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

1998-12-08

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382168, G06K 900, G06K 938

Patent

active

058481834

ABSTRACT:
A system generates image background and black threshold grey values associated with an image. The system includes a histogram buffer and a peak and valley detection circuit, operatively connected to the histogram buffer, to determine a first grey value having a peak frequency associated with a background, a second grey value having a peak frequency associated with a black threshold, and a third grey value having a minimum frequency associated with a histogram of the image. A quarter peak detection circuit, operatively connected to the histogram buffer, determines a fourth grey value having a frequency equal to one quarter of the peak frequency associated with the first grey value and a fifth grey value having a frequency equal to one quarter of the peak frequency associated with the second grey value. A sigma peak detection circuit, operatively connected to the histogram buffer, determines a sixth grey value having a frequency equal to five-eighths of the peak frequency associated with the first grey value and a seventh grey value having a frequency equal to five-eighths of the peak frequency associated with the second grey level. A neighboring bin detection circuit, operatively connected to the histogram buffer, determines a valley or peak relationship between a grey value being presently analyzed and neighboring grey values, and a parameter generation circuit generates an image background grey value and a black threshold grey value based on the first through seventh grey values.

REFERENCES:
patent: 5282061 (1994-01-01), Farrell
patent: 5293340 (1994-03-01), Fujita

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