材料图像的解析性及边缘提取的复分析方法
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摘要
本文聚焦图像低层特征尺度不变性和边缘提取准确性等几个图像分析核心问题,旨在建立分析材料显微组织结构的复分析理论和方法.首先,基于复分析的Cauchy型积分理论,定义材料图像函数的局部解析性,将图像特征提取问题转换为图像函数的解析性的奇异性检测问题.其中,以围道积分路径的几何形态和属性体现空间尺度属性,以各阶Cauchy型积分值构造的特征向量定义图像局部解析性.其次,讨论不同围道积分路径几何形态下图像函数解析性的数值计算方法,设计Cauchy型积分快速计算算法.最后,对几种陶瓷和铸铁材料,研究材料显微组织结构图像的解析性和边缘提取算法效率,基于数据实验验证本文提出的理论设想,并与其它算法进行效力比对.为统一各种能够表达空间尺度属性的材料显微组织结构图像的低层特征提取方法,本文的研究是一种尝试.
This paper focuses on the scale invariant low-level features of material images and the accuracy of edge detection algorithms of images in order to establish complex analysis theory and an analytic method for analyzing and expressing material micro-structures.Firstly,based on the Cauchy-type integral theory,the local analyticities of the material image functions are defined.And the image feature extraction problem is converted into the problem of singularity detection of the analytic function of the image.The geometric shapes and properties of the integral paths relate the spatial scales,and the local analyticities of the images are defined by the characteristic vectors of the Cauchy-type integral values of finite orders.Secondly,a numerical method of the analytic image functions is discussed,and a fast computational algorithm of the Cauchy-type integrals is designed.Finally,several ceramic and ferrite material images are considered to validate the efficiency of the material micro-structure image edge detection algorithm proposed in this paper.And based on experimental data,the proposed theoretical assumptions are validated,and the edge detection algorithm is compared with other algorithms as well.The research of this paper is an attempt to unify the low level feature extraction methods of the material images with different spatial scale properties.
引文
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