Image processing apparatus

Details Image processing apparatus Image processing apparatus

1990-04-27

1992-10-06

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 50, 358466, 358462, G06K 938

Patent

active

051539250

ABSTRACT:
An image processing apparatus comprises: first binarizing means for binarizing input image data by an average value based on the binarized data of pixels near an objective pixel which has already been binarized; second binarizing means for binarizing the input image data by a predetermined threshold vlaue; and selecting means for selecting either one of the first and second binarizing means in accordance with whether the input image data indicates an edge portion or not, whereby by selecting either a binarizing process by the average density preservation method or a binarizing process by a fixed threshold value in accordance with the presence or absence of an edge of input data, an image of a high grade can be reproduced for either a half tone image or a character image.

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patent: 4729035 (1988-03-01), Tanioka
patent: 4821334 (1989-04-01), Ogino et al.

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