A fractal enhancement algorithm based on frequency characteristics of human eyes is proposed.First of all,combining the frequency characteristic of human eye with fractal dimension,the images are enhanced.Then,the spatial frequency of human eye perception is calculated in frequency domain,and the sensitive image region of human eye is obtained by frequency domain filtering,and the images are enhanced by using the theoretical value of fractal dimension.This method uses a model with a size of 5×5 and Euclidean distance.In addition,a new enhancement method based on the gray scale resolution characteristics of human eye is proposed.In the range of different gray levels,human eye’s resolution to grayscale is different.Using this characteristic,the sensitive details of the eye is more prominent.Compared with the traditional algorithm,the proposed enhancement algorithm is more suitable for human eye.