This paper presents a method for extracting geometrical features of the joint probability density function(PDF)of two-dimensional systems based on its contour lines,with particular interests given to the number and po...This paper presents a method for extracting geometrical features of the joint probability density function(PDF)of two-dimensional systems based on its contour lines,with particular interests given to the number and position of peaks and craters.In order to detect those two types of structures,a series of horizontal planes are applied to truncate the joint PDF with contour lines generated.Starting with the analysis of contour lines in a single plane,shape characteristics of the peak and the crater can be reflected on the contour lines in the aspects of gradient direction and inclusion relationship.Aided by the properties of PDF,the information about gradient direction and inclusion relationship of contour lines can be obtained simultaneously if the contour tree is built.According to the contour tree,the contour lines can be classified as two groups.Then the corresponding relation between contour lines in different planes is discussed.Based on the corresponding relation,clustering analysis about contour lines belonging to the same group but having different heights is performed.Two sets of contour lines are finally obtained as the simplest expression of geometrical characteristics of a joint PDF.They can be used to obtain the number and position of each peak and crater.Three oscillators of different types are chosen to test this method,which shows that this method can pave the way for numerical calculation about the stochastic P-bifurcation of multi-dimensional systems.展开更多
This paper deals withthe automatic connection of contourlines extracted from a scanned browngeographical map.For the variety oftopographical elements contained on amap,the factors causing the interrup-tion of contour ...This paper deals withthe automatic connection of contourlines extracted from a scanned browngeographical map.For the variety oftopographical elements contained on amap,the factors causing the interrup-tion of contour line are also multiform,which make the connection task verydifficult.On the basis of separatingthose elements always making the con-tours break and regarding them as ref-erent layers,a layering-based methodis presented.The purpose is to takeinto account property information(likeinclination and configuration)of con-tour lines when they come across otherdifferent symbols,such as gully,cliff,dry land and elevation annotation etc.In this paper,the authors propose thatit should be far more effective and di-rect to adopt different algorithmic op-erators to different factors than usingsingle one operator to all.展开更多
This paper introduces the rough machining of territorial machining and contour line machining based on the CAXA manufacturing engineer 2004, and gives an analysis of the combined machining of territorial machining and...This paper introduces the rough machining of territorial machining and contour line machining based on the CAXA manufacturing engineer 2004, and gives an analysis of the combined machining of territorial machining and contour line machining. Finally, it proves the superiority of the combined machining by the example of high speed machining of an aluminium alloy lamina part.展开更多
This paper analyzes the advantages and disadvantages of two techni-cal lines for automatic group generalization of contour lines.The author suggeststhat it is possible to get faster and better generalization results i...This paper analyzes the advantages and disadvantages of two techni-cal lines for automatic group generalization of contour lines.The author suggeststhat it is possible to get faster and better generalization results if we simulate theintelligence of human experts in program designing,retrieve geomorphologicalstructural information using the input data of 2-D contour lines and derive andoutput the generalied 2-D results directly.展开更多
A contour tree is a good graphical tool for representing the spatial relations of contour lines and has many applications in map generalization, map annotation, terrain analysis, etc. A new method for generating conto...A contour tree is a good graphical tool for representing the spatial relations of contour lines and has many applications in map generalization, map annotation, terrain analysis, etc. A new method for generating contour trees by introducing a Voronoi based interior adjacency concept is proposed in this paper. The immediate interior adjacency set is employed to identify all of the children contours of each contour without contour elevations. It has advantages over existing methods such as the geometric method and the region growing based method.展开更多
基金supported by the National Program on Key Basic Research Project(Grant No.2014CB046805)National Natural Science Foundation of China(Grant No.11372211).
文摘This paper presents a method for extracting geometrical features of the joint probability density function(PDF)of two-dimensional systems based on its contour lines,with particular interests given to the number and position of peaks and craters.In order to detect those two types of structures,a series of horizontal planes are applied to truncate the joint PDF with contour lines generated.Starting with the analysis of contour lines in a single plane,shape characteristics of the peak and the crater can be reflected on the contour lines in the aspects of gradient direction and inclusion relationship.Aided by the properties of PDF,the information about gradient direction and inclusion relationship of contour lines can be obtained simultaneously if the contour tree is built.According to the contour tree,the contour lines can be classified as two groups.Then the corresponding relation between contour lines in different planes is discussed.Based on the corresponding relation,clustering analysis about contour lines belonging to the same group but having different heights is performed.Two sets of contour lines are finally obtained as the simplest expression of geometrical characteristics of a joint PDF.They can be used to obtain the number and position of each peak and crater.Three oscillators of different types are chosen to test this method,which shows that this method can pave the way for numerical calculation about the stochastic P-bifurcation of multi-dimensional systems.
基金the Scientific Research Foundation of Wuhan University(No.40071071).
文摘This paper deals withthe automatic connection of contourlines extracted from a scanned browngeographical map.For the variety oftopographical elements contained on amap,the factors causing the interrup-tion of contour line are also multiform,which make the connection task verydifficult.On the basis of separatingthose elements always making the con-tours break and regarding them as ref-erent layers,a layering-based methodis presented.The purpose is to takeinto account property information(likeinclination and configuration)of con-tour lines when they come across otherdifferent symbols,such as gully,cliff,dry land and elevation annotation etc.In this paper,the authors propose thatit should be far more effective and di-rect to adopt different algorithmic op-erators to different factors than usingsingle one operator to all.
基金supported by the Natural Science Foundation of Xi'an University of Architecture and Technology under Grant No.JC0919
文摘This paper introduces the rough machining of territorial machining and contour line machining based on the CAXA manufacturing engineer 2004, and gives an analysis of the combined machining of territorial machining and contour line machining. Finally, it proves the superiority of the combined machining by the example of high speed machining of an aluminium alloy lamina part.
文摘This paper analyzes the advantages and disadvantages of two techni-cal lines for automatic group generalization of contour lines.The author suggeststhat it is possible to get faster and better generalization results if we simulate theintelligence of human experts in program designing,retrieve geomorphologicalstructural information using the input data of 2-D contour lines and derive andoutput the generalied 2-D results directly.
文摘A contour tree is a good graphical tool for representing the spatial relations of contour lines and has many applications in map generalization, map annotation, terrain analysis, etc. A new method for generating contour trees by introducing a Voronoi based interior adjacency concept is proposed in this paper. The immediate interior adjacency set is employed to identify all of the children contours of each contour without contour elevations. It has advantages over existing methods such as the geometric method and the region growing based method.
