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面向图像的垂直搜索引擎关键技术研究
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摘要
随着网络带宽和软硬件性能的不断提高,多媒体文件的搜索需求日益高涨,图像检索作为文本检索到媒体检索跨域的第一步,逐渐成为是一个热门的研究领域。本文针对图像检索领域,从基于图像上下文的搜索和基于图像内容检索两方面进行研究。
     首先,研究了基于图像上下文垂直搜索引擎中的网络蜘蛛技术进行网络蜘蛛抓取和主题判定,使用DOM树和正则表达式对采集后的信息进行上下文提取,对提取内容切词建立索引,在满足互联网应用的同时,利用移动互联网技术,将内容转化至移动终端,并使用树状表示法建立规则知识库,实现结果的个性化推荐。
     然后,研究了基于内容的图像检索技术,将图像分层分割后,提取图像颜色、纹理和边缘特征进行多种特征融合,建立基于模糊支持向量机的多项分类模型,通过模型对图像不同图层的分类将多个关键字分配至该图像,使图像内容变成多关键字的描述
     最后,在图像检索的基础上,提取图像视觉内容特征中的纹理和颜色,抓住图像间的内容特点改进色彩传递方法。一方面,通过计算图像间的纹理相似度,搜索内容与灰度图像相近的色源图像,提高染色的成功率,另一方面提取颜色特征对图像进行更科学的像素采样,改进色彩传递算法本身,加强染色效果。
With the improving performance of internet bandwidth, software and hardware, the requirement of multimedia data searching is increasing also. Since image retrieval is the first step to cross from text retrieval to multimedia retieval, it has already been a hot research field. This paper focuses on image retrieval field and researches both context based Image Retrieval and content based image retrieval.
     Firstly, a web spider of context image retrieval from internet is studied to grab web page and defining the domain topic. DOM tree and Regular Expression is used to extract context, then the context is segmentted and indexed. At the same time, a mobile module is added in this search engine to propose an implementation method of mobile search engine, and a knowledge-based tree-like representation is introduced to present individually recommend.
     Secondly, content based image retrieval is researched. Image is divided into the multi-level regions. For each of them, the combined feature is extracted and inputted into the trained Fuzzy SVMs to classify, which has been proved better than conventional SVMs in the generalization ability. The values of classification in each category are calculated. Based on these values, the keywords are assigned.
     At last, visble features of image texture and color are extracted as indexes to catch the content characters of images based on the retrieval. They are used to transfer color from a source image to a target image, which builds a pixels relationship between the two images to render color. For one thing, the texture feature is used to compute the similarity between colorful image and grayscale image to search a similar source image which can help to increase the successful possibility of rendering. For another, the color feature is extracted to use to select sample pixels from source image to improve the rendering effect.
引文
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