【摘要】 在视频编码中,运动估计发挥着相当重要的作用,在很大程度上影响图像精度和压缩比例;同时运动估计也是编码器中复杂度高、运算量特别大的一部分,因此影响了H.264视频编码的实时应用。为了降低计算复杂度并保持图像质量,本文提出了一种整像素运动估计算法。结合UMHexagonS(非对称十字型多层次六边形格点搜索)算法和EPZS(增强的区域搜索)算法的特性,本文算法根据图像的运动类型不同采用不同的模板,同时加入了提前终止技术。实验结果证明该算法与FS(全搜索)、UMHexagonS和EPZS算法相比,在峰值信噪比(PSNR)基本相同的情况下减少了运动估计的时间。更多还原

【Abstract】 Motion Estimation(ME) plays an important role in digital video compression,since it can significantly affect the image accuracy and the compression ratio;meanwhile motion estimation process is a part of the encoder which is high complex and computation-intensive,therefore it hinders real-time applications of H.264 video compression.To reduce computational complexity and to maintain the same image quality,an integer pixel fast motion estimation algorithm is proposed in this paper.Combining the characters of the UMHexagonS algorithm and the EPZS algorithm,the proposed algorithm selects various search patterns according to the motion types of the image and introduces a early-termination algorithm.Experimental results demonstrate that the proposed algorithm has less ME time than FS,UMHexagonS,and EPZS algorithm with about the same PSNR.更多还原