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    • 77. 发明申请
    • IMAGE PROCESSING APPARATUS AND METHODS
    • 图像处理装置和方法
    • WO2004079654A2
    • 2004-09-16
    • PCT/GB2004/000988
    • 2004-03-08
    • MARTIN, Philip, JohnWEBER, Martin
    • 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,更具体地涉及采用用于所谓的“级别集”方法来描述移动界面的新型数值方案的改进的图像处理系统。 本发明的实施例在二维,三维和更高维度建模中具有应用,并且特别地将轮廓或表面拟合到图像或对象。 提出了界面(特别是曲线和曲面)的数值表示,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。 一种处理表示对象的图像的数字图像数据的方法,用于确定表示所述对象的边界的数据,所述方法包括:输入所述图像数据; 初始化用于近似所述边界的接口的级集合函数表示; 根据组合成本函数确定所述接口的运动,所述组合成本函数包括第一成本,所述第一成本包括对所述接口级集合函数表示的有符号距离约束,以及响应于所述图像的密度或度量的所述接口的度量的第二成本; 根据所述确定的运动修改所述接口的所述电平集函数表示; 重复所述确定和修改使得所述接口收敛在所述边界上; 以及从所述会聚级集合函数接口表示确定表示所述边界的边界数据。