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Further improved Edge-Directed Interpolation and fast EDI for SDTV to HDTV conversion

High quality video interpolation is always desirable, since the definition of video display devices is improving. It is always necessary to port a video of lower quality to higher quality displays, such as the conversion of SDTV videos to HDTV videos. In this paper we will present a further improved Edge-Directed Interpolation (EDI) by proposing a new sampling pattern and subsequently give a fast approach for the enlargement of a SDTV (704×480) video into a HDTV (1280×720) video (1.5 time enlargement). Experimental results show that our approach has a better performance in terms of edge quality compared to that of the New Edge-Directed Interpolation (NEDI) in the literature. Moreover, the fast approach is 50% faster and the visual quality is also better than the NEDI.