Abstract: To resolve the problem of image registration in image terminal-guiding system,a rapid image registration approach based on Harris algorithm using projective transformation model is proposed.First,Harris algorithm is reinforced in rotational invariance,then corners of every frame in camera system are extracted using the improved Harris algorithm,and coarse matching is executed on corners using normalized cross correlation algorithm.Second,Random Samples Consensus algorithm is iterative used to filter the coarse matched corners,and removing the wrong matching points.The accurate matching points are put in projective transformation model to calculate the stable projective transformation.Finally,images registration is carry out by means of projective transformation matrix which can reflect the translation,rotation and scale change.Experimental results demonstrate that the proposed approach is invariant to translation,rotation,scale,viewpoints changes and robust to illumination changes and blur,and can be used to implement high precision image registration fast and efficiently under projective transformation model.