Image processing method and image processing apparatus

Details Image processing method and image processing apparatus Image processing method and image processing apparatus

1994-05-27

1995-06-06

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358465, H04N 1405

Patent

active

054227356

ABSTRACT:
The invention provides an image processing method and an image processing apparatus suitably applied to an image reading apparatus such as an OCR or a facsimile, by which a drop or a break of a thin line which is caused by a little inclination of an original can be prevented with certainty by a simple processing procedure without emphasizing noise and besides sharp binary digitization processing which does not cause blurring or distortion can be performed even where color characters are present discretely in the original. When a density value of a noticed picture element upon binary processing is lower than a predetermined threshold level, a binary value error of a picture element on the opposite side to the noticed picture element in a main scanning direction or a sub scanning direction is added to the density value of the noticed picture element to obtain a sum value, and the sum value is compared with the predetermined threshold level. When the sum value is equal to or higher than the predetermined threshold level, binary digitization is performed for the noticed picture element.

REFERENCES:
patent: 4710822 (1987-12-01), Matsunawa
patent: 4853792 (1989-08-01), Katsuta et al.
patent: 4975786 (1990-12-01), Katayama et al.

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