Binarization method

Details Binarization method Binarization method

1991-12-13

1994-09-27

Mancuso, Joseph

Image analysis

Histogram processing

For setting a threshold

358466, G06K 938

Patent

active

053513134

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: 4675909 (1987-06-01), Egami et al.
patent: 4750209 (1988-06-01), Shimura et al.
patent: 4959869 (1990-09-01), Hongo
patent: 5038381 (1991-08-01), Nelson

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