Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-07-09
1992-09-01
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 14, 358 37, 358340, 364718, H04N 514
Patent
active
051444348
ABSTRACT:
A video signal processing device is arranged to supply a digital video signal to an infinite impulse response digital filter, to supply the digital video signal from the filter to a look-up table circuit which has a non-linear input-output characteristic, and to emphasize a high-frequency component of the digital video signal by adding the output signal of the look-up table circuit to the digital video signal supplied to the filter, so that a non-linearly emphasizing process can be accomplished at a high speed on the digital video signal. Further, in the video signal processing device, a look-up table circuit is arranged to look up a table by using as an address the output signal of a first subtractor which receives a high-frequency-component-emphasized digital video signal as one of its inputs and to have a non-linear input-output characteristic, the output signal of the look-up table circuit is subtracted from the high-frequency-component-emphasized digital video signal to obtain a high-frequency-component-suppressed digital video signal, the video signal thus obtained is supplied to an infinite impulse response digital filter, and the output signal of the filter is supplied to the first subtracter as its other input, so that the digital video signal can be non-linearly deemphasized at a high speed.
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Tanaka Mitsugu
Yamashita Shinichi
Canon Kabushiki Kaisha
Groody James J.
Hsia Sherrie
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