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Proceedings Paper

Drift analysis for integer IDCT
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Paper Abstract

This paper analyzes the drift phenomenon that occurs between video encoders and decoders that employ different implementations of the Inverse Discrete Cosine Transform (IDCT). Our methodology utilizes MPEG-2, MPEG-4 Part 2, and H.263 encoders and decoders to measure drift occurring at low QP values for CIF resolution video sequences. Our analysis is conducted as part of the effort to define specific implementations for the emerging ISO/IEC 23002-2 Fixed-Point 8x8 IDCT and DCT standard. Various IDCT implementations submitted as proposals for the new standard are used to analyze drift. Each of these implementations complies with both the IEEE Standard 1180 and the new MPEG IDCT precision specification ISO/IEC 23002-1. Reference implementations of the IDCT/DCT, and implementations from well-known video encoders/decoders are also employed. Our results indicate that drift is eliminated entirely only when the implementations of the IDCT in both the encoder and decoder match exactly. In this case, the precision of the IDCT has no influence on drift. In cases where the implementations are not identical, then the use of a highly precise IDCT in the decoder will reduce drift in the reconstructed video sequence only to the extent that the IDCT used in the encoder is also precise.

Paper Details

Date Published: 8 October 2007
PDF: 16 pages
Proc. SPIE 6696, Applications of Digital Image Processing XXX, 669614 (8 October 2007); doi: 10.1117/12.740220
Show Author Affiliations
Arianne T. Hinds, InfoPrint Solutions Co. (United States)
Yuriy A. Reznik, Qualcomm Inc. (United States)
Lu Yu, Zhejiang Univ. (China)
Zhibo Ni, Zhejiang Univ. (China)
Cixun Zhang, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 6696:
Applications of Digital Image Processing XXX
Andrew G. Tescher, Editor(s)

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