Fast Prediction Mode Decision in HEVC Using a Pseudo Rate‐Distortion Based on Separated Encoding Structure

A novel fast algorithm is suggested for a coding unit (CU) mode decision using pseudo rate‐distortion based on a separated encoding structure in High Efficiency Video Coding (HEVC). A conventional HEVC encoder requires a large computational time for a CU mode prediction because prediction and transf...

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Bibliographic Details
Published in:ETRI journal 2016, 38(5), , pp.807-817
Main Authors: Seok, Jinwuk, Kim, Younhee, Ki, Myungseok, Kim, Hui Yong, Choi, Jin Soo
Format: Article
Language:English
Subjects:
HEVC
pseudo
ratedistortion
Video encoding
전자/정보통신공학
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Summary:A novel fast algorithm is suggested for a coding unit (CU) mode decision using pseudo rate‐distortion based on a separated encoding structure in High Efficiency Video Coding (HEVC). A conventional HEVC encoder requires a large computational time for a CU mode prediction because prediction and transformation procedures are applied to obtain a rate‐distortion cost. Hence, for the practical application of HEVC encoding, it is necessary to significantly reduce the computational time of CU mode prediction. As described in this paper, under the proposed separated encoder structure, it is possible to decide the CU prediction mode without a full processing of the prediction and transformation to obtain a rate‐distortion cost based on a suitable condition. Furthermore, to construct a suitable condition to improve the encoding speed, we employ a pseudo rate‐distortion estimation based on a Hadamard transformation and a simple quantization. The experimental results show that the proposed method achieves a 38.68% reduction in the total encoding time with a similar coding performance to that of the HEVC reference model.
ISSN:1225-6463
2233-7326
DOI:10.4218/etrij.16.2615.0031