针对二维边缘算子无法提取固体发动机CT图像轴向边缘的问题,提出基于引力模型的三维边缘提取方法。该方法首先利用线性插值法将序列CT图像构造成各向同性的三维数据场,其次将生成数据场与引力模型边缘算子卷积得到合成三维力数据场,最后对力数据场设置不同阈值进行三维边缘提取。通过三维边缘不同提取结果的比较得出,阈值为最大合力的2.5%~3.5%时可以准确提取固体发动机的三维边缘。

To concentrate on solving the problem that 2D edge operator can't extract axial edge of solid motor' CT image, 3D edge extraction based on gravitation model was put forward. Firstly isotropic data field was constructed from CT image series using linear interpolation; secondly, 3D force data field was got by convolution of isotropic field and finally gravitation model edge operator. 3D edges were extracted by different thresholds. It comes to the conclusion by comparison of different edges, and that 3D edge of solid motor can be extracted accurately when the best threshold interval is 2.5% -3.5% of maximum force.