Abstract: Image enhancement is an algorithm which is performed on image to make it seemed “better”.Since human being is the final receiver of the image，the key point of the image assessment is that it should be in conformity with the characteristics of human visual system.In this paper，a new method of low contrast image enhancement is presented based on PCNN and LR models in conjunction with characteristics of human visual consciousness.Results of analysis and experiments show that this method strengthens the details of edges and ameliorates visual effect obviously.