Method for transmitting a high-resolution image over a narrow-ba

Details Method for transmitting a high-resolution image over a narrow-ba Method for transmitting a high-resolution image over a narrow-ba

1985-11-14

1987-06-09

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

315378, 340720, 340731, 358133, H04N 712

Patent

active

046724443

ABSTRACT:
By analyzing the spatial-frequency spectrum of a high-resolution image into a low-pass remnant subspectrum band having a nominal high-frequency cutoff below that of one or more other spatial frequency bands, and separately transmitting each band, starting with the remnant band, over a narrow-band communication channel from a transmitter to an image display at a remote receiver, useful information as to the image contents is available more quickly to the viewer of the display than by past methods of transmitting high-resolution image information over a narrow-band communication channel for display.

REFERENCES:
patent: 3380028 (1968-04-01), Gustafson
patent: 3438003 (1969-04-01), Bryan
patent: 3576574 (1971-04-01), Baskin
patent: 3979742 (1976-09-01), Kolb
patent: 3980926 (1976-09-01), Krueger
patent: 4222076 (1980-09-01), Knowlton
patent: 4520396 (1985-05-01), Dischert
patent: 4523230 (1985-06-01), Carlson
R. C. Nicol et al., "Transmission Techniques for Picture Viewdata," British Telecommunications Research Department Report No. 860, Project No. 32 602, Publication Authorised Jul. 30, 1980, pp. 1-11.
Peter J. Burt, et al., "The Laplacian Pyramid as a Compact Image Code", IEEE Transactions On Communications, vol. COM-31, No. 4, Apr. 1983, pp. 532-540.
U.S. Patent Application, Ser. No. 596,817, filed Apr. 4, 1984, Carlson et al.

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