Adaptive thresholding technique

Details Adaptive thresholding technique Adaptive thresholding technique

1989-03-21

1990-03-13

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 50, 358463, 358466, 307358, 341155, G06K 900

Patent

active

049088750

ABSTRACT:
An adaptive thresholding technique is calculated by using a real-time 16 pixel running average (RA) 18 to which is added on offset value. The offset value 38 is the product of a programmable factor (alpha) and a Sum Absolute Difference (SAD) noise measurement. The adaptive threshold 42 is compared by a comparator 48 with a delayed analog video signal intensity value on line 46 for the pixel associated with the adaptive threshold. The comparator 48 provides a binary video output for further processing. A relative video output may also be provided by taking the difference of the analog video signal 46 and its corresponding running average 18.

REFERENCES:
patent: 3472958 (1969-10-01), Estock
patent: 4012715 (1977-03-01), Essenmacher
patent: 4272789 (1981-06-01), Biron
patent: 4431993 (1984-02-01), Van Der Mark
patent: 4520280 (1985-05-01), Yoshikawa et al.

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