基于纹理特征的图像检索技术研究
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摘要
近年来,国内外在图像检索和管理技术的研究中出现了一个新热点—基于内容的图像检索CBIR(Content Based Image Retrieval)。纹理是图像的重要信息和特征,在病理诊断、文物复原等多个领域有着广泛的应用。本文主要针对基于纹理特征的图像检索技术展开研究。
     本文主要工作包括纹理特征提取的算法研究和相似性度量方法的研究。在纹理特征提取算法中,研究了灰度共生矩阵法,并通过实验验证了其有效性。然后研究了小波变换法,通过树形小波分解得到图像的能量值作为纹理特征。最后研究了Tamura纹理分析法,实验验证了此方法符合人眼的视觉感受。在相似性度量方法中,研究了欧氏距离、街区距离、组合距离等,并探讨了相关反馈算法。最后给出了本文选用的距离函数。
     最后,通过实验验证了灰度共生矩阵法采用的四个特征参数能够有效的反映图像在方向、间隔、变化幅度及快慢的综合信息,既保证了纹理图像特征的准确性,又提高了提取速度。相似度量中的加权街区距离由于考虑了各特征对于图像的重要程度,提高了图像检索的精度。
In recent years, a new point appeared in the research of the technology of image retrieval and management. Texture is an important feature in image, used in pathological diagnose, heritage recovery, and so on. This paper mainly researched the technology of image retrieval based on texture feature.
     Recently, a few image retrieval systems have been realized. But most of them stay at experiment stage, and are used only in special field. It does not receive a wide range of promotion. In this paper, the texture image retrieval algorithms were researched in-depth. It provided valuable support of the theory and frame of reference for content-based image retrieval technology.
     The main work of this paper included the researches of texture feature extraction algorithms and similarity measurement methods. In the texture feature extraction algorithms, the gray level co-occurrence matrix method was studied, and through experiments, its validity was verified. And then the wavelet transform was studied, through the wavelet decomposition tree to receive the energy value as the image texture feature. Finally, the Tamura texture was analyzed. The experiments verified that this method suited with the human eye's visual experience. In the similarity measurement methods, it studyed Euclidean distance, block distance and the combination distance, and so on, and discussed the relevance feedback algorithm. Finally, this paper gave the distance function.
     Finally, the four parameters of gray co-occurrence matrix could effectively reflect the image in the direction, interval, changes in the rate and speed information. It not only ensured the accuracy of the feature of the image texture, but also increased the speed of extraction. In the similarity measurement methods, because the weighted block distance considered all features' importance to the image, it improved the accuracy of the image retrieval.
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