Image processing device

Facsimile and static presentation processing – Static presentation processing – Attribute control

Reexamination Certificate

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Details

C382S264000, C382S266000, C382S176000, C382S199000

Reexamination Certificate

active

06178010

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of Invention
This invention relates to an image processing device, and more particularly to an area separation function which separates the text area and the image area derived from an input image.
2. Description of Related Art
In a digital copier for reading color and/or monochrome original documents and outputting color and/or monochrome documents, an optimal output image is determined by distinguishing between the text area and the image area of an input image by a text/image area separation function, and by changing the processing, calculation parameters, and the like relating to each area.
In the text/image are separation method, when a relatively broad area (for example a 33×33 pixel boundary) of the input image is used to perform text/image determination, a problem occurs where it is difficult to determine the text portion when small point, thin multiple image letters are used and are often mistaken determined to be images (design portions), causing an adverse effect on producing an optimum output image.
SUMMARY OF THE INVENTION
An object of this application, in view of the above described circumstances, is to provide an image processing device capable of performing processing suitable for image portions and text portions.
In order to solve the problem described above, the image processing device uses a first determination means for performing image area separation for input image data by coarse area determination of the input image data, followed by a first image quality correction means correcting the image quality for the input image data based on an image area separation result determined by the first determination means. A second determination means is used for determining image characteristics for the input image data by performing fine area determination, and a second image quality correction means is used to correct the image quality based on the image characteristics determined by the second determination means.
In a second embodiment of the invention, the image processing device uses a first determination means for performing image area separation for input image data by coarse area determination of the input image data, followed by a first image quality correction means correcting the image quality for the input image data based on image area separation results determined by the first determination means. A second determination means is used for determining image characteristics for the input image data by performing fine area determination, followed by a logic calculation means for performing logic calculations using the determination results of at least the first and second determination means, and a second image quality correction means correcting the image quality based on the calculation result of the logic calculation means.


REFERENCES:
patent: 5778156 (1998-07-01), Schweid et al.
patent: 5825937 (1998-10-01), Ohuchi et al.

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