Image reducing apparatus

Details Image reducing apparatus Image reducing apparatus

1991-03-18

1992-08-11

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 27, 382 47, G06K 900

Patent

active

051386720

ABSTRACT:
An image reducing apparatus for obtaining a reduced image from an image of an original size has: a filter to execute a filtering process to the image of the original size every image block of a predetermined size; a discriminating circuit to discriminate a structure of the image block filter processed by the filter; a correcting circuit to correct an output of the filter in accordance with the discriminated structure; and a binarization unit to binarize the output of the filter. By executing the reduction suitable for the image content in consideration of the peripheral images of the object pixel to be reduced and the peripheral reduced images, a reduced image can be obtained without extinguishing the content of the image of the original size, and especially, without fading or losing the thin lines in the reduced image.

REFERENCES:
patent: 4446484 (1984-05-01), Powell
patent: 4611349 (1986-09-01), Hou
patent: 4783839 (1988-11-01), Bamber
patent: 4805129 (1989-02-01), David

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