Image analysis – Histogram processing – For setting a threshold
Patent
1989-05-04
1991-07-23
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 55, G06K 936
Patent
active
050349929
ABSTRACT:
An image processing method produces a density weighted or unweighted distance transformation of an image. An original image is stored. When a background density is lower than a configuration density, an index image is generated by replacing pixels having a configuration density with a first selected value and other pixels with a zero value. A first image transformed is generated by replacing pixels in the index image with the minimum value of surrounding pixels in a neighborhood. A first addition-fixed image is generated by adding pixels values of the transformed image to corresponding pixel values of the original image. A second transformed image is generated by replacing pixels in the addition-fixed image with a minimum value of surrounding pixels in a neighborhood, and a second addition-fixed image is generated by adding pixel values of the second transformed image to corresponding pixel values of the original image. A plurality of transformed and addition-fixed images may be generated until an addition-fixed image is substantially identical to a previously generated addition-fixed image.
REFERENCES:
patent: 4646355 (1987-02-01), Petrick et al.
patent: 4809343 (1989-02-01), Wahabayashi et al.
patent: 4823194 (1989-04-01), Mishima et al.
patent: 4853970 (1989-08-01), Ott et al.
Boudreau Leo H.
Ezel Inc.
Johns Andrew W.
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