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在H.264/AVC视频编码过程中,编码时间受诸多因素影响,如帧间/帧内模式选择、率失真优化(RDO)等.JVT(Jo int Video Team)提供的参考软件采用全搜索算法进行帧内预测,其算法复杂度很高.为此,提出一种基于Radon变换的快速预测算法,通过对4×4块进行Radon变换求取其纹理方向,根据求取的纹理方向减少4×4块的预测模式,有效的降低了预测时间.实验结果表明本算法在信噪比和码率变化极小的情况下,编码速度有显著提高.
In H.264 / AVC video coding, coding time is affected by many factors such as inter / intra mode selection, rate-distortion optimization (RDO), etc. The reference software provided by the JVT (Jo int Video Team) uses a full search algorithm And the complexity of the algorithm is very high.Therefore, a fast prediction algorithm based on Radon transform is proposed, and its texture direction is obtained by Radon transform of 4 × 4 blocks, which is reduced by 4 × 4 block prediction mode, which effectively reduces the prediction time.The experimental results show that the coding speed is significantly improved in the case of very small changes in signal-to-noise ratio and bit rate.