Neural Network is a non-linear dynamics kinetics system

which can do a lot of complex jobs

especially in information science. Inputting image information into computers is an inevitable and troublesome job in many practical systems such as CAD and GIS

etc. An automatic method is needed badly. After analysing fundamental theories of Hopfield model and multi-layered network

a new method to solve the problem realized by a BP algorithm is proposed. During experimental simulations

this algorithm really showed fine performance.