Technical Program

Paper Detail

Paper:IMDSP-P13.6
Session:Image and Video Coding and Quality
Time:Friday, May 21, 15:30 - 17:30
Presentation: Poster
Topic: Image and Multidimensional Signal Processing: Image and Video Coding
Title: AN ADAPTIVE CODING SCHEME USING AFFINE MOTION MODEL FOR MPEG P-VOP
Authors: Xiaohuan Li; Georgia Institute of Technology 
 Joel Jackson; Georgia Institute of Technology 
 Aggelos Katsaggelos; Northwestern University 
 Russell Mersereau; Georgia Institute of Technology 
Abstract: Block matching has been used for motion estimation and motioncompensation in MPEG standards for years. While it has anacceptable performance in describing motion between frames, itrequires quite a few bits to represent the motion vectors. Incertain circumstances, the use of whole frame affine motion models would perform equally well or even better than block matching in terms of motion accuracy, while it results in the coding of only 6 parameters. In this paper, we modify an MPEG-4 codec by adding (1) 6 affine model parameters to the frame header, (2) mode selection among INTRA, SKIP, INTER-16x16, INTER-8x8, and GLOBAL-AFFINE modes by Lagrange optimal rate-distortion criteria. Simulation results demonstrate 10-20% decrease in bit-rate, compared to the MMS' codec for an average coded P-frame with the same reconstruction PSNR.
 
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