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Adaptive intra prediction filtering (AIPF)

机译:自适应帧内预测过滤(AIPF)

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摘要

Intra prediction is an important coding tool to exploit correlation within one picture in image and video compression. Before the ultimate intra prediction values are generated for current block along oblique angles, a fixed low-pass filtering with 3-tap filter (1, 2, 1) will be applied to the three prediction pixel values to avoid the effect of pulse noise. In this paper, we use adaptive intra prediction filter (AIPF) to replace the fixed filter to minimize the prediction errors. To get the adaptive filter coefficients in an on-line way with an acceptable accuracy and no coding overhead, we combine it with template matching (TM). After the best estimation of current block through template matching, the optimal adaptive filter coefficients are calculated with least-square optimization through considering the best estimation as ‘current’ block. The adaptive filter is used to obtain intra prediction values instead of the 3-tap fixed low-pass filter. Experimental results show that the AIPF can get a stable coding gain on all test sequences, and reduce the bit-rate by up to 1.74% comparing with that using only TM.
机译:帧内预测是一种重要的编码工具,可在图像和视频压缩中利用一张图片内的相关性。在沿倾斜角度为当前块生成最终帧内预测值之前,将对三个预测像素值应用带有3抽头滤波器(1、2、1)的固定低通滤波,以避免脉冲噪声的影响。在本文中,我们使用自适应帧内预测滤波器(AIPF)来代替固定滤波器,以最大程度地减少预测误差。为了以可接受的精度以在线方式获得自适应滤波器系数,并且没有编码开销,我们将其与模板匹配(TM)结合使用。通过模板匹配对当前块进行最佳估计后,通过将最佳估计视为“当前”块,以最小二乘法优化计算出最佳自适应滤波器系数。自适应滤波器用于获取帧内预测值,而不是3抽头固定低通滤波器。实验结果表明,与仅使用TM相比,AIPF可以在所有测试序列上获得稳定的编码增益,并且可以将比特率降低多达1.74%。

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