ICIP 2006, Atlanta, GA
 

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Atlanta Conv. & Vis. Bureau

 

Technical Program

Paper Detail

Paper:MP-P3.3
Session:Transcoding
Time:Monday, October 9, 14:20 - 17:00
Presentation: Poster
Title: CONSTANT-QUALITY CBR RATE-CONTROL ALGORITHMS FOR MPEG-4 VIDEO TRANSCODING
Authors: Cheng-Yu Pai; Concordia University 
 William E. Lynch; Concordia University 
Abstract: Two Constant Quality (CQ) CBR algorithms for MPEG-4 video transcoding (FLCQT and MVCQT) are proposed in this paper. These algorithms are developed based on the CQ CBR encoding algorithms in [4]. A new Laplacian rate/distortion model is developed to predict the transcoder output quality relative to the original. This model is then used by the proposed rate control algorithms to determine the frame QP (for FLCQT) or macroblock QP’s (for MVCQT). Simulation results suggest that the proposed transcoding algorithms generally give a lower quality variation with similar average PSNR and lower bitrate than the reference encoding and transcoding algorithms. Like [4], an extra degree of freedom is offered so that one can trade between lower PSNR variance and higher average PSNR.