曲线描述的一种方法:夹角链码

Included Angle Chain:A Method for Curve Representation

提出了一种有效的曲线编码和描述方法——夹角链码.夹角链码的思想框架是:首先将曲线用一串有方向的等长度的线段来表述,根据相邻线段之间的夹角差形成一串角度序列,即夹角链码来描述这条曲线.描述曲线的直线段的数目由面积法则来决定,并且待处理的曲线将被分割成相等数目的线段.该方法最大的一个优点是曲线的描述具有平移、拉伸和旋转的不变性.该方法的一个实际应用在于,将某一个地区的合成孔径雷达(synthetic aperture Radar,简称SAR)图像与地图相匹配.

A novel approach, Included Angle Chain, is presented for curve representation and encoding. In this framework, a curve is modeled by a number of linked equi-length line segments and a sequence of codes using the included angles between a pair of neighboring line segments is used for representing the curve. The number of the segments is determined by an area criterion, and the curves to be matched are represented by an included angle chain of the same length. The representation is invariant to rotation, scaling, and translation. A practical use of the proposed approach is to register a SAR (synthetic aperture Radar) image of certain region with maps.