Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1977-12-27
1979-07-31
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358138, 364515, H04N 712
Patent
active
041632575
ABSTRACT:
An apparatus is described which is responsive to a sequence of received data-compacted pixels representative of a coarse two-dimensional image of a remote scene for reconstituting picture point intensity signals representative of the smoothly shading in of the coarse image. In a preferred embodiment the apparatus comprises: first means for utilizing the first one of the sequence of received data-compacted pixels to develop the initial intensity of the first one of a plurality of horizontal lines in a reconstructed image of the remote scene; second means for selectively generating horizontal and vertical gradient information as a function of the received pixels; third means selectively responsive to the initial intensity of any given horizontal line in the reconstituted image and to the associated vertical gradient information for developing by a first interpolation the initial intensity for the following horizontal line; and fourth means selectively responsive to the initial intensity of any given horizontal line and to the horizontal gradient information associated with that given horizontal line for computing a sequence of picture point intensities between each adjacent pair of received pixels in that horizontal line by a second interpolation.
REFERENCES:
patent: 2921124 (1960-01-01), Graham
patent: 3051778 (1962-08-01), Graham
patent: 3366739 (1968-01-01), Parkinson
patent: 4068266 (1978-01-01), Liao
Britton Howard W.
Hamann H. Fredrick
Humphries L. Lee
Pitts Rolf M.
Rockwell International Corporation
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