Block-adaptive quantization of multiple-frame motion field

Fabio Lavagetto; Riccardo Leonardi

doi:10.1117/12.50262

1 November 1991 Block-adaptive quantization of multiple-frame motion field

Fabio Lavagetto, Riccardo Leonardi

Proceedings Volume 1605, Visual Communications and Image Processing '91: Visual Communication; (1991) https://doi.org/10.1117/12.50262
Event: Visual Communications, '91, 1991, Boston, MA, United States

Abstract

This paper presents a method for the adaptive quantization of the motion field obtained from multiple reference frames. The motion estimation is obtained through a block-matching technique, with the assumptions of pure translational motion and uniform motion within a block. The regular assumption of constant intensity along the motion trajectory in the spatio-temporal path is relaxed. On one hand, this allows for illumination changes between the reference frames and the frame to be motion-compensated. On the other hand, it allows for additional freedom to reduce the prediction error after motion-compensation when the translational and rigid body motion assumptions are violated. The matching function represents the difference for each block of the luminance signal in the frame to be encoded with respect to a linear combination of 2 displaced blocks of same size in the reference frames. The adaptive quantization mechanism is based on evaluating, on a block basis, the local sensitivity of the displaced frame difference signal to a quantization of the motion field parameters. It is shown how such sensitivity depends only on the reference frame signals, which allows to keep it below a desired threshold without additional information to be sent to a receiver. Simulations are carried out on standard CIF (240x360) source material provided to the ISO/MPEG. Results are discussed to show the improvement with respect to the strategy suggested in the draft recommendation of the ISO MPEG for interactive video at 1.5 Mbps.

Citation Download Citation

Fabio Lavagetto and Riccardo Leonardi "Block-adaptive quantization of multiple-frame motion field", Proc. SPIE 1605, Visual Communications and Image Processing '91: Visual Communication, (1 November 1991); https://doi.org/10.1117/12.50262

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