With the changes of the knee angles, the moving track of upper and lower edge point of the knee cap is similarly a parabola;
髌骨上、下缘点随膝角变化的运动轨迹类似于抛物线形状；
In addition, gradient direction constraint of edge point was introduced. Matching algorithm based on aforementioned constraints was proposed.
此外还介绍了边缘点的梯度方向约束，给出了基于以上约束条件的边缘线匹配算法。
It analyses and studies the operating method in image processing area, including image division, image filter, picking up edge point, drawing up line and getting the distance of parallel lines.
分析并研究了可用于指针图像处理的图像分割、图像滤波、边缘点提取、直线拟合、平行直线求距等运算方法。
It analyses and studies the operating method in image processing area, including image division, image filter, picking up edge point, drawing up line and getting the distance of parallel lines.
分析并研究了可用于指针图像处理的图像分割、图像滤波、边缘点提取、直线拟合、平行直线求距等运算方法。
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