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Title: New DCT-domain transcoding using split and merge technique
Authors: Fung, KT
Siu, WC 
Issue Date: 2003
Source: 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.
Keywords: Video transcoder
DCT coefficients
Video downscaling
Publisher: IEEE
ISBN: 0-7803-7750-8
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.
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