adapted watershed algorithm的用法和样例：
- Finally, two-step marker results are fused and the image is segmented with a marker-based watershed algorithm.
- First, the object is extracted from left channel with an improved watershed algorithm and high-order statistics.
- In light of the fuzziness of craniocerebrum MRI image and the requirement in practical application,an improved watershed algorithm is proposed.
- Creative lake minimum was introduced to represent topographical information of a pixel,so as to reduce the number of RIDGE labels in order-invariant watershed algorithm.