Image comparison method

Details Image comparison method Image comparison method

1992-10-22

1993-11-30

Razavi, Michael T.

Image analysis

Histogram processing

For setting a threshold

382 5, G06K 900

Patent

active

052673243

ABSTRACT:
A method for comparing two images including ridges with each other, comprising steps from i) to iv).
i) Calculating density value of each pixel of an image to be examined and reference image; ii) detecting a direction with minimal change between each pixel and adjacent one, concerning to each pixel; iii) dividing the image to be examined and reference image, calculating an index according to the direction with minimal change as to each block; iv) using the index, it is judged if the image to be examined and reference image substantially coincide to each other.

REFERENCES:
patent: 4947442 (1990-08-01), Tanaka et al.
patent: 5040224 (1991-08-01), Hara
patent: 5109428 (1992-04-01), Igaki et al.
Pattern Recognition, Pergamon Press, A Syntactic Approach to Fingerprint Pattern Recognition, B. Moayer and K. S. Fu, 1975, vol. 7, pp. 1-23.
Second USA-JAPAN Computer Conference, Fingerprint Identification System, Ko Asai, Yukio Hoshino, Naoki Yamashita and Seiichi Hiratsuka, 1975, pp. 1-4-1 to 1-4-6.

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