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Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/267

Title: New DCT-domain transcoding using split and merge technique
Authors: Fung, Kai-tat
Siu, Wan-chi
Subjects: Video transcoder
DCT coefficients
Video downscaling
Issue Date: 2003
Publisher: IEEE
Citation: 2003 International Conference on Image Processing : ICIP-2003 : proceedings : September 14-17, 2003, Barcelona, Spain, p. I197-I200
Abstract: For the conventional downscaling video transcoder, the video server would be to first decompress the video, perform the downscaling operation in the pixel domain, and then recompress it. This is computational intensive. However, it is difficult to perform video downscaling in the DCT-domain since the prediction errors of each frame are computed from its immediate past higher resolution frames. Besides, the motion vector need to resample due to the size of the video is changed. Due to the mismatch of the resampled motion vector with the incoming DCT coefficients, the video transcoder need to recalculate the new DCT coefficient with lower resolution in pixel domain; this can create undesirable complexity as well as introduce re-encoding error. In this paper, we propose a new architecture to obtain the new DCT coefficients and the new motion vector by reuse the incoming motion vector and DCT coefficients. Since our proposed transcoder is mainly performing in DCT domain, low computational complexity can be achieved as well as the re-encoding can be reduced. Experimental result show that our proposed video downscaling transcoder can lead to significant computational savings as well as provide a high video quality compared to the conventional approach.
Rights: © 2003 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
Type: Conference Paper
URI: http://hdl.handle.net/10397/267
ISBN: 0780377508
Appears in Collections:EIE Conference Papers & Presentations

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