ICIP 2006, Atlanta, GA
 

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Atlanta Conv. & Vis. Bureau

 

Technical Program

Paper Detail

Paper:WA-P2.4
Session:Video Coding - I
Time:Wednesday, October 11, 09:40 - 12:20
Presentation: Poster
Title: A CONVEX OPTIMIZATION-BASED FRAME-LEVEL RATE CONTROL ALGORITHM FOR MOTION COMPENSATED HYBRID DCT/DPCM VIDEO CODING
Authors: Qing Wu; University of Hong Kong 
 Shing-Chow Chan; University of Hong Kong 
 Heung-Yeung Shum; Microsoft Research, China 
Abstract: This paper presents a convex optimization-based frame-level rate control algorithm for motion compensated hybrid DCT/DPCM video coding. By modifying the existing rate-distortion models, an improved empirical rate-distortion model with more flexibility is proposed to explain the experimental observations. The convexity and monotonicity of the proposed model are exploited to formulate the frame-level bit allocation problem as a convex programming problem. Thus the bit allocation among the frames with different picture types can be solved using convex programming methods such as the interior-point methods, if the optimal solution exists. Different importance weights for various picture types (I-, P-, etc) can also be incorporated into the scheme in order to account for the relative importance of different picture types due to their inter-dependency. The relevant model parameters are updated using previously encoded frames by means of linear regression. Simulation results show that the proposed algorithm achieves a considerably better picture quality in terms of PSNR than the conventional approaches for the tested video sequences. Therefore, it is a good alternative to these conventional approaches.