H.263 Protocols And Some Algorithm Improvements

The thesis focuses on motion picture data compression techniques used in video communication, proposes modified implementations of two kernel algorithms in this field. For the feet that general DCT algorithms do no match the precision clauses of IEEE 1180-1990, the thesis presents a precision-improved DCT algorithm implementation, which measures up to the relative IEEE criterions appended as Appendix A of H.263 Recommendation, at the same time, promises not slowing down the operation enormously and increasing the complexity minutely. Then thesis also presents a basic algorithm for other motion estimation algorithms, which provides a platform on which the others can be operated to speed up the algorithm further. At first, the thesis introduces the main specification of H.263 Recommendation, and in the following parts, illustrates the principle of the precision-improved DCT algorithm, gives the compare results of the algorithm and the others. In the consequent chapter, the thesis presents the basic motion estimation algorithm, then analyses the experiment results. At last, it forecasts the prospects of H.263 recommendation research in the future.