Image processing method and system with selection of threshold m

Details Image processing method and system with selection of threshold m Image processing method and system with selection of threshold m

1997-08-07

1999-11-02

Rogers, Scott

Image analysis

Histogram processing

For setting a threshold

382237, 382270, 350457, 350426, 350465, 350466, H04N 1405

Patent

active

059785543

ABSTRACT:
An image processing method for determining a characteristic of image data in each area in whole image area and performing binarization processing appropriate for the characteristic, the method comprises the steps of: calculating gradation levels around a pixel in the image data; selecting a threshold value matrix appropriate for the pixel, in response to the calculating step, from the group consisting of a threshold value matrix consisting of single threshold value elements for simple binarization, a threshold value matrix comprising different threshold value elements for halftone processing, and at least one threshold value matrix comprising interpolation of both the threshold value matrixes; and binarizing the pixel by a systematic dither method using the threshold value matrix which is selected in the selecting step.

REFERENCES:
patent: 5587808 (1996-12-01), Hagihara
patent: 5699454 (1997-12-01), Nakai
patent: 5768441 (1995-11-01), Yoshizawa
patent: 5771107 (1995-12-01), Fujimoto
patent: 5784488 (1994-12-01), Kuwata

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