Image squeezing circuit for squeezing ordinary-sized image into

Details Image squeezing circuit for squeezing ordinary-sized image into Image squeezing circuit for squeezing ordinary-sized image into

1989-10-30

1991-09-10

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358183, H04N 545, H04N 974, H04N 976

Patent

active

050478397

ABSTRACT:
An image squeezing circuit produces an output image carrying signal for reproducing a small-sized image 1/m times larger than an ordinary-sized image (where m is an integer not less than two), and an input image carrying signal is separated for producing an analog chrominance subcarrier signal, an analog luminance signal and a color subcarrier signal, wherein the analog luminance signal is sampled with a sampling signal n/m times larger in frequency than the color subcarrier signal (where n is an integer not less than three) for producing a decimated digital luminance signal but the analog chrominance subcarrier signal is sampled with another sampling signal n times larger in frequency than the color subcarrier signal in every m pulse intervals of the color subcarrier signal for producing a decimated digital chrominance signal, the decimated digital luminance signal and the decimated digital chrominance signal being supplied to respective digital-to-analog converting circuits in response to a high frequency pulse signal n times larger in frequency than the color subcarrier signal for producing the output image carrying signal.

REFERENCES:
patent: 4063280 (1977-12-01), Hattori
patent: 4134128 (1979-01-01), Hurst
patent: 4204227 (1980-05-01), Gurley
patent: 4220965 (1980-09-01), Heitmann
patent: 4291331 (1981-09-01), Devereux
patent: 4656515 (1987-04-01), Christopher
patent: 4712130 (1987-12-01), Casey

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