Method and system for generating histograms from a scanned image

Details Method and system for generating histograms from a scanned image Method and system for generating histograms from a scanned image

1996-11-21

1998-11-10

Boudreau, Leo H.

Image analysis

Histogram processing

382172, G06K 900, G06K 938

Patent

active

058356282

ABSTRACT:
A method and system generates a histogram from a scanned image by creating a sample window defined by a number of scanlines to be sampled, a number of leading scanlines to be skipped in a slowscan direction before sampling, a number of leading pixels to skip in a fastscan direction before sampling begins, and a number of pixels within a scantine to be sampled. It is then determined if a number of pixels in the sample window is greater than a capacity of a histogram buffer. If it is determined that the number of pixels in the sample window is greater than the capacity of the histogram buffer subsample windows are created within the sample window. The image is scanned and a predetermined number of pixels within each subsample window is processed to generate a histogram, the predetermined number being less than a total number of pixels in a subsample window if it is determined that the number of pixels in the sample window is greater than the capacity of the histogram buffer, thereby processing a total number of pixels that is less than or equal to the capacity of the histogram buffer.

REFERENCES:
patent: 4569079 (1986-02-01), Yoshida
patent: 5282061 (1994-01-01), Farrell
patent: 5293340 (1994-03-01), Fujita
patent: 5561725 (1996-10-01), Degi et al.
patent: 5588071 (1996-12-01), Schultz

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