Apparatus for reading image and method therefor

Details Apparatus for reading image and method therefor Apparatus for reading image and method therefor

1995-10-18

1998-08-18

Boudreau, Leo H.

Image analysis

Image enhancement or restoration

Variable threshold, gain, or slice level

382312, G06K 900

Patent

active

057968764

ABSTRACT:
An image to be read is divided into blocks, and pixels included in each block are consecutively binarized on the basis of a threshold. At this time, the threshold is determined in accordance with a maximum value of an image signal of an area including a block adjacent to an attention-focused pixel. If the threshold is smaller than a reference threshold which is determined in accordance with the maximum value of the image signal of a particular reference pixel of a preceding block, the area is changed, and the threshold is redetermined in accordance with the maximum value of the image signal of the new area.

REFERENCES:
patent: 4593325 (1986-06-01), Kannapell et al.
patent: 4667250 (1987-05-01), Murai
patent: 4709274 (1987-11-01), Tanioka
patent: 4742400 (1988-05-01), Tsuji
patent: 5073958 (1991-12-01), Imme
patent: 5115478 (1992-05-01), Sugiura
patent: 5214294 (1993-05-01), Toyofuku
patent: 5313533 (1994-05-01), Scott

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