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基于JPEG2000压缩域的Web图像检索
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摘要
互联网上存在大量图像信息,如何有效的对图像资源进行组织并检索到用户所需要的图像,便成为人们研究的课题。由于基于压缩域的图像检索能够同时达到检索快速和检索效果良好这两个目的,成为近年来图像工作者的研究热点。压缩技术的多样性,导致基于压缩域的检索技术种类繁多。小波理论近年来得到了广泛关注和较快的发展,它能够对研究对象同时在频率域和时间域上进行分析,能够进行多分辨率分析。经小波变换后产生的小波系数可以很好的体现图像信息的局部特性。这些优点促进了人们对基于离散小波变换域的图像搜索技术的研究。新一代压缩标准JPEG2000采用小波变换技术,由于该标准所具有的各种优点,使得这种图像压缩标准会逐渐在Internet、医学、地质和数码产品等各个领域得到应用和普及。于是更显示了研究基于小波域图像检索技术的重要性,但到目前为止专门针对JPEG2000压缩域的图像检索算法很少,国内关于这方面的文章也很少,有限的几个算法检索效率也不高。所以为了适应对网络上海量图像快速搜索的需要以及JPEG2000新标准的推出,本文提出了两种改进了的基于JPEG2000压缩域的图像搜索算法。
     本文首先对小波理论进行了一定的阐述,并详细说明了使用此技术对图像进行处理的天然优势,包括多分辨率分析和嵌入式编码。随后对
There are abundant of image information on Internet. How to manage the image resources efficiently and search the images that users need is becoming the people's researching topics. Because the image indexing based on compressed domain can attain the two objects of quick retrieval speed and good retrieval result at the same time, it has already been the research hotspot in recent years. The diversity of compression technologies leads to the diversity of searching technologies. Wavelet theory has been received broad attention and quick development. It could analyse the researching object on frequency domain and time domain concurrently and has multi-resolution analyse ability. The coefficients after wavelet transform could embody the part features of image information perfectly. These advantages promote people to study the image searching based on discrete wavelet transform domain. The new compression standard JPEG2000 adopts wavelet transform technology. Because of the priorities of the convention, it could be applied broadly on Internet, medicine, geology and data products. So it's very important to research the technologies about
引文
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