Adaptive thresholder

Details Adaptive thresholder Adaptive thresholder

H - Electricity

04

N

350/4

H04N 1/40 (2006.01) G03B 27/72 (2006.01) G03G 15/30 (2006.01) H04N 1/403 (2006.01)

Patent

CA 1180102

-1- 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 differ- enced, 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 maxi- mum pixel. The subtracted output is brought within predetermined maximum and minimum threshold constraints to provide the new threshold.

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