Method of and circuit arrangement for changing the resolution of

Details Method of and circuit arrangement for changing the resolution of Method of and circuit arrangement for changing the resolution of

1986-12-19

1989-05-02

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358287, 358298, H04N 140, H04N 1393

Patent

active

048273538

ABSTRACT:
A first pseudo-halftone picture is converted to a second pseudo-halftone picture of reduced resolution in the ration m:n by dividing the first picture into contiguous picture fields each having i.multidot.n lines and j.multidot.n columns of picture elements in contiguous square subfields each having n.sup.2 picture elements. m.sup.2 elements are selected from each subfield in accordance with a selection sequence which depends on the position of the subfield in the picture field, the elements being selected from all i.multidot.n lines and all j.multidot.n columns of each picture field, the selection sequence being the same for each picture field.

REFERENCES:
patent: 4698778 (1987-10-01), Ito et al.
patent: 4701808 (1987-10-01), Nagashima
patent: 4740844 (1988-04-01), Yoshimura
Tuhro, Richard H., "Image Scaling Using Bit Throw-Away Memory", Xerox Disclosure Journal, vol. 5, No. 6, Nov./Dec. 1980, p. 639.

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