Intra prediction with spatial gradient

Shohei Matsuo; Seishi Takamura; Kazuto Kamikura; Yoshiyuki Yashima

doi:10.1117/12.806366

19 January 2009 Intra prediction with spatial gradient

Shohei Matsuo, Seishi Takamura, Kazuto Kamikura, Yoshiyuki Yashima

Proceedings Volume 7257, Visual Communications and Image Processing 2009; 72571R (2009) https://doi.org/10.1117/12.806366
Event: IS&T/SPIE Electronic Imaging, 2009, San Jose, California, United States

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.

Citation Download Citation

Shohei Matsuo, Seishi Takamura, Kazuto Kamikura, and Yoshiyuki Yashima "Intra prediction with spatial gradient", Proc. SPIE 7257, Visual Communications and Image Processing 2009, 72571R (19 January 2009); https://doi.org/10.1117/12.806366

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available