Method of obtaining optimum threshold values

Details Method of obtaining optimum threshold values Method of obtaining optimum threshold values

1989-12-27

1992-03-17

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 50, 358466, G06K 936

Patent

active

050975200

ABSTRACT:
A binarization method obtains an optimum threshold value for binarization which is used when converting a multi-level image data which describes an input image into a black-and-white bi-level image data. The binarization method includes the steps of counting a first number of black picture elements by varying a threshold value from a darkest tone level to a lightest tone level, counting a second number of picture elements having a tone level other than the lightest tone level, obtaining a percentage of the first number with respect to the second number for each of the varied threshold values so as to normalize a density of the input image, and determining the optimum threshold value for binarization based on the percentage which is obtained for each of the varied threshold values.

REFERENCES:
patent: 3466603 (1969-09-01), Shelton
patent: 3665326 (1972-05-01), Sullivan
patent: 4430748 (1984-02-01), Tuhro et al.
patent: 4675909 (1987-06-01), Egami et al.
patent: 4747149 (1988-05-01), Umeda et al.

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