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Implementation of an adaptive block filter on sub-blocks of a macroblock in H.264/AVC.

机译:在H.264 / AVC中,在宏块的子块上实现自适应块滤波器。

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摘要

Plenty of coding tools are being developed to boost the efficiency of H.264/AVC. Some of these tools are implemented in the key technical area (KTA). The adaptive interpolation filter (AIF), the high precision interpolation filter, and the adaptive loop filter (ALF) have already been introduced in order to provide a more precise reference picture. Other efficient coding methods, such as the motion vector competition and the extended macro-block (MB), are also implemented in the KTA.;In order to improve the coding efficiency of H.264/AVC, an adaptive prediction block filter (APBF) based on Wiener filter is implemented on every sub-block (SB) of a macro-block (MB) where each MB is decomposed into 4x4 SBs. For each SB using the prediction and reconstruction results of the neighboring SBs the filter coefficients are calculated. The proposed filter is applied to the prediction block of the current SB, and the filtered block is selectively used depending on the rate-distortion (RD) cost. For each SB, if the APBF is used, by reducing the number of bits required for encoding the residual signal between the prediction and original signal of the SB, the coding efficiency is improved. Additionally, as the same filter coefficients can be obtained in the decoder, they do not need to be encoded into the bit-stream. The proposed method achieves a 5.04% bitrate saving on an average when compared to H.264/AVC.
机译:正在开发大量的编码工具以提高H.264 / AVC的效率。其中一些工具是在关键技术领域(KTA)中实现的。为了提供更精确的参考图片,已经引入了自适应插值滤波器(AIF),高精度插值滤波器和自适应环路滤波器(ALF)。在KTA中还实现了其他有效的编码方法,例如运动矢量竞争和扩展宏块(MB)。为了提高H.264 / AVC的编码效率,自适应预测块滤波器(APBF)在微块(MB)的每个子块(SB)上实现基于Wiener滤波器的算法,其中每个MB分解为4x4 SB。对于使用相邻SB的预测和重建结果的每个SB,计算滤波器系数。所提出的滤波器被应用于当前SB的预测块,并且根据率失真(RD)成本来选择性地使用滤波后的块。对于每个SB,如果使用APBF,则通过减少对SB的预测信号和原始信号之间的残差信号进行编码所需的位数,可以提高编码效率。另外,由于可以在解码器中获得相同的滤波器系数,因此不需要将它们编码为比特流。与H.264 / AVC相比,该方法平均可节省5.04%的比特率。

著录项

  • 作者

    Prabhakar, Bhavana.;

  • 作者单位

    The University of Texas at Arlington.;

  • 授予单位 The University of Texas at Arlington.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 M.Engr.
  • 年度 2013
  • 页码 77 p.
  • 总页数 77
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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