Method for decoding television signals

Details Method for decoding television signals Method for decoding television signals

H - Electricity

04

N

H04N 7/01 (2006.01) H04N 9/78 (2006.01) H04N 11/20 (2006.01) H04N 9/11 (2006.01)

Patent

CA 2066702

2066702 9202102 PCTABS00010 A method for decoding National Television System Committee (NTSC) signals which exploits redundancies in film-to-NTSC transcoding, known as "3-2 pull-down". The decoding method estimates luma (Y) and chroma (C). The "3-2 pull-down" structure assigns three NTSC fields to one frame of a film frame pair, and two NTSC fields to the other film frame. Luma and chroma in different film frames are separated using different methods, and the separated signals are better than the separated signals achieved using conventional one dimensional and two dimensional NTSC decoding methods. The new method for separating luma and chroma from composite NTSC signals can be combined with an interlace-to-progressive method (22), which converts the decoded 3-2 NTSC signals (20) to two film frames, and an upconversion procedure (24), to yield improved image quality.

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