Resolution conversion method and apparatus

Details Resolution conversion method and apparatus Resolution conversion method and apparatus

1994-05-18

1997-12-30

Vu, Kim

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358447, 358451, 382298, 382299, 382258, H04N 140, H04N 1393, G06K 942, G06K 944

Patent

active

057040192

ABSTRACT:
Data processing method and apparatus for converting data such as character data or image data of a resolution X into data of a resolution Y which are effective for use in, particularly, a recording apparatus such as an ink jet printer or the like. The data processing method comprises a first dividing step of dividing the data of the resolution X in the main-scan direction every A bits; a first converting step of converting the divided A-bit data into the B-bit data of the bit number B by using a first conversion pattern table; a second dividing step of dividing the data which was obtained by repeating the conversion by the first converting step by a number of times as many as a plurality of lines in the sub-scan direction every A bits; a second converting step of converting the divided A-bit data into the B-bit data of the bit number B by using a second conversion pattern table; and a reducing step of reducing the data of the resolution Y obtained by the second converting step by a thinning process by using a third conversion pattern table.

REFERENCES:
patent: 4010446 (1977-03-01), Kawa
patent: 4827349 (1989-05-01), Ogata et al.
patent: 4872064 (1989-10-01), Tutt et al.
patent: 5335296 (1994-08-01), Larkin et al.
patent: 5537496 (1996-07-01), Katayama
patent: 5539843 (1996-07-01), Murakami et al.

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