s、1.84 s和3.09 s,相比Mean-shift和Otsu算法,平均计算效率分别提升150 %和3%,并且图像中的背景杂波、目标阴影和干扰小目标均被有效去除。结论综合利用边界和纹理信息能够有效抑制相干噪声,去除图像斑点和小目标的干扰,从而达到目标边界的连接,实现对SAR图像目标的自动分割。实验结果表明,本文算法可以满足工程化应用要求,自适应性强,分割精度高,且具有较好的鲁棒性。
Other AbstractObjective Synthetic aperture radar (SAR) systems are widely applied in many areas,such as civil and military fields,because they can operate day and night under various weather conditions. As a key and basic section of target recognition and interpretation for SAR images,SAR image segmentation has received much attention in recent years. However, SAR images suffer from strong speckle noise due to the influence of coherent illumination,which makes target segmentation in images difficult. Considering the importance of SAR image segmentation,this study proposes to segment the targets of a SAR image automatically. Many algorithms can solve SAR image target segmentation,and one of these is the GrabCut algorithm. The GrabCut algorithm,which is based on graph theory,achieves optimal segmentation and transforms the image segmentation problem into a problem of computing the maximum flow in the flow network. After this transformation, the problem can be solved with the min-cut or max-flow method. Nevertheless,the GrabCut algorithm has crucial deficiencies; for example,it not only requires artificial interaction but also merely utilizes one of the following: information, texture,or boundary information in the images. To improve such deficiencies,this study uses two kinds of information, namely,texture and boundary,for utilization in SAR images and for achieving automatic target segmentation. Method The proposed algorithm involves several steps. First,the proposed algorithm transforms a colored or gray SAR image into a 24- bit bitmap that contains substantial SAR image information. Second,with the aid of the 24-bit bitmap,a SAR image model is built according to graph theory. The model is a Gaussian mixed model that assigns each pixel in SAR images into three types of chroma spaces. Under the model framework,the energy function of the minimized description diagram is generated. Third,to segment the target region in the SAR image,the max-flow method is applied to determine the smallest cut set of the energy function in the description diagram. Coherent noise has a serious impact on image segmentation; thus,the proposed algorithm utilizes the median filter method to reduce noise in the target region and achieve precise SAR image target segmentation. Lastly,one of main problems in segmentation is that the interference of SAR image spots and small objects leads to incorrect targets during target segmentation. The neighborhood growth method,which removes specks in the SAR image target region and filters out small targets,is applied to tackle this problem and connect the target boundary. Through these steps,SAR image target segmentation can be performed automatically. Result Several state-of-the-start image segmentation algorithms,including mean-shift and Otsu segmentation algorithms,are compared with the proposed algorithm to validate its superiority. All experiments are performed in the processing platform of MATLAB R2014 in a 64-bit Windows 7 environment. In the first experiment,four different SAR images involving buildings,garages,trees,and cars are tested for image target segmentation. Results show that the proposed algorithm can segment many useful characteristics in the targets and can effectively remove background clutter,target shadows,and small interfering targets in the tested SAR images. This capability demonstrates that the proposed algorithm performs well in SAR image segmentation. A second experiment is conducted to illustrate the performance of the proposed algorithm. Here,mean-shift and Otsu segmentation algorithms and the proposed algorithm are simultaneously tested using four SAR images.
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Document Type期刊论文
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GB/T 7714
谌华,郭伟,闫敬文. 综合边界和纹理信息的合成孔径雷达图像目标分割[J]. 中国图象图形学报,2019,24(6):882-889.
APA 谌华,郭伟,&闫敬文.(2019).综合边界和纹理信息的合成孔径雷达图像目标分割.中国图象图形学报,24(6),882-889.
MLA 谌华,et al."综合边界和纹理信息的合成孔径雷达图像目标分割".中国图象图形学报 24.6(2019):882-889.
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