A novel adaptive algorithm for image segmentation based on the dual-level pulse coupled neural networks(PCNN) is proposed.For the dual-level PCNN,the first level is based on the simplified PCNN model to obtain the region seeds;the next level adopts the region growing strategy,and recruits the pixels which have similar gray level to the seeds to achieve the growth of the regions.The sensitive parameters of the PCNN can be tuned adaptively,which can overcome the limitation of the parameter setting...