Pulse Coupled Neural Network (PCNN), which has the biology background, is a new generation artificial neural network .It is largely different from traditional artificial neural network. It shows the character of pulse emission, double-channel-multiplying modulation, can vary the threshold dynamically, has the refractory period and capturing period when the pulses coming from external neural cells and the external stimulation exist, shows the character of space-time accumulation, simulates well the f...