Television – Format conversion – Changing number of lines for standard conversion
Patent
1993-05-13
1994-11-15
Kostak, Victor R.
Television
Format conversion
Changing number of lines for standard conversion
348427, H04N 701
Patent
active
053652746
ABSTRACT:
A video signal conversion apparatus for converting high definition television signals band-width compressed by offset sub-sampling to a conventional standard television signal while removing aliasing interference caused by offset sub-sampling and using less memory capacity than is conventionally required is provided. The image of the sub-sampled signal is restored from the sampling points in the current field by an intra-field interpolation circuit, and the number of scan lines is reduced to the same number in the standard television signal format by a scan line number conversion circuit. Half of the pixels in the current field are then substituted into the signal for the one previous frame for inter-frame interpolation by a signal selector which alternately selects a signal from the scan line number conversion circuit and a signal from field memories, and a time-base operation for removing aliasing interference at the standard television signal rate is executed.
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Ishizu Atsushi
Miki Yoichiro
Seki Yoshio
Tokoi Masaki
Kostak Victor R.
Matsushita Electric - Industrial Co., Ltd.
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