Abstract: Few image details will be lost when noise is filtered in traditional image filtering algorithm. This article put forward an image filtering algorithm based on tangent image process model. I}his algorithm filters image by using tangent function and arctangent function according to 3*3 neighborhood pixel value of the pixel to be detected. It is simple, and easy to be implemented. Details of image edge and corner can be preserved and enhanced when noise is restrained effectively. I}he experiment shows that this algorithm is obviously better than other image filtering algorithm.

Key words: TIP model, Image filter, Detail signal, Noise