Adaptive thresholder

Details Adaptive thresholder Adaptive thresholder

1981-07-09

1984-04-10

Wise, Edward J.

Image analysis

Histogram processing

For setting a threshold

G06K 900

Patent

active

044425449

ABSTRACT:
An adaptive thresholder for processing image pixels. A portion of the image pixel line or lines is examined and the maximum and minimum pixels in the line portion determined. The maximum and minimum pixels are differenced, and the resulting difference signal compared to a constant representing the minimum desired change in background level. Where the difference signal is larger, a new threshold is thereafter used.
To determine the new threshold level, the difference signal is multiplied by a factor representing the amount of change in threshold for a given event and the result subtracted from the previously determined maximum pixel. The subtracted output is brought within predetermined maximum and minimum threshold constraints to provide the new threshold.

REFERENCES:
patent: 3502993 (1970-03-01), Schorzinger et al.
patent: 3509533 (1970-04-01), Bieser et al.
patent: 3599151 (1971-08-01), Harr
patent: 3833883 (1974-09-01), Haupt et al.
patent: 3852714 (1974-12-01), Carson
patent: 4051536 (1977-09-01), Roetling
patent: 4132977 (1979-01-01), Nagano
patent: 4159432 (1979-06-01), Burke et al.
patent: 4234867 (1980-11-01), Butin
patent: 4259662 (1981-03-01), Yoshida
Dynamic Video Thresholding, H. Klepp, IBM Technical Disclosure Bulletin, vol. 22, No. 3, Aug. 1979, pp. 1031-1033.

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