Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-01-20
1989-01-24
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 74, 358 21R, 358 65, 358140, H04N 514, H04N 920
Patent
active
048004332
ABSTRACT:
A progressive scanning conversion circuit for converting video signals corresponding to an original image from a predetermined format video signals having an increased scan line rate, the video signals each having a brightness level corresponding to a portion of the original image. The progressive scanning conversion circuit includes a scan line rate increasing circuit (32) responsive to receipt of a video signal having the interlace format scan line rate for increasing the scan line rate of the video signal to form a progressive format video signal, a luminance signal generating circuit (36) for generating a luminance signal corresponding to the brightness level of the corresponding portion of the original image in response to the progressive format video signal, a brightness compensation circuit (34) for generating a brightness compensation signal in response to the luminance signal, and a drive circuit (30) for amplifying the progressive format video signal and adjusting the brightness level thereof in response to the compensation signal.
REFERENCES:
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patent: 3700787 (1972-10-01), Arumugham
patent: 4209808 (1980-06-01), Harwood
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patent: 4587554 (1986-05-01), Tamura et al.
patent: 4661850 (1987-04-01), Strolle et al.
patent: 4672446 (1987-06-01), Ikeda
Japanese Patent Disclosure No. 61-139180, Double Scan Conversion Apparatus.
Japanese Patent Disclosure No. 60-259082, Television Receiver.
NHK Technical Bulletin (Monthly), Dec. 1984, pp. 507-512, "Improvement of Images by Progressive Scan Conversion".
Groody James J.
Kabushiki Kaisha Toshiba
Peng John K.
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