Method for reducing line width variations in bilevel video image

Details Method for reducing line width variations in bilevel video image Method for reducing line width variations in bilevel video image

1983-04-04

1985-05-14

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358261, 358280, 358282, 382 56, 340730, H04N 141, H04N 140

Patent

active

045176043

ABSTRACT:
For use in a teleconference system, a method of reducing line width variations, which are assumed to be the result of undersampling of the original image. Bilevel data received at a remote site is written into a pair of two-dimensional storage arrays. Data stored in the first array is examined row by row to identify different length-dependent classes of black horizontal pel runs. White or black pels in the second array are overwritten with gray pels at specific pel locations as a function of run length to reduce variations in length. The first array data is then examined on a column by column basis. Black vertical runs are classified and the second array is overwritten with gray pels using the same rules as were applied to horizontal runs. The trilevel second array data may be used to drive a display monitor or may first be subjected to further image processing.

REFERENCES:
patent: 3192315 (1965-06-01), Remley
patent: 3649751 (1972-03-01), So
patent: 3651251 (1972-03-01), Clark
patent: 3920898 (1975-11-01), Torpie
patent: 4010446 (1977-03-01), Kawa
patent: 4204232 (1980-05-01), Mizuno
patent: 4454506 (1984-06-01), Netravali et al.
patent: 4476495 (1984-10-01), Fujisawa et al.

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