This paper focuses on the mode decision and motion selection problem when H.264\/AVC video streams are transcoded in spatial resolution. A fast downsizing transcoding scheme is developed in which a new ratedistortion (R-D) optimal mode decision mechanism is presented for high speed transcoding as well as high coding efficiency. A model for estimating relative prediction errors is applied in this paper, which is free from computation of interpolation and SAD\/SSD computation. Based on the selected model, a motion refinement within a distance of 1 pixel is performed after mode decision. Experimental results demonstrate that our method can significantly speed up the spatial resolution reduction process, while achieving high coding efficiency.<\/p>\n","protected":false},"excerpt":{"rendered":"
This paper focuses on the mode decision and motion selection problem when H.264\/AVC video streams are transcoded in spatial resolution. A fast downsizing transcoding scheme is developed in which a new ratedistortion (R-D) optimal mode decision mechanism is presented for high speed transcoding as well as high coding efficiency. A model for estimating relative prediction […]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":null,"msr_publishername":"","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"International Conference on Multimedia & Expo (ICME)","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"","msr_number":"","msr_organization":"","msr_pages_string":"685-688","msr_page_range_start":"685","msr_page_range_end":"688","msr_series":"","msr_volume":"","msr_copyright":"","msr_conference_name":"International Conference on Multimedia & Expo 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