Television – Image signal processing circuitry specific to television – Combined noise reduction and transition sharpening
Patent
1992-07-20
1994-07-05
Kostak, Victor R.
Television
Image signal processing circuitry specific to television
Combined noise reduction and transition sharpening
348424, H04N 5213
Patent
active
053272412
ABSTRACT:
In a video signal processing apparatus for restoring a signal which has been bandwidth-compressed by offset sub-sampling after restoring an image from sample points of a same field of a sub-sampled signal, a first adder performs an inter-field averaging process from inter-field signals before or after three adjacent fields. A second adder performs an inter-frame averaging process from inter-frame signals. One field difference and one frame difference are detected from the three adjacent inter-field signals thereby switching an output signal of the first adder and an output signal of the second adder in accordance with the magnitudes of the differences thus detected. In this way, aliasing interferences accompanied with bandwidth compression can be detected. By selecting an optimum eliminating filter, aliasing interference due to interfield sub-sampling and aliasing interference due to inter-frame sub-sampling can be eliminated.
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Ishizu Atsushi
Seki Yoshio
Tokoi Masaki
Kostak Victor R.
Matsushita Electric - Industrial Co., Ltd.
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