Image processing apparatus with fixed or variable threshold

Details Image processing apparatus with fixed or variable threshold Image processing apparatus with fixed or variable threshold

1989-08-21

1992-02-04

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 22, 382 52, 358465, G06K 938

Patent

active

050864840

ABSTRACT:
An image processing apparatus of this invention is arranged so that a threshold for use in binarization is switched between two types in accordance with whether or not a portion in which input pixel data is located is positioned in the vicinity of an edge portion of an image. One type is a threshold which varies in the width of variation corresponding to the density of the input pixel, while the other type is a fixed threshold. If an objective pixel is located in the vicinity of an edge portion of an image, binarization is carried out with the fixed threshold, while if the objective pixel is located in a non-edge portion, the variable threshold is used.

REFERENCES:
patent: 4386366 (1983-05-01), Mori
patent: 4654721 (1987-03-01), Goertzel et al.
patent: 4821334 (1989-04-01), Ogino et al.
patent: 4878125 (1989-10-01), Katayama et al.
patent: 4958238 (1990-09-01), Katayama et al.
patent: 4969052 (1990-11-01), Ishida et al.

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