The results show that this method can deal with bimodality problem better,therefore can tackle effectively with the phenomenon when background and foreground are crossing each other.

In order to solve the multi-valued problem caused by the calculation process,several effective ways were proposed for the theoretical analysis.

In this paper the onedimonsional Stefantype model for the heat effect of highirradiance laser on biotissues and the inverse problem identification are adopted to obtain a relational expression for calculating the ablation depth in laserirradiated tissues, in which the complex nature of actual situationthe multidimensional problemis taken into account.