In this paper the methods of determining iterative initial value about iterative proce- dure for discrete ordinate time-dependent neutron transport equation are studied.

The least square mathematical models of cylinder,cone,and torus were defined,and the optimization algorithm and the method of selecting iterative initial values were presented.

DTIE could be employed to provide the iterative initial value implementing M-step in some EM algorithms.

Aiming at problems in current study of sonar image enhancement,a new enhancement method based iterative threshold was presented,the criterion function and frequency response were used to evaluate and compare current image enhancement arithmeti.

A modification to Linearly Decreasing Weight strategy in standard Particle Swarm Optimization is taken by introducing descending index and iterative threshold.

The identification card scanned image is seriously affected by laser restraining false shadow grid, several binarization methods of document image are studied according to this characteristic, an image binarization method is proposed , which is called iterative threshold methodbased on the neighborhood feature of the pixels .