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基于区域模糊直方图的图像检索 总被引:2,自引:0,他引:2
将图像分割算法和模糊理论相结合,提出了基于区域模糊直方图的图像检索方法。用快速聚类算法对图像进行区域分块,以各区域的视觉特征为基础,建立图像模糊直方图并进行图像检索。在1000幅通用图像库上的实验表明,该方法可以得到比较满意的检索结果。 相似文献
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针对Mean-Shift算法仅利用颜色信息并以Bhattacharya系数为相似性度量导致算法准确率较低的问题,提出一种结合颜色和纹理信息并以直方图交集为相似性度量的跟踪算法。首先用局部二元模式算子提取纹理信息,再以对数比加权直方图取代传统直方图构建目标和候选目标模型,然后根据场景自适应地综合两类特征并通过Mean-Shift算法获得目标的初略位置,最后以直方图交集作为相似性度量并用Powell方法求其极值作为目标在当前帧中位置的估计。实验表明,该算法不仅能增强跟踪的准确性,而且对光照弱、目标与背景颜色近似等情况也有较好的鲁棒性。 相似文献
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一种基于小波的盲提取信息隐藏 总被引:1,自引:0,他引:1
提出了一种基于小波的盲提取信息隐藏算法。将载体进行小波分解,根据低频区域小波系数的重要比特位选择中频区域隐秘信息的嵌入位置。再将经过了预处理的隐秘信息映射到已确定的嵌入位置,最终通过小波反变换生成含有隐秘信息的伪对象。提取则是嵌入的反过程。试验表明此方法的隐藏效果较好,伪对象与原始载体的区别不易被人眼察觉。提取时不需要原始载体,具有一定的抗攻击性。 相似文献
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《船舶与海洋工程学报》2015,(4)
Underwater terrain-aided navigation is used to complement the traditional inertial navigation employed by autonomous underwater vehicles during lengthy missions. It can provide fixed estimations by matching real-time depth data with a digital terrain map. This study presents the concept of using image processing techniques in the underwater terrain matching process. A traditional gray-scale histogram of an image is enriched by incorporation with spatial information in pixels. Edge corner pixels are then defined and used to construct an edge corner histogram, which employs as a template to scan the digital terrain map and estimate the fixes of the vehicle by searching the correlation peak. Simulations are performed to investigate the robustness of the proposed method, particularly in relation to its sensitivity to background noise, the scale of real-time images, and the travel direction of the vehicle. At an image resolution of 1 m~2/pixel, the accuracy of localization is more than 10 meters. 相似文献
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一种基于PSO优化HWFCM的快速水下图像分割算法 总被引:3,自引:0,他引:3
The S/N of an underwater image is low and has a fuzzy edge.If using traditional methods to process it directly,the result is not satisfying.Though the traditional fuzzy C-means algorithm can sometimes divide the image into object and background,its time-consuming computation is often an obstacle.The mission of the vision system of an autonomous underwater vehicle (AUV) is to rapidly and exactly deal with the information about the object in a complex environment for the AUV to use the obtained result to execute the next task.So,by using the statistical characteristics of the gray image histogram,a fast and effective fuzzy C-means underwater image segmentation algorithm was presented.With the weighted histogram modifying the fuzzy membership,the above algorithm can not only cut down on a large amount of data processing and storage during the computation process compared with the traditional algorithm,so as to speed up the efficiency of the segmentation,but also improve the quality of underwater image segmentation.Finally,particle swarm optimization (PSO) described by the sine function was introduced to the algorithm mentioned above.It made up for the shortcomings that the FCM algorithm can not get the global optimal solution.Thus,on the one hand,it considers the global impact and achieves the local optimal solution,and on the other hand,further greatly increases the computing speed.Experimental results indicate that the novel algorithm can reach a better segmentation quality and the processing time of each image is reduced.They enhance efficiency and satisfy the requirements of a highly effective,real-time AUV. 相似文献
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分析各种周期信号在直方图上的规律,提出一种等间隔序列方法来分选复杂周期信号,利用等间隔序列比原序列含有更丰富的周期信息,减小了直方图方法在复杂信号环境中判别信号周期的级数和复杂性,从而提高了分选"周期性信号"的速度. 相似文献
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为研究炮兵指挥信息系统的作战使用效能,提出其效能评价指标体系。用层次分析法确定炮兵指挥信息系统作战效能评价指标权重,用改进的灰色评估理论建立炮兵指挥信息系统作战效能评估模型。以某炮兵指挥信息系统为例,用建立的模型进行量化评估,能充分利用决策者的判断信息,较为准确地反映实际情况。该模型可为部队训练和作战提供炮兵指挥信息系统的战斗效能数据,找出影响炮兵指挥信息系统作战能力的敏感因素,为发展新型装备提供依据。 相似文献
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舰艇装备信息安全管理综合评估方法 总被引:2,自引:2,他引:0
为合理、有效地进行舰艇装备信息安全管理评估,将层次分析法和灰色系统理论应用于舰艇装备信息安全管理领域,建立了基于多层次灰色关联分析法的舰艇装备信息安全管理综合评估模型。运用该模型对某舰艇进行装备信息安全管理的评估,结果与现实情况吻合较好,表明该方法具有一定的实用价值。 相似文献
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GML的提出为解决空间数据共享提供了一个契机。地理标记语言GML(Geography Markup language)是由OGC开发的一套基于XML的数据编码规则,主要用于地理信息的建模、存储和传输。本文首先简要介绍了GML3.0新增的内容、功能以及基本的数据模型。然后以构建旅游地理信息系统的空间模型为例,论述了GML空间数据建模的步骤。 相似文献
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提出在J2EE平台的应用服务器层构造符合航运业特点的海洋空间数据管理组件和数据服务组件,使基于J2EE规范建设的各类航运信息系统具备海洋空间信息处理能力,并实现海洋空间信息的共享以及与航运业务信息的集成和融合。 相似文献
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Rosaline Canessa Michael Butler Claudette Leblanc Christian Stewart Don Howes 《Coastal management》2013,41(1):105-142
Access to current, comprehensive, and reliable spatial information is necessary for informed decision making in integrated coastal and ocean management. This need is being met through development of a marine spatial information infrastructure that encompasses both technological and institutional responses. This article traces Canada's experience in developing a marine spatial information infrastructure over the last 30 years starting with the compilation of coastal atlases, through the development of geographic information systems, to remote data acquisition instruments and Web mapping portals. Because of the plethora of initiatives, it has been essential to be selected and limit the number and choice of examples. The institutional response has lagged behind that of technological innovation and hinges on understanding users’ needs and decision support drivers, sustainability of institutional and individual champions, and, above all, cooperation and collaboration among the broad community of practice. 相似文献