SIMULATING THE GRASSFIRE TRANSFORM USING AN ACTIVE CONTOUR MODEL
SIMULATING THE GRASSFIRE TRANSFORM USING AN ACTIVE CONTOUR MODEL
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DOI：
10.1109/34.107013
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发表时间：
1992-01-01
影响因子：
23.6
通讯作者：
LEVINE, MD
中科院分区：
文献类型：
--
作者：
LEYMARIE, F;LEVINE, MD
在本文中，我们提出了一种集成区域和边界特征的平面物体形状描述的新方法。 我们的方法是二维动态草火的实现，它依赖于弹性轮廓最小化能量函数的距离表面。 欧几里得距离变换与活动轮廓模型（例如蛇）相结合，用于此最小化过程。 通过提取曲率极值和常曲率弧将边界信息集成到模型中。 在草地上使用活动轮廓（表示为距离表面），结合边界的曲率特征，使我们能够提取形状的欧几里德骨架表示，同时绕过其他骨架化算法中发现的许多离散化问题。 我们基于距离表面上的对称点引入的局部变形的概念，提出了骨骼分支重要性的新概念。 我们称之为山脊支撑。 此外，我们还展示了如何根据对称轴的形成速度或对称轴切线的坡度幅度来评估山脊支撑。 我们提出了一个新概念（可变形骨架），它对于跟踪可变形形状很有用。 我们将其称为动态骨架。
In this paper, we present a new method for shape description of planar objects that integrates both region and boundary features. Our method is an implementation of a 2-D dynamic grassfire that relies on a distance surface on which elastic contours minimize an energy function. A Euclidean distance transform combined with an active contour model, such as the snake, is used for this minimization process. Boundary information is integrated into the model by the extraction of curvature extrema and arcs of constant curvature. The use of an active contour on a field of grass, represented as a distance surface, combined with the curvature features of the boundary permits us to extract a Euclidean skeleton representation of the shape while bypassing many of the discretization problems found in other skeletonization algorithms. We propose a new concept for skeletal branch significance based on the notion of the local deformation introduced by symmetry points on the distance surface. We call this the ridge support. Furthermore, we show how the ridge support can be evaluated in terms of the velocity of formation of a symmetric axis or in terms of the slope amplitude of a tangent to the symmetric axis. We propose a new concept (the deformable skeleton), which is useful for tracking deformable shapes. We refer to this as the dynamic skeleton.