【摘要】 对全局运动估计进行了研究 ,并提出了它的改进算法。在有局部运动的情况下 ,改进算法的计算速度和准确性都有明显提高。研究了全局运动估计在视频编码中的应用。在视频压缩中它是spirte编码的关键技术 ,这种技术较之传统编码方法有较好的编码性能。利用MPEG 4的软件测试平台进行了MPEG 4校验模型中已有算法的实验比较 ,结果表明 ,改进的全局运动估计的计算速度明显提高 ,视频编码的性能得到了改善更多还原

【Abstract】 Global motion estimation and its application in video coding are studied and its improved method is proposed. The proposed method is faster and it is more effective when local motion exists compared with the method in the verification model of MPEG 4. Global motion estimation is applied in virtual reality and video coding widely. It is the key technique in sprite coding, which has been specified in MPEG 4. This new coding method outperforms the conventional coding method in MPEG 1 especially in low bit rate coding. Some comparative experiments are made on the reference software of MPEG 4 in order to validate the performance of proposed method for global motion estimation. Global motion estimation is accelerated and video coding is improved with the proposed method.更多还原