】本文首先简单回顾了基于抛物型偏微分方程的图像恢复模型。在此基础上，提出了一个通过

可变权重联合各向同性扩散和金变分模型的图像恢复模型，该权重参数依赖于图像曲面的几何特征。

最后，通过数值实验论证了算法的有效-Abstract：In this paper，we study the dynamic behavior of a class of predator prey system with stage-structure and

Beddington-DeAngelis functional response．Under certain assumptions，sut~cient an d necessary conditions which

guaran tee the predator and the prey species to be permanent are obtained．In addition，the suficient conditions are

derived for the existence of positive period ic solutions to the syste