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The necessity of computing rate-distortion costs for this decision is one reason to increase encoder complexity. In this paper, a fast transform skip mode decision method is proposed, which is based on the fast decision of rate-distortion cost calculation for transform skip mode, by considering frequency characteristics of residual signal.The proposed method can reduce × TU encoding time by about 27.1% with only about 0.03% consequential decrement in BDBR.

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