title: Video compression for lossy packet networks with mode switching and a dual-frame buffer.
abstract: Video codecs that use motion compensation benefit greatly from the development of algorithms for near-optimal intra/inter mode switching within a rate-distortion framework. A separate development has involved the use of multiple-frame prediction, in which more than one past reference frame is available for motion estimation. In this paper, we show that using a dual-frame buffer (one short-term frame and one long-term frame available for prediction) together with intra/inter mode switching improves the compression performance of the coder. We improve the mode-switching algorithm with the use of half-pel motion vectors. In addition, we investigate the effect of feedback in making more informed and effective mode-switching decisions. Feedback information is used to limit drift errors due to packet losses by synchronizing the long-term frame buffers of both the encoder and the decoder.
authors.affiliation: Department of Electrical and Computer Engineering, University of California at San Diego, La Jolla, CA 92093-0407, USA. aleontar@code.ucsd.edu
authors.forename: Athanasios
authors.initials: A
authors.lastname: Leontaris
authors.forename: Pamela C
authors.initials: PC
authors.lastname: Cosman
mesh_terms: D000465:Algorithms; D016477:Artifacts; D001185:Artificial Intelligence; D044962:Data Compression / Q000379:methods*; D007089:Image Enhancement / Q000379:methods*; D020407:Internet; D010363:Pattern Recognition, Automated / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D013382:Subtraction Technique; D014741:Video Recording / Q000379:methods*