共查询到19条相似文献,搜索用时 722 毫秒
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以子块直方图彩色图像检索算法为基础, 分析了进一步利用图像空间相似信息的颜色匹配对检索算法的性能。在子块直方图的构成、直方图距离值的归类等方面提出了行之有效的改进方法;给出了子块大小、相似度阈值等参数选择的优化原则,使查准率、查全率等检索性能指标得到了较大的提高,得出了几个有用的结论并形成了实验系统。 相似文献
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综合颜色和形状特征的图像检索 总被引:1,自引:0,他引:1
提出了一种组合颜色和形状特征的图像检索方法,将彩色图像转变成灰度图象,计算查询图像和数据库图像的直方图距离,通过图像分割提取图像的形状特征,利用两特征的加权距离计算图像之间的相似度,而后进行图像检索。通过实验表明该组合方法优于单纯特征的图像检索。 相似文献
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针对国内外还没有可供研究人员和公众使用的藏毯类非物质文化遗产数字化资源平台这一状况,分析了在藏毯图像中运用基于内容的图像检索系统技术的可行性。通过对藏毯图像的颜色特征分析,提出并实现了在基于JAVA的框架中计算颜色直方图的方法,采用Correlation相似距离衡量直方图的相似度,根据相似度大小匹配待查询的图像,最终返回与待查询藏毯图像相同或相似的图像结果集,藏毯图像检索的查全率与查准率明显提高。 相似文献
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以图像颜色聚合向量为基础,并结合图像显著特征,提出了一种基于加权颜色聚合向量的图像检索方法.首先,提取图像的显著性图,并进行归一化处理,得到加权矩阵;然后,对图像进行颜色聚合向量提取,并根据加权矩阵进行加权处理;最后通过计算两幅图像之间的加权颜色聚合向量相似度,进行图像检索.该方法既系统兼顾了图像的颜色分布特征和高层视觉特征,又具有较高的计算速度;实验结果证明,该算法的检索精度明显高于传统的基于颜色统计特征的检索精度. 相似文献
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当前图像检索算法通常针对整体图像提取特征以完成检索任务.然而,在很多情况下用户只会关注图像的一部分,即他们的兴趣目标.此时,从整体图像提取的特征一部分是有效的,另一部分则是无效的且会对检索过程带来消极影响.为此,本文提出基于兴趣目标的图像检索方案,并借助于现有的显著性检测、图像分割、特征提取等技术实现一款有效的图像检索算法.首先采用HS (Hierarchical Saliency,分层显著性)检测算法分析用户的兴趣目标并应用SC (Saliency-based Image Cut,基于显著性的图像分割)算法将其分割,然后针对兴趣目标提取HSV (Hue、Saturation、Value,色调、饱和度、明度)颜色特征、SIFT (Scale Invariant Feature Transform,尺度不变特征变换)局部特征和CNN (Convolutional Neural Network,卷积神经网络)语义特征,最后计算其与数据库图像的相似度并根据相似度排序返回检索结果.仿真实验结果表明,本文算法在解决"这是什么东西"这类图像检索任务时明显优于现有的图像检索算法. 相似文献
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特征选择技术对于图像检索系统有效实现相关目标的识别具有重要的意义.依据视觉生理学和视觉心理学关于不同颜色间存在敏感度差异的理论,并利用Stevens法则和HSV颜色空间的六棱锥模型,提出了一种构造颜色敏感度函数的算法.新算法以主观信息量多少为评价标准,通过系数补偿,实现了显著程度不同颜色间特征幅值的平衡,从而提高了检索特征与感知特征的一致性.实验结果证明了新算法能够稳定、有效地提升图像检索系统的性能. 相似文献
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In Content-based Image Retrieval (CBIR), the user provides the query image in which only a selective portion of the image carries the foremost vital information known as the object region of the image. However, the human visual system also focuses on a particular salient region of an image to instinctively understand its semantic meaning. Therefore, the human visual attention technique can be well imposed in the CBIR scheme. Inspired by these facts, we initially utilized the signature saliency map-based approach to decompose the image into its respective main object region (ObR) and non-object region (NObR). ObR possesses most of the vital image information, so block-level normalized singular value decomposition (SVD) has been used to extract salient features of the ObR. In most natural images, NObR plays a significant role in understanding the actual semantic meaning of the image. Accordingly, multi-directional texture features have been extracted from NObR using Gabor filter on different wavelengths. Since the importance of ObR and NObR features are not equal, a new homogeneity-based similarity matching approach has been devised to enhance retrieval accuracy. Finally, we have demonstrated retrieval performances using both the combined and distinct ObR and NObR features on seven standard coral, texture, object, and heterogeneous datasets. The experimental outcomes show that the proposed CBIR system has a promising retrieval efficiency and outperforms various existing systems substantially. 相似文献
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The complexity of multimedia contents is significantly increasing in the current digital world. This yields an exigent demand for developing highly effective retrieval systems to satisfy human needs. Recently, extensive research efforts have been presented and conducted in the field of content-based image retrieval (CBIR). The majority of these efforts have been concentrated on reducing the semantic gap that exists between low-level image features represented by digital machines and the profusion of high-level human perception used to perceive images. Based on the growing research in the recent years, this paper provides a comprehensive review on the state-of-the-art in the field of CBIR. Additionally, this study presents a detailed overview of the CBIR framework and improvements achieved; including image preprocessing, feature extraction and indexing, system learning, benchmarking datasets, similarity matching, relevance feedback, performance evaluation, and visualization. Finally, promising research trends, challenges, and our insights are provided to inspire further research efforts. 相似文献
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基于德劳内三角剖分的彩色图像加权直方图表示及检索技术 总被引:2,自引:1,他引:1
经典的颜色直方图方法存在诸多缺陷,例如它不能表示图像中颜色的空间分布信息。为了进一步的提高图像检索能力,在分析图像特征的基础上,文章给出了一种基于角度图的直方图加权的图像表示方法。这种方法不仅保持了图像直方图简单方便的特点,同时又有效地将颜色的空间分布信息集成到直方图中。实验结果表明,对比经典直方图表示这种彩色图像的表示方法能获得更好的检索效果。 相似文献
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《Journal of Visual Communication and Image Representation》2014,25(6):1308-1323
Content-based image retrieval (CBIR) has been an active research topic in the last decade. As one of the promising approaches, salient point based image retrieval has attracted many researchers. However, the related work is usually very time consuming, and some salient points always may not represent the most interesting subset of points for image indexing. Based on fast and performant salient point detector, and the salient point expansion, a novel content-based image retrieval using local visual attention feature is proposed in this paper. Firstly, the salient image points are extracted by using the fast and performant SURF (Speeded-Up Robust Features) detector. Then, the visually significant image points around salient points can be obtained according to the salient point expansion. Finally, the local visual attention feature of visually significant image points, including the weighted color histogram and spatial distribution entropy, are extracted, and the similarity between color images is computed by using the local visual attention feature. Experimental results, including comparisons with the state-of-the-art retrieval systems, demonstrate the effectiveness of our proposal. 相似文献