Method and apparatus for anti-aliasing an image boundary during

Details Method and apparatus for anti-aliasing an image boundary during Method and apparatus for anti-aliasing an image boundary during

1987-11-16

1989-05-16

Goody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358182, 358 22, 382 46, 340727, 340730, 364521, H04N 5262

Patent

active

048314471

ABSTRACT:
A method of processing a foreground array of sample values, a background array of sample values and a crop array of sample values, which three arrays are coextensive and wherein the crop array represents a geometrical figure associated with a non-zero multiplication factor surrounded by a marginal area associated with a zero multiplication factor, comprises selecting a low-pass filtering operation to be carried out on the foreground array, and modifying the crop array so that when the selected low-pass filtering operation is carried out on the modified crop array, the sample values at the periphery of the domain of the resulting filtered crop array are all associated with a zero multiplication factor. The selected low-pass filtering operation is carried out on the foreground array and the modified crop array to provide a filtered foreground array and a filtered crop array respectively. The background array and the filtered foreground array are combined under control of the filtered crop array.

REFERENCES:
patent: 4041527 (1977-08-01), Rayner et al.
patent: 4109278 (1978-08-01), Mendrala et al.
patent: 4409611 (1983-10-01), Vlahos
patent: 4621280 (1986-11-01), Shinohara et al.
patent: 4687681 (1987-08-01), Jackson
patent: 4689682 (1987-08-01), Jackson
patent: 4698666 (1987-10-01), Lake, Jr. et al.
patent: 4698682 (1987-10-01), Astle

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