Adaptive key frame selection algorithm based on the interframe correlation in distributed video coding
Lan Zhang · Journal of Optoelectronics·laser · 2010
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 the key frame.An improved scheme of frame interpolation is proposed in order to generate the side information for flexible group-of-picture(GOP) lengths.The compression efficiency is further improved after the correlated frames with zero motion intensity are merged into one frame for encoding and decoding.Experimental results show that 0.9-2.0 dB enhancement in the rate-distortion performance is achieved by applying the proposed algorithm in the DVC system,and the transmission code rates are reduced in different video sequence environments.