Television – Format conversion – Line doublers type
Patent
1997-08-25
1999-08-10
Lee, Michael H.
Television
Format conversion
Line doublers type
348451, H04N 701, H04N 1120
Patent
active
059366761
ABSTRACT:
Apparatus and method for producing an output non-interlaced, progressive video component signal from an input interlaced video signal by mixing lines of the interlaced video component signal with lines of a calculated signal. A preferred embodiment adaptively combines three interpolation techniques. They include a steered spatio-temporal interpolation for moving edges, a vertical interpolation for vertically moving horizontal lines and a temporal interpolation for local still picture parts. Robust detectors associated respectively with the above interpolations are also provided. The edge direction detector is composed of subband filters, five oriented differentiators and logical filters for reliable direction decision making. The vertical motion detector for horizontal edges introduced for reducing the horizontal line flicker is composed of temporally directional differentiators working on lowpass filtered signal, a decision device and logical filters. A local moving/still part detector based on the four-field information controls a temporal motion detector to produce the calculated signal.
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T. Doyle and M. Looymans, "Progressive Scan Conversion using Edge Information", Signal Processing of HDTV, II, L. Chiariglione (ed.) Elsevier Science Publishers B.V., 1990, pp. 711-721.
Takahiko Fukinuki and Yasuhiro Hirano, "Extended Definition TV Fully Compatible with Existing Standards", IEEE Transactions on Communications, vol. Com-32, No. 8, Aug. 1984, pp. 948-953.
Kieu Cong Toai
Ledinh Chon Tam
Poirier Daniel
Lee Michael H.
Miranda Technologies Inc.
Renault Swabey Ogilvy
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