edge extracting的用法和样例：
例句
- Especially in the edge extraction, the speckle noise makes none of the conventional extraction algorithms get good result.
特别是对于边缘提取，斑点噪声使得传统的提取算法几乎都无法取得理想的效果。 - Combined with pattern matching, this new method could increase the precision of transferring the result of edge extraction from one slice to another.
结合匹配技术，提高边缘提取结果层间传递的精度。
