Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1988-08-04
1990-10-23
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358141, H04N 1100, H04N 712
Patent
active
049656619
ABSTRACT:
A method for increasing the definition of an NTSC video signal using an augmentation channel involves the generation of both a line summation signal as well as a line difference signal. From the line summation signal, a horizontal detail signal may be derived which may be diagonally filtered and added to a diagonally filtered vertical detail signal and transmitted in a bandwidth of approximately 2.5 mega-hertz. Furthermore, the line summation signal may be applied for the derivation of a standard NTSC video signal which is transmitted separately from the augmentation channel. Decoder apparatus comprises a single digital diagonal filter having complimentary output functions resulting in both improved horizontal and vertical resolution at low cost.
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Shepperd John W.
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