Picture element data density conversion apparatus

Details Picture element data density conversion apparatus Picture element data density conversion apparatus

1992-05-26

1994-02-22

Ip, Paul

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358338, 358342, 358428, 382 27, 382 48, 382 53, 348384, 348438, H04N 1387, G06F 1566

Patent

active

052892921

ABSTRACT:
A picture element data density conversion apparatus, enabling arbitrary amounts of data density reduction to be independently selected for the horizontal (i.e. main) and vertical (i.e. secondary) scanning directions of a picture field, executes processing along a continuous path in which horizontally successive input values along each line of the field are first periodically selected and horizontal weighted averaging between specific pairs of these selected values is executed, then periodic selection of successive lines of the horizontal weighted average values thus obtained is executed, and vertical weighting averaging between vertically corresponding pairs of values in the selected line pairs is performed, to obtain density-reduced output data.

REFERENCES:
patent: 4305022 (1981-12-01), Mitamura et al.
patent: 4410914 (1983-10-01), Siau
patent: 4614977 (1986-09-01), Kawahara et al.
patent: 4809343 (1989-02-01), Wakabayashi et al.
patent: 5089900 (1992-02-01), Yokogawa
patent: 5121219 (1992-06-01), Yokogawa
patent: 5124808 (1992-06-01), Yokogawa

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