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基于形状匹配的商标图像检索技术研究
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摘要
随着市场经济的发展,商标数量逐年递增。传统的基于分类、文本标注的商标图像检索方法存在着很大的难题,包括手工分类/注解工作量大、描述主观性、描述不全面性等问题。基于内容的图像检索技术可以克服这些弊端,它在商标检索领域得到了非常广泛的应用。
     基于内容的商标图像检索方法利用图像自身包含的特征属性,如颜色、形状、纹理及空间位置关系等建立图像的索引,然后利用这些特征进行检索。作为人工图像的商标图像,其形状特征较其它特征更为显著,人们往往更多地通过形状来识别不同的商标。本文主要针对基于形状匹配的商标图像检索关键问题展开研究,包括:商标图像分割技术、形状边界描述方法、形状区域描述方法、形状特征融合及匹配技术、基于多特征融合的子图像检索方法等,文中提出了一些解决问题的方法,具有一定的理论意义和实际应用价值。本文的主要工作和贡献如下:
     1.深入研究了商标图像分割技术,提出了一个基于分水岭和高斯重叠率衡量多层融合的商标图像分割新方法WG-OLR;该方法可高效对商标图像进行自动分割;
     2.研究基于边界的商标形状特征匹配方法,提出了一个基于角点检测及其Delaunay图的形状边界特征匹配方法DT-MATCH;该方法可快速的对非复杂的商标形状进行描述,并具有较好的检索效率;
     3.研究基于区域的商标形状特征匹配方法,针对一类基于分区块统计的形状描述方法进行比较研究,确定了基于分区块统计描述思想下最适合的形状描述方法CAM;
     4.分析了基于边界和基于区域特征形状描述方法的优缺点,并将这两种特征进行融合,针对商标的形状,提出了一种融合边界和区域特征的全图商标图像检索方法BR-MATCH;该方法不仅具有较好的匹配效果,同时具有较快的检索速度;
     5.利用建立的商标图像分割技术和形状描述方法,同时融合颜色、空间位置关系等其它特征,提出了一种基于多特征融合的子图商标图像检索方法SBR-MATCH;子图检索方法较全图检索方法精度有了进一步的提高。
With the development of market economy, the quantity of trademark increases progressively year by year. The tradition trademark image retrieval based on classified or text labeling has many problems, including the very load of manual illustration work, subjectivity, inaccuracy, etc. Content-based image retrieval (CBIR) technology can overcome these problems, so it obtained the very widespread application in the trademark retrieval domain.
     The methods of CBIR retrieve the images using the characteristics of themselves, such as color, shape, texture and the space position relations. Trademark image as an artificial image, compared with other features, shape is the most remarkable, so we always use the shape feature to distinguish various trademarks This dissertation focuses on the key technologies of the shape matching based trademark image retrieval, including: trademark image segmentation technology, boundary-based shape description method, region-based shape description method, shape feature fusion and matching, sub-image multi-characteristic fusion retrieval, etc. The main contributions of this dissertation can be summarized as follows:
     1. Several key technologies of trademark image segmentation are deeply investigated and analyzed. A new multi-layer fusion image segmentation method is proposed, named WG-OLR. This method can carry on the automatic image segmentation with high efficiency.
     2. Research on the boundary-based shape description method of the trademark image. A new shape boundary matching method based on comer detection and Delaunay Triangulation Net, named DT-MATCH, is proposed. This method can carry on fast feature description to the non-complex shape and has the good retrieval efficiency.
     3. Research on the region-based shape description method of the trademark image. We mainly aim at one kind of sub-area statistics shape description method to carry on quite studies and find out the most suitable shape description method based on the sub-area statistics description thought.
     4. After analyzing the advantages and disadvantages of the boundary-based and region-based shape description method, in view of the trademark shape, we propose a new total-graph trademark image retrieval method that fuses the boundary and the region features, named BR-MATCH. This method not only has the good match effect, simultaneously has the quick retrieval speed.
     5. Using the established image segmentation technology, synthesizing to the research on shape description method, simultaneously fusing the color, the space position relations and other characteristics, we propose a new sub-graph trademark image retrieval method based on the multi-characteristic fusion, named SBR-MATCH. Compares with the total-graph retrieval method, the precision of sub-graph retrieval method has the further enhancement.
引文
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