in Figure 6, we show a typical example that has been widely in used in related works [8]. A comparison between the ROF model and our model is made on the noise removal of this image. Both models are effective in noise removal. However, in contrast to the residual image f ° u by using the ROF model, our residual image includes almost no signal information. As in Figure 5, this example also shows that our model is capable of corner and image grey intensity contrast preserving.