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A New Adaptive Window Size-based Three Step Search Scheme  

Yu Jonghoon (Depart of Electronic Engineering, Kwangwoon University, VLA-Multimedia Center)
Oh Seoung-Jun (Kwangwoon University, VLA-Multimedia Center)
Ahn Chang-bum (Kwangwoon University, VLA-Multimedia Center)
Park Ho-Chong (Kwangwoon University, VLA-Multimedia Center)
Publication Information
Abstract
With considering center-biased characteristic, NTSS(New Three-Step Search Algorithm) can improve the performance of TSS(Three-Step Search Algorithm) which is one of the most popular fast block matching algorithms(BMA) to search a motion vector in a video sequence. Although NTSS has generally better Quality than TSS for a small motion sequence, it is hard to say that NTSS can provide better quality than TSS for a large motion sequence. It even deteriorates the quality to increase a search window size using NTSS. In order to address this drawback, this paper aims to develop a new adaptive window size-based three step search scheme, called AWTSS, which can improve quality at various window sizes in both the small and the large motion video sequences. In this scheme, the search window size is dynamically changed to improve coding efficiency according to the characteristic of motion vectors. AWTSS can improve the video quality more than 0.5dB in case of large motion with keeping the same quality in case of small motion.
Keywords
motion; AWTSS; NTSS; BMA; window;
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