| 张然峰,郝贤鹏,吕增明,韩双丽,李进.适于航空面阵CCD相机的H.264编码帧内预测算法[J].光电子激光,2014,(8):1558~1564 |
| 适于航空面阵CCD相机的H.264编码帧内预测算法 |
| Intra-prediction algorithm of the H.264standard for aerial area CCD camera |
| 投稿时间：2013-12-25 |
| DOI： |
| 中文关键词: 面帧CCD相机 视频压缩 H.264压缩 最小平方预测 |
| 英文关键词:area CCD camera video compression H.264compression least-squares prediction |
| 基金项目:吉林省科技发展计划(20130522102JH)资助项目 (1.中国科学院长春光学精密机械与物理研究所,吉林 长春 130033; 2.中国科学院研究生院北京 100039) |
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| 中文摘要: |
| 为了提高H.264中帧内预测压缩编码效率,提出一 种适于航空面阵CCD相机应用的H.264的新的帧内预测模式。 其基本思想为:一个块中的每个像素预测值使用周围像素和权重 采用一个N阶线性预测器计算得到, 而权重值是由重构像素中与待编码像素的邻近块计算得到,可参考的邻近块使用l1范数评估。而权重值并不需要传 输到解码器中而耗用大量时间。在H.264参考软件JM17.6上的实验结果表明, 本文提出的帧内预测算 法具有很好的率失真(RD)性能,与标准H.264帧内预测算法比较,对于图像而言,PSNR增加了0.57～0.17dB,比特率减少了 9.71~3.94%；对于CIF格式视频序列,PSNR增加了0.05~0.14dB ,比特率减少了1.23~1.52%；对于720p50格式视频 序列,PSNR增加了0.01~0.05dB,比特率减少了0.25~0.47%。因 此,本文算法非常适于航空面阵CCD相机的应用。 |
| 英文摘要: |
| In order to improve the coding efficiency for intra-prediction in H.264,we propose a novel intra-prediction mode of the H.264standard for aerial area CCD camera in this paper.The idea of the proposed intra-prediction mode is that each pixel within a block is predicted by a weighted sum of its neighbors,according to an N-th order linear predictor.The weights are obtained from reconstructed data in the neighbor blocks which are selected b y l1-norm-based approach.Therefore,the decoder doesn′t need to convey the weights to the decoder,which c an be very time consuming.Finally,the proposed intra-prediction mode is implemented in H.264reference software JM17.6.The ex perimental results show that the proposed intra prediction algorithm has better rate-distortion (RD) performance.Compare d with the intra prediction for regular H.264standard,the proposed method could improve the average peak signal to-noise rat io (PSNR) by 0.57－0.17dB fo r images,0.05－0.14dB for CIF-resolution sequences,0.01－0.05dB for 720p50-resolution sequences,while the bit-reductions are 9.71－3.94%, 1.23%－1.52%,0.25%－0.47%,respectively.It is suitable for the application in ae rial area CCD camera. |
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