H.264中一种改进的基于结构相似性的运动估计方法
n improved motion estimation method based on structural similarity for H.264
在H.264的运动估计中，我们通过Lagrange代价函数来选择最佳匹配块和最佳预测模式。而Lagrange代价函数中的失真矩阵是绝对误差和（SAD），它与均方误差（MSE）或者峰值信噪比（PSNR）有着类似的含义。人们提出了一种被称为结构相似性（SSIM）的图像测量法。实践证明，对于被感知的图像失真，SSIM可以提供一种比目前广泛使用的PSNR或者MSE更好的近似。本文介绍了一种改进的基于SSIM的运动估计方法，将此方法用于H.264的帧间编码中。实验结果显示，在保持相同主观图像质量的情况下，这种改进的基于结构相似性的运动估计法（MEBSS）可以平均减少20%的比特率和2%的编码时间，其中最多可以减少超过50%的比特率。
In the motion estimation of H.264, the best matching blocks and the best prediction modes are chosen by Lagrange cost function whose distortion metric is the sum of absolute (transformed) differences which has similar meaning with MSE or PSNR. Recently an image measurement called Structural Similarity (SSIM) based on the degradation of structural information was brought forward. It is proved that the SSIM can provide a better approximation for the perceived image distortion than the currently used PSNR (or MSE). In this article, I propose an improved motion estimation method based on SSIM for H.264 inter coding. Experiment results show that the method called MEBSS can reduce average 20% bit rate and 2% encoding time while maintaining the same perceptual video quality, and the maximum reduction in bit rate is more than 50%.
张士君
通信
H.264，帧间预测，结构相似性，运动估计
H.264，Inter prediction，Structural similarity，Motion estimation
张士君.H.264中一种改进的基于结构相似性的运动估计方法[EB/OL].(2007-03-27)[2025-08-21].http://www.paper.edu.cn/releasepaper/content/200703-484.点此复制
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