Image analysis – Histogram processing – For setting a threshold
Patent
1989-10-04
1993-02-16
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 18, 382 21, 382 50, 382 54, G06K 900
Patent
active
051877473
ABSTRACT:
The present invention relates to contextual enhancement of data comprising a matrix of data elements wherein each matrix data location has contained therein data representative of certain characteristics, for example, in the case of image data, the intensity of the image within a range of intensities, or the direction of image contour flow lines at each particular data element within the matrix. A preferred embodiment of the invention described in the present application relates to the field of the enhancement of image data obtained from the scanning of a fingerprint image by a digital black and white camera. This results in a matrix of data elements each of which data elements in the matrix contains data representative of the intensity of the image at the particular matrix point, from a 0 black value to a maximum intensity white value. The variations in intensity therebetween are represented by shades of gray between black and white.
REFERENCES:
patent: 3426325 (1969-02-01), Partin et al.
patent: 3624606 (1971-11-01), Lefevre
patent: 4747152 (1988-05-01), Knutsson et al.
patent: 4813078 (1989-03-01), Fujiwara et al.
Capello Richard D.
Mabry George R.
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