摘要： 针对预处理算法易在空域产生边缘模糊和在时域产生拖尾等图像扭曲现象，提出一种基于运动估计的时域滤波预处理算法。该方法通过运动补偿技术将时域滤波映射到空域进行处理，有效地去除视频序列时域不相关的细节信息，避免空域模糊和时域拖尾，达到降噪和提高编码效率的目的。实验结果表明，在同等视频质量PSNR下，该预处理算法较预处理前可降低编码码率12%~32%，同等码率下视频序列的平均PSNR值比使用空域预处理方法高4 dB~9 dB。

关键词: 预处理, 运动估计, 滤波, 码率降低

Abstract: In order to eliminate the artifacts such as edge blur and image “ghosting” (motion blur) when applying the existing pre-processing algorithm to video sequences, an adaptive pre-processing algorithm based on motion-estimation is proposed for noise reduction and bit-rate decrease. This algorithm which maps temporal-filtering into spatial-filtering can avoid edge and motion blur and de-noise and enhance coding-ratio. The algorithm is applied to H.264 video code JM9.8 and experimental results show the bit-rate can decrease by 12%~32% under the condition of the same PSNR. Up to 9 dB PSNR higher is achieved compared with results of the existing methods.

Key words: pre-processing, motion-estimation, filtering, bit-rate-decrease

中图分类号: 

• TP312