A fast and robustApproach for the detection of text on road signs based on improved SCW (sliding concentric windows) is proposed in this paper. The algorithm mainly contains three stages. We first convert the input image to a binary image using improved SCW then we obtain the blob information using CCA (connected componentanalysis)

and at last we achieve the final text location on road signs by a number of judging criterions. Experimental results demonstrate the great robustness and efficiency of our method.