封闭曲线 meaning in English
closed curve
Examples
- Circulation around closed circuit
沿封闭曲线的环流 - Finally , the convexity - concavity of the closed curve is detected . in the end , choi ' s pair - wise offset of polygon algorithm is improv ed based on the proposed curve intersection algorithm
文章最后完善了choi多边形等距偏移算法，并把本文提出的封闭曲线求交方法应用其中，用于自交点的确定。 - For the closed - curves consist of arcs and line segments , we present a fast approach to find intersections of closed - curve by extending park ' s polygonal chains intersection algorithm
对于圆弧和直线段组成的封闭曲线求交，本文通过拓展park多边形链求交方法提出了一个圆弧和直线段组成的封闭曲线求交方法。 - In the algorithm , the convexity - concavity of vertexes and arcs must be identified , and a fast approach for identifying the convexity - concavity of line - arc closed curve is proposed . firstly , the orientation of a closed - curve is determined by constructing a new convex polygon . secondly , by using the orientation of the closed curve the convexity - concavity of vertices and arcs are identified
在算法实现过程中，由于需要对圆弧和直线段组成的封闭曲线的顶点、圆弧的凸凹性进行判定，本文提出了一个圆弧和直线段组成的封闭曲线凸凹性快速判定方法，该方法首先通过构造一中介凸多边形求出封闭曲线的方向，然后根据封闭曲线方向确定顶点及圆弧的凸凹性，进而确定封闭曲线的凸凹性。 - Firstly , fourier descriptor used to describe the object ' s shape is introduced to the extraction of feature of apple ' s shape . the boundary of apple is an obturated curve , distance between boundary point and centroid r ( k ) " is used as a function to express the 2 - d boundary in spatial domain . the fourier transform coefficients of the discrete sequences f ( h ) are spectrum values in frequency domain , and they compose feature parameters of shape
首次将图像分析理论中对形状的傅立叶描述方法引入到对苹果形状的特征提取中，果实边界是一条封闭曲线，用边界点到形心之间的距离长度r ( l )作为空域中对二维曲线的表达函数，离散的函数值序列r ( k ) ~ l的离散傅立叶变换系数f ( h )就是频域中得到的频谱值，可作为形状的特征参数。