Image processing apparatus and method capable of smoothing image

Details Image processing apparatus and method capable of smoothing image Image processing apparatus and method capable of smoothing image

Filed on

1995-02-22

Date issued

1997-07-08

Examiner

Frahm, Eric

Patent Class

Facsimile and static presentation processing

SubClass

Facsimile

SubSubClass

Recording apparatus

Other Related Categories

358451, 358453, 358457, 382298, 382308, H04N 140, G06K 942

Type

Patent

Status

active

Patent number

056467419

Description

ABSTRACT:
An enlargement/reduction ratio setting unit 205 sets an enlargement/reduction ratio in accordance with the resolution of an input image and the resolution of an output image. A smoothing unit 201 smoothes the input image. A dither/line-gathered area detector 202 detects a dither/line-gathered area of the input image in accordance with the set enlargement/reduction ratio, and controls a switch 203 based on the detection result. Smoothing the image before enlargement/reduction is controlled in accordance with the enlargement/reduction ratio and the feature of an image area including a pixel of interest. This results in an output image of excellent image quality.

REFERENCES:
patent: 4860117 (1989-08-01), Sasaki
patent: 4864413 (1989-09-01), Sasaki
patent: 5309524 (1994-05-01), Hirabayashi et al.
patent: 5418626 (1995-05-01), Semasa
patent: 5489990 (1996-02-01), Ishikawa

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