By using a camera which is shooting the ground vertically to capture two continuous images,the horizontal speed and the vertical speed are calculated.TMS320DM642 is taken as the core,and then the vision library(VLIB) of Texas Instruments(TI) is utilized to realize complex algorithm.By using the Harris corner detection of VLIB,the feature points are extracted.And then,by utilizing Lucas-Kanade optical flow with image pyramid,tracking the feature points that have large displacement is realized.The data of hor...