说明：  提出一种新的广泛应用于数字图象分析和计算机视觉的主动轮廓(Snake)模型，引 入作用方向可以自适应变化的外加强制力，使控制点能够不依赖于初始轮廓而快速地收敛 到目标的真实轮廓；初始轮廓自动确定；控制点的数目可以自适应地改变；能够在背号比较 复杂的图象中实现对目标轮廓的提取 用该模型对空中目标的红外图象进行的实验结果表 明其具有很好的鲁棒性和实用性．
(A new widely used in digital image analysis and computer vision in the active contour (Snake) model, the introduction of the role of adaptive changes in the direction of the applied force can force the control points can not depend on the initial contour and quickly converge to the real target contour initial contour automatically determines number of control points can be adaptive to change that number in the back to achieve more complex picture of the target contour extraction of air targets by using the model of experiments on the infrared images The results show that it is robust and practical.)