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Proceedings Paper

Intra prediction with spatial gradient
Author(s): Shohei Matsuo; Seishi Takamura; Kazuto Kamikura; Yoshiyuki Yashima
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Paper Abstract

Spatial intra prediction has been added recently to the latest video coding standard H.264/AVC. In the intra prediction of H.264/AVC, there are 9, 9 and 4 prediction modes for 4×4, 8×8 and 16×16 blocks, respectively. Prediction signals are generated by using one or several reference pixels. The value of a reference pixel is copied as the prediction value. In some prediction modes, we calculate a weighted mean by averaging several pixels. The same prediction value is copied to several of the pixels lying in the prediction direction. However, if original image has patterns like gradations, the residual energy could increase which would result in low coding efficiency. In this paper, we propose a new intra prediction that generates prediction signals with a spatial gradient to deal with this problem. Simulation results show that it improves the picture quality and reduce the bit-rate by about 0.14 dB and 1.0 % on average for CIF sequences, respectively. It is also confirmed that our method is effective at high bit-rates.

Paper Details

Date Published: 19 January 2009
PDF: 9 pages
Proc. SPIE 7257, Visual Communications and Image Processing 2009, 72571R (19 January 2009); doi: 10.1117/12.806366
Show Author Affiliations
Shohei Matsuo, NTT Corp. (Japan)
Seishi Takamura, NTT Corp. (Japan)
Kazuto Kamikura, NTT Corp. (Japan)
Yoshiyuki Yashima, NTT Corp. (Japan)

Published in SPIE Proceedings Vol. 7257:
Visual Communications and Image Processing 2009
Majid Rabbani; Robert L. Stevenson, Editor(s)

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