Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-11-17
1991-03-26
Peng, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 11, 358 12, 358140, 358 15, H04N 704, H04N 701, H04N 1110, H04N 1106
Patent
active
050033891
ABSTRACT:
An image signal processing apparatus is provided which is applicable to a motion adaptive Y/C separation of an NTSC signal and a time-domain/spatial interpolation of a high definition television signal band-compressed by sub-Nyquist sub-sampling. The apparatus includes a still image processing circuit having frame memories, a motion image processing circuit having a line memory, a mixing circuit for mixing outputs of these processing circuits, a circuit for detecting image motion of an input image signal and applying a resultant control signal to the mixing circuit, and a signal mode control circuit for selectively adapting the image processing circuits for the processing of the NTSC signal or the high definition television signal. The motion detecting circuit includes a narrow band detecting circuit for producing a one-frame interval difference signal of a signal spectrum of a pure low frequency component from the NTSC signal or the high definition television signal respectively, a wide band detecting circuit for a two-frame interval difference signal and a composition circuit for composing outputs of these detecting circuits. The still image processing circuit, motion image processing circuit and mixing circuit are adapted to operate for the Y/C separation with the NTSC signal and for the interpolation of the high definition television signal, respectively.
REFERENCES:
patent: 4704627 (1987-11-01), Yuyama et al.
patent: 4794447 (1988-12-01), Tsinberg
patent: 4800427 (1989-01-01), Plantholt
patent: 4807056 (1989-02-01), Sasaki et al.
Hamada Masanori
Isobe Mitsuo
Morita Katsumi
Ninomiya Yuichi
Matsushita Electric - Industrial Co., Ltd.
Nippon Hoso Kyokai
Peng John K.
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