Method of the image processing

Details Method of the image processing Method of the image processing

1985-09-18

1989-06-06

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358283, G06K 900

Patent

active

048378461

ABSTRACT:
A method of image processing for sampling the concentration of each portion of an image in the unit of a picture element and for binarizing the concentrations of picture elements in the unit of a submatrix of predetermined size to obtain a bi-level image, being characterized in that the bi-level image is obtained from the concentrations having been sampled according to the steps as follows: (a) calculating the average of the concentrations of the picture elements at every submatrix to which the picture elements belong; (b) determining the number of elements in the submatrix to be treated as either one of black and white according to a predetermined relation with the average; (c) assigning elements in the submatrix as the elements to be treated as either one of black and white up to the number determined in the step (b) in the predetermined order of the concentration of each element.

REFERENCES:
patent: 3665326 (1972-05-01), Sullivan
patent: 4439789 (1984-03-01), Cahill
patent: 4495522 (1985-01-01), Matsunawa et al.
patent: 4578713 (1986-03-01), Tsao et al.

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