Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-07-21
1988-08-30
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358105, 358136, 358135, H04N 701
Patent
active
047680920
ABSTRACT:
An image signal conversion device for handling an interlaced image signal whereby one frame picture plane is formed by multiplexing, in an alternately time sharing manner, odd- and even-number field image signals which form the interlaced image signal and respectively correspond to odd- and even-number field picture planes consisting of horizontal scanning lines alternately located on a picture plane is arranged to form a high resolution image signal by increasing the number of horizontal scanning line signals forming each of said field image signals in the following manner: A given field image signal within the interlaced image signal is assumed to be a first field image signal; an inner-field interpolation signal for the first field image signal is formed by using the first field image signal; an inter-field interpolation signal for the first field image signal is formed by using at least a second field image signal which is received immediately before the first field image signal; either the inner-field interpolation signal or the inter-field interpolation signal is selected for the interlaced signal by using at least the first and second field image signals; and a high solution image signal is obtained with the number of the horizontal scanning line signals increased for each of the field image signals by carrying out interpolation using the interpolation signal selected.
REFERENCES:
patent: 3715483 (1973-02-01), Limb
patent: 4658293 (1987-04-01), Arai
patent: 4661850 (1987-04-01), Strolle
patent: 4672445 (1987-06-01), Casey
patent: 4679084 (1987-07-01), Topper
Britton Howard W.
Canon Kabushiki Kaisha
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