System and method for generating and utilizing histogram data fr

Details System and method for generating and utilizing histogram data fr System and method for generating and utilizing histogram data fr

1996-11-21

1998-05-12

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382168, G06K 900, G06K 938

Patent

active

057518483

ABSTRACT:
A system and method for determining a black threshold grey value for an image. A histogram is generated corresponding to possible grey values of the image and a first grey value having a peak frequency associated with a black distribution is determined from the histogram. A second grey value having a peak frequency equal to one quarter of the peak frequency associated with the first grey value, a third grey value having a peak frequency equal to 5/8 of the peak frequency associated with the first grey value, a fourth grey value located on a negative slope-side of the first grey value having a peak frequency equal to one quarter of the peak frequency associated with the first grey value, and a fifth grey value having a minimum peak frequency associated with the histogram are also determined. A black threshold grey value for the image is calculated from the first, second, third, fourth, and fifth grey values.

REFERENCES:
patent: 5133022 (1992-07-01), Weideman
patent: 5282061 (1994-01-01), Farrell
patent: 5293340 (1994-03-01), Fujita

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