Title:
POWER VARYING METHOD
Document Type and Number:
Japanese Patent JPS6374369
Kind Code:
A
Abstract:
PURPOSE:To preserve detailed information of an image keeping reproducibility of halftone by detecting presence of density information and edge information from a binary original image in small block unit, and composing after applying variable power processing to each block. CONSTITUTION:A dither processing circuit 2 performs binarizing by dither processing according to density data from a density data detecting circuit 1. Binary data of a blurred image outputted from the dither processing circuit 2 by a line buffer 7 are synchronized with binary data of an original image and inputted to an edge information detecting circuit 8. Density data applied with variable power by a variable power processing circuit 4 are binarized by a dither processing circuit 3. Image data outputted from the dither processing circuit 3 and edge data outputted from a magnification change circuit 5 are composed giving priority to edge information. Thus, a variable power image excellent in gradation and resolution can be obtained as the dither pattern of an original image is not destructed and edge information can be preserved.
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Inventors:
TSUJI KATSUHISA
Application Number:
JP21810986A
Publication Date:
April 04, 1988
Filing Date:
September 18, 1986
Export Citation:
Assignee:
RICOH KK
International Classes:
G06T3/40; H04N1/393; (IPC1-7): H04N1/393
Attorney, Agent or Firm:
Kenjiro Take