A machine vision technology is used to detect the ground feature,based on block matching algorithm for AGV navigation. First,the overlap of each two frame images is identified. Second,the overlap of two images of different frames is found by using feature block matching algorithm. Last,through calculating the overlap image in the previous frame offset,the distance of the car moving is calculated. So far,the calculation of the car's track is completed. Experiment results show that prototype system of this me...