Chun-Ho Cheung

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Search patterns and the center-biased characteristics of motion vector distribution (MVD) have large impact on both searching speed and quality of block motion estimation. In this paper, we propose a novel algorithm using a rood-shaped search pattern as the initial step and large/small diamond search patterns as the subsequent steps for fast block motion(More)
In this paper, we propose two cross-diamond-hexagonal search (CDHS) algorithms, which differ from each other by their sizes of hexagonal search patterns. These algorithms basically employ two cross-shaped search patterns consecutively in the very beginning steps and switch using diamond-shaped patterns. To further reduce the checking points, two pairs of(More)
The quality control for video coding usually absents from many traditional fast block motion estimators. In this letter, a novel block-matching algorithm for fast motion estimation named the adjustable partial distortion search algorithm (APDS) is proposed. It is a new normalized partial distortion comparison method capable of adjusting the prediction(More)
In order to fit the small cross-center-biased characteristic of the real world video sequences, an improved version of the wellknown cross-diamond search algorithm (CDS) is proposed in this paper. Unlike traditional search pattern, such as square, diamond or cross – all are in vertically and horizontally symmetric shape, the kite-cross-diamond search (KCDS)(More)
The new upcoming video coding standard, H.264, allows motion estimation performing on multiple reference frames. This new feature improves the prediction accuracy of inter-coding blocks significantly, but it is extremely computational intensive. Its reference software adopts a full search scheme. The complexity of multi-frame motion estimation increases(More)