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Title: DCT-based video frame-skipping transcoder
Authors: Fung, Kai-tat
Siu, Wan-chi
Subjects: DCT coefficients
Frame skipping transcoder
Adaptive transcoding architecture
MC macroblocks transcoding
Issue Date: 2003
Publisher: IEEE
Source: Proceedings of the 2003 IEEE International Symposium on Circuits and Systems : ISCAS 2003 : Sunday, May 25-Wednesday, May 28, 2003, Bangkok, Thailand, p. II656-II659.
Abstract: Due to high computational complexity and quality degradation introduced by conventional frame-skipping transcoders, a DCT-based video frame-skipping transcoder is proposed recently. However, the transcoding process of the motion compensated macroblocks in the DCT domain becomes the bottleneck since IDCT and DCT processes are required. In this paper, we propose a new architecture of the frame-skipping transcoder to reduce the computational complexity of motion compensated macroblocks in the frame-skipping process. The new architecture transcodes the dominant region of an MC macroblock in the DCT domain by making use of the DCT coefficients from the incoming bistream and some pre-computed shifting operators. By using OUT proposed shifted version of the dominant vector, the re-encoding errors introduced in the dominant region can be avoided. On the other hand, an adaptive transcoding architecture to transcode the boundary of MC marcoblocks and to perform error compensation of MC macroblocks boundary is also proposed. Experimental results show that, as compared to the conventional transcoder and DCT-based transcoder, the new architecture for frame-skipping transcoder is more robust to noise, gives rise to fewer requantization errors, and requires simple computational complexity.
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Type: Conference Paper
ISBN: 0-7803-7761-3
Appears in Collections:EIE Conference Papers & Presentations

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