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Improved SAP based on adaptive directional prediction for HEVC lossless intra prediction

机译：基于自适应方向预测的改进SAP用于HEVC无损帧内预测

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In HEVC (High Efficiency Video Coding), linear interpolation of the boundary pixels is used as the predictor and pixels within the same PU (Prediction Unit) are in the same prediction direction. When the PU block is large and in high complexity, the prediction performance would worsen. Although many algorithms use the pixel-based weighted averaging or interpolation operations to perform the prediction which improves the performance of bitrate saving notably, there is still space for further improvement. This paper proposed an improved SAP (Sample-based Angular Prediction) algorithm based on adaptive directional prediction (ADSAP). The innovation of this paper lies in two aspects: it puts forward a new method to estimate the best prediction direction of current pixel and it introduces the concept of "frame-level pretreatment" which could greatly improve the encoding speed. Experimental results show that it could save the output bitrate by about 9.4158% when compared with the HEVC lossless intra prediction algorithm, which is better than other typical algorithms. Besides, the encoding and decoding time are reduced by about 11%. Moreover, when the minimum PU size gets larger, the increase of output bitrate of ADSAP is much less than that of HEVC and the conventional SAP algorithm, which makes the proposed algorithm quite suitable for the compression of high resolution videos. (C) 2015 Elsevier Inc. All rights reserved.
机译：在HEVC（高效视频编码）中，边界像素的线性插值被用作预测器，并且同一PU（预测单元）内的像素在相同的预测方向上。当PU块大且具有高复杂度时，预测性能将变差。尽管许多算法使用基于像素的加权平均或内插运算来执行预测，从而显着提高了节省比特率的性能，但仍有进一步改进的空间。本文提出了一种改进的基于自适应方向预测（ADSAP）的SAP（基于样本的角度预测）算法。本文的创新之处在于两个方面：提出了一种估计当前像素最佳预测方向的新方法，并引入了“帧级预处理”的概念，可以大大提高编码速度。实验结果表明，与HEVC无损帧内预测算法相比，该算法可以节省约9.4158％的输出比特率，优于其他典型算法。此外，编码和解码时间减少了约11％。此外，当最小PU尺寸变大时，ADSAP的输出比特率的增加远小于HEVC和常规SAP算法的增加，这使得该算法非常适合于高分辨率视频的压缩。 （C）2015 Elsevier Inc.保留所有权利。

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