An adaptive key frame selection(AKFS) algorithm is proposed to deal with the problem of periodic key frame selection(PKFS) algorithm without considering the interframe correlation of video sequence in the distributed video coding(DVC) system.The unmatched points in the adjacent frames are used as an approximation of the interframe correlation by detecting and matching interesting points of image,and the frame,whose accumulative or average number of unmatched points is above the threshold,can be judged as th...