Efficient Motion Vector Composition Algorithm by Activity Measurement for Downscaled Video Transcoder

Ching-Ting HSU  Mei-Juan CHEN  

Publication
IEICE TRANSACTIONS on Communications   Vol.E89-B   No.3   pp.1036-1039
Publication Date: 2006/03/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.3.1036
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Multimedia Systems for Communications" Multimedia Systems for Communications
Keyword: 
video transcoding,  downscaled video transcoder,  motion vector,  motion estimation,  DCT,  

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Summary: 
When the frame size is downscaled for video transcoding, the new motion vector (MV) must be computed. This paper presents an algorithm to utilize the activity measurement by DC value and the number of non-zero quantized DCT coefficients in the residual macroblock to compose the motion vector. It can reduce the complexity for motion estimation and improve the performance of the spatial domain video transcoder.