基于空间关系的图像检索方法研究
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摘要
随着计算机技术的广泛应用以及计算机技术与其它领域相关技术的充分结合,在新闻出版、医疗卫生、建筑设计等各个行业每天会有产生大量的数字图像。这些图像是一种宝贵的资源,如何从这一丰富的资源中获取感兴趣的信息是一个必须解决的问题。这就是图像检索问题。传统的基于字符的精确匹配检索方法并不能很好的应用于图像检索。因此,基于图像内容的检索方法研究成为研究的热点。本文将基于内容的图像检索方法作为研究对象,在以下方面进行了一些研究性的工作。
     1、将图像的空间关系用拓扑关系、投影关系、角度关系来表示,并给出了以上几种关系的定义。
     2、分别给出了拓扑关系、投影关系、角度关系距离的定义。
     3、分析了平移、放缩、旋转变换对基于对象空间关系图像检索方法的影响。
     4、通过求查询图像与数据库图像中共有对象数目的均值,将查询图像与数据库图像中共有对象数目加入到图像相似程度的度量尺度中。
     5、给出了两幅图像相似程度的度量公式及检索算法。
     6、将权重引入到相似程度度量公式当中,通过权重调整,可实现满足用户某方面需求的图像检索。
     7、开发了一个基于空间关系的图像检索系统,对图像的检索结果进行了分析,并与其它的检索方法进行了比较。
     基于内容的图像检索作为一个较新的研究领域,检索方法都不很成熟。如何使图像检索系统与人类判别图像相似程度的方法相一致,既合理选择表征图像的特征还需进一步研究。
As technologies of qomputer are widely applied, and technologies of computer combine with other technology of field relating, the fields of publishing industry, medical and related health professions and architectural and engineering design produce lots of digital image respectively every day. These images are precious resources. How to make fully use of these plenty of resources and how to easily get information we are interested in is a must solution. It is a question of image retrieval. The classical method of text-based retrieval is not suitable for image retrieval. Therefore, method of content-based image retrieval is widely studied. In this thesis, we present a method of image retrieval. We study from several aspects, which include:
    1. We represent image with topology relation, project relation
    and angle relation. And we present their definition respectively.
    2. We present distance definition between each spatial relation
    respectively.
    3. The effect of translation, scale and rotation is analyzed.
    4. The number of common object between query image and
    database image is considered.
    5. A formulation counting similar degree between two images is
    presented. A retrieval algorithm based on spatial relations among image objects is implemented.
    6. Weight is added to retrieval algorithm. All kinds of users are
    satisfied with query result through adjusting weight of spatial relation.
    7. A system of image retrieval based on spatial relation is
    implemented. A comparison with other method is presented
    too.
    Content-based image retrieval is a very new research field; therefore its retrieval method is not mature. How to make the image retrieval system works as accurately as mankind do (namely reasonably selecting the characteristics of the image) has much room to be studied further.
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