【作者】 王海霞；

【导师】 覃团发；

【作者基本信息】 广西大学 ， 计算机应用技术， 2004， 硕士

【摘要】 随着多媒体时代的到来，越来越多的图像被广泛的使用，基于内容的图像检索(CBIR)技术成为近年来的一个研究热点。另一方面，由于信息的复杂多样，对其内容的描述缺乏统一标准，这就导致现有CBIR系统的通用性得不到保证，MPEG-7正是为规范多媒体内容描述而启动的国际标准，它将描述与信息内容相联系，使快速、有效的查询和访问各种多媒体成为可能。 本文的主要研究目标是基于MPEG-7的图像检索，取得了一些有意义的研究成果。主要内容包括： ·详细研究了MPEG-7中颜色描述符的提取方法，对其中的颜色布局和颜色结构描述符进行了检索实验和性能分析。 ·提出了一种主颜色提取方法，与同样基于向量量化的主颜色提取方法相比取得了更好的检索效果，同时对其采用的分块加权方案改进效果明显。 ·提出了基于结构量化直方图的图像检索方法，指出颜色结构直方图和全局直方图是结构量化直方图取极值量化步长的特例，通过检索实验对三者的性能进行了分析，实验结果显示量化步长取0.5时结构量化直方图的检索效果最好。 J’一西大学硕一}:学位沦文:基于MPEG一7的图像检索技术 ·利用主颜色和颜色布局开发了一个实际的图像检索系统，同时满足了全局和局部两种不同的相似需要，检索结果表明综合两种特征的检索与使用单一特征相比效果更好。更多还原

【Abstract】 Along with the arrival of the multimedia age, more and more images were used widely. Content-based image retrieval technology has been a research hot spot in the recent years. On the other hand, due to the complexity of the information, the lack of standard for the description of image content induces low interoperability among CBIR systems. To meet this challenge, MPEG-7 was started as a solution to the normative description of audiovisual content. MPEG-7 relates the description with its content, and enables the effective and efficient query and access to multimedia content.In this paper, the main research objective is the study of image retrieval based on MPEG-7. Some significative conclusions are drawed from this study. The major contents include:The extraction of color descriptors is reported in detailed. The color layout and color structure descriptor are used in retrieval test and the performance is discussed.An extraction of dominant color is presented and it obtains better retrieval effectiveness compared with the extraction, which also baseon vector quantization. A method which adds the weight to blocks was applied to dominant color and the improved effect is obvious.A method for image retrieval based on structuring quantized histogram is presented. The color structure histogram and color histogram are the specific cases of structuring quantized histogram, which is endowed an extreme quantized step. The performances of the three type of histogram are discussed through the retrieval test and results show that the performance of structuring quantized histogram is the best.An actual CBIR system was developed based on dominant color and color layout, meeting global and local similarity needs. Retrieval results obtained from combined features are superior to that obtained from single feature.更多还原