检索结果-南通市图书馆

Blob Objects Analysis Using Watershed transformation

在线全文

学校读者我要写书评

暂无评论

引用

The Journal of China Universities of Posts and Telecommunications 2000年第4期7卷 25-30页

作者： GUIYi ZHOUNan BeijingUniversityofPostsandTelecommunications Beijing100876P.R.China DepartmentofMechanicalEngineeri

This paper presents a novel method for overlapping or touching blob object ( particles ) segmentation. It is based on the watershed transformation, one of the most powerful image analysis tools provided by mathematical morphology. In this method, we first build the distance function of the blob image, and then extract the regional minima as markers, and finally the watershed transformation is performed. The applications of this algorithm illustrated using the examples of red blood cell segmentation and broken medicine pill detection.

关键词： mathematical morphology distance transformation watershed transformation image segmentation

Projection registration of X-ray image and CT image

在线全文

学校读者我要写书评

暂无评论

引用

Journal of Southeast University(English Edition) 2003年第1期19卷 26-30页

作者：张惠罗立民舒华忠李松毅 Pascal Haigron 东南大学生物科学与医学工程系南京2113096 法国雷恩第一大学信号与图像处理实验室法国雷恩35042

A methodology for alignment of an X-ray image and a CT image, based on the Chamfer 3-4 distance transform and simulated annealing optimization algorithm is presented. Firstly, an initial transformation matrix is constructed. For the convenience of computing, geometric models of the X-ray device to reconstruct the calibration matrix are used. Then, by defining the distance between the 3-D protective and the 2-D object image, we optimize this distance matching problem, using the simulated annealing algorithm. This method is also integrated into medical intra-operation, dealing with the data set acquired from 3-D image workstation and active navigation.

关键词： image registration calibration matrix image segmentation distance transformation simulated annealing

Numerical Evaluation of CPV Boundary Integrals with Symmetrical Quadrature Schemes

在线全文

学校读者我要写书评

暂无评论

引用

Journal of Shanghai University(English Edition) 2003年第1期7卷 28-34页

作者：马杭徐凯宇 Department of Mechanics College of Sciences Shanghai University

Stemming from the definition of the Cauchy principal values (CPV) integrals, a newly developed symmetrical quadrature scheme was proposed in the paper for the accurate numerical evaluation of the singular boundary integrals in the sense of CPV encountered in the boundary element method. In the case of inner element singularities, the CPV integrals could be evaluated in a straightforward way by dividing the element into the symmetrical part and the remainder(s). And in the case of end singularities, the CPV integrals could be evaluated simply by taking a tangential distance transformation of the integrand after cutting out a symmetrical tiny zone around the singular point. In both cases, the operations are no longer necessary before the numerical implementation, which involves the dull routine work to separate out singularities from the integral kernels. Numerical examples were presented for both the two and the three dimensional boundary integrals in elasticity. Comparing the numerical results with those by other approaches demonstrates the feasibility and the effectiveness of the proposed scheme.

关键词： boundary element method(BEM) singular boundary integral symmetrical integration distance transformation numerical evaluation.