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Analysis of Dyadic Approximation Error for Hybrid Video Codecs With Integer Transforms

机译:具有整数变换的混合视频编解码器的二进近似误差分析

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In this paper, we present an analysis of the dyadic approximation error introduced by the integerization of transform coding in H.264/AVC-like codecs. We derive the analytical formulations for dyadic approximation error and nonorthogonality error. We further classify the dyadic approximation error into a “system error” and a “nonflat error,” and proposed two models for them. We found that the “nonflat error” has a substantial impact on video quality if the number of shifting bits at decoder side (DQ_BITS) is small. We also give a theoretical justification on why scaling factors at encoder side are better to be adapted to the rescaling factors at decoder side in H.264/AVC-like codecs.
机译:在本文中,我们对类H.264 / AVC编解码器中的变换编码整数化引入的二进逼近误差进行了分析。我们推导了二进位近似误差和非正交误差的解析公式。我们进一步将二元近似误差分为“系统误差”和“非平坦误差”,并为它们提出了两个模型。我们发现,如果解码器端的移位位数(DQ_BITS)很小,则“非平坦误差”会对视频质量产生重大影响。我们还给出了理论依据,说明为什么在类似H.264 / AVC的编解码器中,编码器端的缩放因子更好地适合于解码器端的缩放因子。

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