改进视频编码中的帧内预测，降低码率2%。
Position Dependent Prediction Combination For Intra-Frame Video Coding
- 用非递归预测器替代递归滤波，提升效率。
- 根据模式和块大小动态组合平滑与原始预测值。
- 适合需要高效视频压缩的场景，如实时传输。
HEVC标准中的帧内预测可通过应用多组二维递归滤波器对预测值进行优化，但该方法难以实现像素预测的并行计算。本文分析了递归滤波有效的原因，并据此推导出性能更优的非递归预测器。提出一种扩展的HEVC帧内预测方法，根据预测模式和块大小，动态组合未滤波与滤波（平滑）参考样本的预测值。在HEVC通用测试条件下仿真表明，与HEVC相比，所有帧内（All Intra, AI）配置可实现平均2.0%的码率降低。
原文摘要 · Abstract (English)
Intra-frame prediction in the High Efficiency Video Coding (HEVC) standard can be empirically improved by applying sets of recursive two-dimensional filters to the predicted values. However, this approach does not allow (or complicates significantly) the parallel computation of pixel predictions. In this work we analyze why the recursive filters are effective, and use the results to derive sets of non-recursive predictors that have superior performance. We present an extension to HEVC intra prediction that combines values predicted using non-filtered and filtered (smoothed) reference samples, depending on the prediction mode, and block size. Simulations using the HEVC common test conditions show that a 2.0% bit rate average reduction can be achieved compared to HEVC, for All Intra (AI) configurations.
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