主観評価値の最大化に基づく動画像の時空間レート制御とその符号化への応用(<論文特集>画像処理・符号化とアプリケーション)

概要

論文の詳細を見る
Since the bandwidth required for real-time video communication cannot always be available on a network, the number of frames per second and the average bit amount for a single frame should be controlled suitably to obtain the highest possible video quality in a restricted bandwidth. To alleviate the problem, the authors have developed a spatio-temporal rate control technique that maximizes an estimation of MOS. From a practical point of view, however, this approach offers little freedom in coding-parameter tuning and in the frame rate control. Although improved techniques have been presented for these difficulties, a detailed encoding algorithm under the spatio-temporal rate control has not been investigated. This paper thus proposes a novel spatio-temporal rate control and video coding techniques based on our MOS estimation and frame rate control techniques, and it shows their validity and effectiveness. Some applications of the proposed technique are also discussed. We have determined that 75% of videos encoded by the proposed technique give almost equal or better subjective quality compared with the conventional fixed-frame-rate approach.
社団法人映像情報メディア学会の論文
2008-11-01