Adaptive block transforms for hybrid video coding

Mathias Wien; Claudia Mayer

doi:10.1117/12.411793

29 December 2000 Adaptive block transforms for hybrid video coding

Mathias Wien, Claudia Mayer

Proceedings Volume 4310, Visual Communications and Image Processing 2001; (2000) https://doi.org/10.1117/12.411793
Event: Photonics West 2001 - Electronic Imaging, 2001, San Jose, CA, United States

Abstract

Today's standard video coders employ the hybrid coding scheme on a macroblock basis. In these coders blocks of 16 X 16, and 8 X 8 pixel are used for motion compensation of non- interlaced video. The Discrete Cosine Transform (DCT) is then applied to the prediction error on blocks of size 8 X 8. The emerging coding standard H.26L employs a set of seven different block sizes for motion compensation. The size of these blocks varies from 4 X 4 to 16 X 16. The block sizes smaller than 8 X 8 imply that the 8 X 8 DCT cannot be used for transform coding of the prediction error. In the current test model an integer approximation of the 4 X 4 DCT matrix is employed. In this paper the concept of Adaptive Block Transforms is proposed. In this scheme, the transform block size is adapted to the block sizes used for motion compensation. The transform exploits the maximum possible signal length for transform coding without exceeding the compensated block boundaries. The proposed scheme is integrated into the H.26L test model. New integer approximations of the 8 X 8 and 16 X 16 DCT matrices are introduced. Like the TML 4 X 4 transform the coefficient values of these matrices are restricted to a limited range. The results presented here are based on an entropy estimation. They reveal an increased rate/distortion performance of approximately 1.1 dB for high rates on the employed test sequences.

Citation Download Citation

Mathias Wien and Claudia Mayer "Adaptive block transforms for hybrid video coding", Proc. SPIE 4310, Visual Communications and Image Processing 2001, (29 December 2000); https://doi.org/10.1117/12.411793

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Transform theory

Matrices

Printed circuit board testing

Quantization

Motion models

Video coding

Motion estimation

Show All Keywords

Keywords/Phrases

Search In:

Publication Years