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    • 20. 发明申请
    • IMAGE PROCESSING APPARATUS AND METHODS
    • 图像处理设备和方法
    • WO2004079654A3
    • 2004-10-28
    • PCT/GB2004000988
    • 2004-03-08
    • WEBER MARTINMARTIN PHILIP JOHN
    • WEBER MARTIN
    • G06T5/00
    • G06T7/149G06T7/12G06T2207/20161
    • This invention is generally concerned with image processing systems, and more particularly with improved image processing systems employing a novel numerical scheme for so-called 'level-set' methods to describe moving interfaces. Embodiments of the invention have applications in two, three and higher dimensional modelling, and in particular in fitting a contour or surface to an image or an object. A numerical representation of interfaces (in particular curves and surfaces) is presented which optionally includes so called material properties. Material properties can be used to represent additional non-geometric data on the interface, such as reflectance. A method of processing digital image data representing an image of an object to determine data representing a boundary for said object, the method comprising: inputting said image data; initialising a level set function representation of an interface for approximating said boundary; determining a motion of said interface subject to a combined cost function comprising a first cost comprising a signed distance constraint on said interface level set function representation and a second cost comprising a measure of said interface responsive to a density or metric of said image; modifying said level set function representation of said interface in accordance with said determined motion; repeating said determining and modifying such that said interface converges on said boundary; and determining boundary data representing said boundary from said converged level set function interface representation.
    • 本发明通常涉及图像处理系统,并且更具体地涉及改进的图像处理系统,其采用用于描述移动界面的所谓“水平集”方法的新型数字方案。 本发明的实施例具有二维,三维和更高维建模中的应用,并且特别适用于将轮廓或表面拟合到图像或物体。 介绍界面(特别是曲线和表面)的数字表示,其可选地包括所谓的材料属性。 材料属性可用于表示界面上的其他非几何数据,如反射率。 一种处理表示物体图像的数字图像数据以确定代表所述物体的边界的数据的方法,所述方法包括:输入所述图像数据; 初始化用于逼近所述边界的界面的水平集函数表示; 确定所述接口的运动受制于包括第一成本和第二成本的组合成本函数,所述第一成本包括关于所述界面水平集函数表示的带符号距离约束,所述第二成本包括响应于所述图像的密度或度量的所述接口的度量; 根据所述确定的运动修改所述界面的所述水平集函数表示; 重复所述确定和修改,使得所述界面收敛于所述边界; 以及从所述收敛水平集函数接口表示确定表示所述边界的边界数据。