Title:
【発明の名称】エラー項平均化を用いるビットマップ像の解像度交換法
Document Type and Number:
Japanese Patent JP2635034
Kind Code:
B2
Abstract:
PCT No. PCT/US86/01365 Sec. 371 Date Jun. 26, 1986 Sec. 102(e) Date Jun. 26, 1986 PCT Filed Jun. 26, 1986 PCT Pub. No. WO88/00377 PCT Pub. Date Jan. 14, 1988.A system for converting an input bitmap image of one resolution to an output bitmap image of a different resolution. A mapping is defined between pixels in the input bitmap and pixels in the output bitmap. An error term is used to link successive output pixel determinations. For each output value determination, the values of the mapped input pixels are added to the error term to create a test value that determines what output is generated; the output value generated therefrom is then subtracted from the test value to create the next value of the error term. The conversion system is of particular advantage in converting an image having gray scale that is represented in a binary bitmap where gray scale is represented by the ratio of the number of "on" pixels to the number of "off" pixels. The present image conversion system performs a conversion such that the output bitmap represents such gray scale particularly well.
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Inventors:
Irwin, Kathryn
Application Number:
JP50376186A
Publication Date:
July 30, 1997
Filing Date:
June 26, 1986
Export Citation:
Assignee:
WANG LABORATORIES INCORPORATED
International Classes:
B41J2/485; G06F3/12; G06T3/40; G09G5/36; H04N1/40; (IPC1-7): G09G5/36; G06T3/40; G09G5/00
Attorney, Agent or Firm:
Kyozo Yuasa (4 outside)