It is described that how to combine rough set with PCNN(Pulse Coupled Neural Network)to enhance the contrast of a noisy image to make the image clear so that the next image processing is easy.Meanwhile,the rough set and PCNN image enhancement algorithm is brought forward.The results of computer simulations show that noisy gray images can be enhanced efficiently by using this algorithm and image noise is reduced and image contrast is enhanced so that the image becomes clearer.In addition,the enhancement effe...