Color Adaptation of Videos for Mobile Devices

A large number of recorded videos cannot be viewed on mobile devices (e.g., PDAs or mobile phones) due to inappropriate screen resolutions or color depths of the displays. Recently, automatic transcoding algorithms have been introduced which facilitate the playback of previously recorded videos on new devices. One major challenge of transcoding is the preservation of the semantic content of the videos. Although much work was done on the adaptation of the image resolution, color adaptation of videos has not been addressed in detail before. In this paper, we present a novel color adaptation algorithm for videos which preserves the semantics. In our approach, the color depth of a video is adapted to facilitate the playback of videos on mobile devices which support only a limited number of different colors. We analyze our adaptation approach in the experimental results, visualize adapted keyframes and illustrate, that we obtain a better quality and are able to recognize much more details with our approach.