Method for transmitting a high-resolution image over a narrow-band communication channel

Patent 4672444 Issued on June 9, 1987. Estimated Expiration Date:

November 14, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3380028

3438003

3576574

Apparatus for generating graphical configurations
Patent #: 3979742
Issued on: 09/07/1976
Inventor: Kolb , et al.

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Inventor: Krueger

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Inventors

Assignee

RCA Corporation

Application

No. 06/797915 filed on 11/14/1985

US Classes:

348/441, FORMAT CONVERSION315/378, Circular, spiral, or radial sweeps345/699, Controller automatically senses monitor resolution348/384.1BANDWIDTH REDUCTION SYSTEM

Examiners

Primary: Britton, Howard W.

Attorney, Agent or Firm

International Classes

G06T 9/00 (20060101)
H04N 1/41 (20060101)

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.

Other References

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