With the rapid development of Intelligent Vehicle System (IVS) method, its research involves different kind of fields, such as computer measurement, control method, computer vision method, sensor data fusion method and vehicle project. In order to control the vehicle automatically only based on the images, we use some special technique of image processing method to extract the feature of the images, the process is complicated, it involves three steps. The paper first introduces image processing method, the technology and its application, then the paper focus on collision avoidance system to explain why image processing is important to it. What is more, the paper mainly explain algorithm of image processing, include image enhancement, detection algorithm of image edge, fast inverse transform algorithm based on characteristic curve. Finally, the paper gives an example how these image processing applies in road scene and its effectiveness
