Region-based coding scheme for the transmission of video sequences via channels of varying very low bit rate

Apostolos Saflekos; Jenny Benois-Pineau; Dominique Barba

doi:10.1117/12.263284

10 January 1997 Region-based coding scheme for the transmission of video sequences via channels of varying very low bit rate

Apostolos Saflekos, Jenny Benois-Pineau, Dominique Barba

Author Affiliations +

Proceedings Volume 3024, Visual Communications and Image Processing '97; (1997) https://doi.org/10.1117/12.263284
Event: Electronic Imaging '97, 1997, San Jose, CA, United States

Abstract

Region-based coding methods can provide a solution of maximal quality for the transmission of video sequences through channels of low bit-rate due to their 'scene- adaptive' nature. Here, the visual quality of frames predicted by motion compensation on nearly semantic homogeneous regions is better than for the conventional block-based and quad-tree based methods. If the error signal is not encoded, the most bit-consuming component is the description of the regions borders and of the topology of the segmentation map. A planar graph with polygonal arcs is used to represent the geometrical form and relations of regions in each frame. A method allowing to adapt the segmentation description to the variable available bit-rate is proposed based on rate-distortion theory and constrained optimization. The method uses the concept of description layers. The 'basic' layer contains only the triplet nodes of the graph and the vertices of the highest contrast and curvature. The 'maximal enhancement' layer contains all the nodes and polygonal vertices of the segmentation graph. The choice of 'optimal' layer for each polygonal arc is done independently, minimizing Lagrangian cost function. The last one combines rate and distortion measures. The entropy estimates for the encoding of all vertices of a given arc are taken as the rate measure. The distortion measure is the total sum of squared DFD in the area delimited by the basic layer and maximal enhancement layer for a given arc. The experiments on the 420-625 CCIR videoconference sequence showed a 30 percent decrease of the bit-rate for an unnoticeable loss in quality.

Citation Download Citation

Apostolos Saflekos, Jenny Benois-Pineau, and Dominique Barba "Region-based coding scheme for the transmission of video sequences via channels of varying very low bit rate", Proc. SPIE 3024, Visual Communications and Image Processing '97, (10 January 1997); https://doi.org/10.1117/12.263284

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