Image interpolation system

Details Image interpolation system Image interpolation system

1978-06-21

1980-03-11

Stewart, David L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358133, 358135, 358260, H04N 314

Patent

active

041930924

ABSTRACT:
Analog image data pixels are sampled and held to produce a box car wave representative of the image data. Wave height differences are bridged by linear interpolation, with frequency enhancement imposed at the bridge junctures. The modified image wave is thresholded and sampled at a multiple of the original frequency to provide an image pixel stream comprised of both original image pixels having one or more interpolated image pixels therebetween.
One or more intermediate image lines are interpolated by comparing binary image data, portions of which may be interpolated, on a pixel by pixel or multiple pixel basis one line pair at a time. The pixel comparison produces an address used to identify a specific image pixel pattern from multiple image pixel patterns stored in memory. The image pixel pattern taken from memory is used to form the interpolated intermediate line or lines.

REFERENCES:
patent: 2921124 (1960-01-01), Graham
patent: 4020282 (1977-04-01), Halpern
patent: 4117470 (1978-09-01), Elliott

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