Research On Motion Estimation Technology Of Video Compression System

With the rapid evolution of digital information technology, the demand to the multimedia communication service increases steadily. Video compression technology is the key of implementing the multimedia communication service, and the kernel part of the video compression technology is motion estimation. This paper gives the correlative research on the motion estimation fast algorithm, puts forward several motion estimation fast algorithms based the block matching. Firstly, the paper expatiates the essence principle of the motion estimation based block matching, introduces Full Search method and several typical motion estimation fast algorithms, and analyzes each characteristic, then to sum up the key technology for increasing the motion estimation search efficiency; Secondly, it stress introduces three motion estimation fast improved algorithms: the improved algorithm based Full Search method, it imports successive elimination algorithm,subsample and termination condition to increase search speed for enhancing the real time of Full Search. A new hierarchical pyramid search method, which is from the old hierarchical pyramid search method, can improve the search precision. The motion scope judgement search method based prognosticating the search beginning point, it utilizes the time relativity and the space relativity of block to prognosticate the search beginning point, and adopts the different search pattern according to the block motion scope, the search efficiency is close to the Three Step Search, which proves the feasibility of researching the new efficient motion estimation algorithm according to the characteristic of block motion to use the different search methods; In the end, this paper evaluates the advantage and disadvantage of the different fast algorithms through the data get from the experiment, it will have some reference value to bringing the new and effective motion estimation fast algorithm in the later research.