Television – Format conversion – Line doublers type
Patent
1997-06-04
2000-05-30
Powell, Mark R.
Television
Format conversion
Line doublers type
348441, 348446, 348458, 348459, H04N 701
Patent
active
060696648
ABSTRACT:
The present invention is embodied in an apparatus and method for converting a progressive video signal to an interlaced video signal from which the progressive video signal may be recovered. The invention is further embodied in an apparatus and method for converting such an interlaced video signal to a progressive video signal. A progressive-to-interlaced video converter includes a progressive video preprocessor and a converter. The progressive video preprocessor replaces at least one scan line in a video frame by its preceding or succeeding scan line. Alternatively, the preprocessor may assign a predetermined value to one or multiple scan lines at appropriate position(s) in a frame. In either scenario, each frame will carry at least one redundant scan line. The frame modification information will be encoded to an ancillary data section of a digital video stream. An interlaced-to-progressive video converter includes an ancillary data preprocessor, a recursive interlaced-to-progressive converter and two digital standards converters. The preprocessor decodes original frame modification information from the ancillary data section of a digital video stream and provides decoding parameters to the interlaced-to-progressive converter. A digital standards converter is used to convert the resulting 24-frame-per-second progressive video signal to a 60-frame-per-second progressive video signal using a 3:2 pull down. A second digital standards converter is also used to produce a 30-frame-per-second interlaced video signal by repeating every 5th field of the 24-frame-per-second interlaced video input.
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Hamalainen Kaarlo Juhani
Leacock Thomas James
Stec Kevin John
Zhu Daniel Qiang
Matsushita Electric - Industrial Co., Ltd.
Powell Mark R.
Sajous Wesner
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