Image processing apparatus with means for adjusting image data f

Details Image processing apparatus with means for adjusting image data f Image processing apparatus with means for adjusting image data f

1996-02-26

1998-09-08

Couso, Jose L.

Image analysis

Histogram processing

For setting a threshold

382168, 382271, 382272, G06K 946, G06K 940

Patent

active

058057234

ABSTRACT:
An object of the present invention is to provide an image processing apparatus that reads density unevenness contained in the image, based on the base density of the image data and performs density data correction. The present invention is an image processing apparatus comprising a reading device for reading an original image and for generating image data, an area dividing device for dividing an area of the original image, a histogram making device which makes a histogram for each divided area in order to extract a base density for each area divided by the area dividing device, wherein the histogram represents a distribution of density level of all pixels in each divided area, a minimum base density extracting device for extracting a minimum base density from among all of the base densities extracted from the histogram for each area, and a control device for adjusting image data for each divided area so as to correspond each of the extracted base density to the minimum base density extracted by the minimum base density extracting device.

REFERENCES:
patent: 4950894 (1990-08-01), Hara et al.
patent: 5138971 (1992-08-01), Yokoyama
patent: 5450502 (1995-09-01), Eschbach et al.
patent: 5454049 (1995-09-01), Oki et al.
patent: 5524070 (1996-06-01), Shin et al.

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