一种B-样条主动轮廓线模型  

A B-SPLINE ACTIVE CONTOUR MODEL

作　　者：张爱东[1] 张田文[1] 

机构地区：[1]哈尔滨工业大学

出　　处：《哈尔滨师范大学自然科学学报》1999年第4期62-66,共5页Natural Science Journal of Harbin Normal University

基　　金：国家自然科学基金资助!(批准号 :697750 77)

摘　　要：主动轮廓线模型——“蛇”是一种将目标的轮廓模型与图像特征相匹配的方法 ,它利用物体的多边形表示 ,把目标公式化为一个适当的能量函数E,然后将 E最小化得到所期望的轮廓线 ,从而能识别和跟踪序列图像中的可变形物体 .本文对主动轮廓线模型进行了简单回顾与分析 ,利用参数 B-样条曲线建立了新的模型 ,称为“B-蛇”.利用 B-样条的局域控制、简洁表示及参数连续性等特点 ,提高了系统的精确性及收敛速度 ,具备表示角点的能力 ,它在连续域里完成最小化形成了更稳定的特性及良好的抗噪性 .Active contour models,or snakes ,are a well known method for matching an object's contour model to features in an image.The approach,which usese polygonal object representation,is possible to firstly formulate an appropriate energy function E for the object. E is then minimised to obtain the desired contour.It is therefore capable of identifying and tracking deformable objects in image sequences.In this paper,we present a brief overview and analysis of deformable contour models.A new active contour model—B- snakes is proposed,which allows for the parametric B-spline representation.B-spline bases provide local control of shape,compact representation,and parametric continuity.Our model is superior both in accuracy and convergence speed.It can have breakpoints and include corners.The minimization is performed in the continuous domain forcing a more stable behavior and improves noise suppression.

关 键 词：主动轮廓线 B-样条 边缘轮廓 计算机视觉 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]