Image comparison method
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United States of America Patent
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Nov 30, 1993
Issued Date -
N/A
app pub date -
Oct 22, 1992
filing date -
Jul 5, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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Cited Art Landscape
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