一种双向层间轮廓线线性插值方法

CT和MRI图像断层之间的距离通常大于断层内部间的像素的距离,为了实现断层图像层间的合理过度,需要对轮廓线进行线性插值。文中提出了一种双向的断层轮廓线线性插值方法。该方法首先对轮廓多边形进行逼近,然后从两个方向寻找最佳匹配点对,最后进行线性插值。该方法易于实现,执行速度快。实验结果表明这种方法不仅对形状相似的轮廓线插值效果好,对形状差异大的轮廓线也能得到令人满意的结果。

A Two-directional Linear Intermediate Contour Interpolation Algorithm

Typically,the spacing between the slices of CT and MRI is greater than the spacing between points on a slice. In order to make the transition of different slices more reasonable, intermediate contour interpolation is required. This paper gives a linear interpolation algorithm which constructs intermediate matching points from two directions. First, contour polygonal approximation is gained. Then, optimal matching points are found. Last, linear interpolation is conducted. Compared with the past methods, this method is easy to realize and has high executive speed. The experimental results show that this method is feasible to intermediate contour interpolation not only between similar contours but also dissimilar contours.