Linear feature shifting method for self-adaptation setting of shape parameters of Snakes model

A technology of shape parameters and linear elements, which is applied in the field of linear element displacement for adaptively setting the shape parameters of Snakes model, can solve the problem of lack of parameter setting methods, and achieve the advantages of spatial relationship and position accuracy, and enhanced controllability. Effect

Inactive Publication Date: 2014-07-16
WUHAN UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Burghardt and Meier [5] 、Bader [10] and Wu Xiaofang [11] Scholars have discussed the setting of shape parameters and put forward the basic principles of parameter setting, but there is still a lack of effective parameter setting methods.

Method used

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  • Linear feature shifting method for self-adaptation setting of shape parameters of Snakes model
  • Linear feature shifting method for self-adaptation setting of shape parameters of Snakes model
  • Linear feature shifting method for self-adaptation setting of shape parameters of Snakes model

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Embodiment Construction

[0047] The existing theories involved in the present invention, the idea of ​​the present invention and specific implementation methods will be described in detail below.

[0048] 1. The displacement theory of linear elements based on the Snakes model

[0049] The linear element displacement method of the present invention adopts the linear element displacement method based on the Snakes model, and the energy description adopts the most basic displacement amount to represent, and the geometric shape change of the linear element before and after the displacement is used to describe the internal energy, and the adjacent line The spatial conflict of shape elements describes the external energy.

[0050] Based on the principle of minimum energy, the optimal shape and position of linear targets after displacement are calculated. The mathematical expression of the shift amount is: s→d(s)=(x(s)-x 0 (s),y(s)-y 0 (s)) T , 0≤s≤l, where l represents the length of the linear target; s...

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Abstract

The invention discloses a linear feature shifting method for self-adaptation setting of shape parameters of a Snakes model. The linear feature shifting method comprises the steps that shape parameters of a linear target are obtained according to the relation between the positioning priority and the shape parameters of the linear target; bends on the linear target are identified, and shape parameters of the bents are obtained on the basis of the relation between the curvatures and the shape parameters of the bends; the shape parameters of the bend where a finite element unit is located are used for establishing a finite element rigidity matrix, and the linear target in a map is shifted through a linear feature shifting method based on the Snakes model. The global optimization characteristic of the shifting method based on the Snakes model is reserved, the semantic relation between different map features and internal graphic characteristics of a map target are taken into consideration to a certain extent, and the map feature spatial relation and positional accuracy can be kept conveniently.

Description

technical field [0001] The invention belongs to the technical field of automatic synthesis of maps, in particular to a linear element shift method for adaptively setting shape parameters of a Snakes model. Background technique [0002] In the process of map synthesis, due to the reduction of the scale, the map space is also reduced, and some elements have to be exaggerated with symbols larger than the actual size, which may lead to proximity conflicts, visual conflicts, and spatial relationship conflicts between adjacent objects on the map. In order to maintain the clarity of the map, these conflicts must be handled by operations such as selection, merging, exaggeration, and shifting, among which shifting is the most commonly used operation to resolve such conflicts. [0003] The linear elements (such as roads, rivers, etc.) on the map can be regarded as the skeleton of the map, with a wide distribution and complex structure. The related problem of automatic map synthesis i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00
Inventor 郭庆胜刘远刚孙雅庚马潇雅王琳黄鹤声林青
Owner WUHAN UNIV
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