Image analysis – Histogram processing – For segmenting an image
Patent
1996-01-31
1998-12-08
Moore, David K.
Image analysis
Histogram processing
For segmenting an image
382273, 358462, H04N 138
Patent
active
058481826
ABSTRACT:
An image forming apparatus, which converts the analog image read in lines into a digital image containing the density information in pixels, comprises a histogram creating circuit that converts the density information on the target pixels in the digital image into multiple values and creates a histogram having the frequency for each density, a peak density value determining circuit that determines the peak density values of two points at which the frequency of the density histogram peaks, a computing circuit that computes a reference value for density correction of the digital image on the basis of the frequency of the peak density value, a circuit that judges the type of the image on the basis of the features of the density histogram, a circuit that corrects the reference value on the basis of the judged type of the image, and a circuit that corrects the density information about the digital image on the basis of the corrected reference value.
REFERENCES:
patent: 4411015 (1983-10-01), Scherl et al.
patent: 4903145 (1990-02-01), Funada
patent: 5034991 (1991-07-01), Hagimae et al.
patent: 5280367 (1994-01-01), Zuniga
Brinich Stephen
Kabushiki Kaisha Toshiba
Moore David K.
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