Method of co-centering two images using histograms of density change
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United States of America Patent
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Mar 11, 1997
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app pub date -
Dec 10, 1992
filing date -
Jul 12, 1990
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Abstract
An image positioning method for co-centering two images including ridges with each other, first a density value of each pixel of an image to be examined and a reference image are calculated. A change of density value between pixels in neighborhoods along the first and the second directions of each pixel of the image to be examined and the reference image are determined and a histogram of density change along the first and second directions of the image to be examined and the reference image is also determined. A maximum or minimum point of the histogram of the first and second directions is determined as a characteristic point of the image to be examined and the reference image. The image to be examined and the reference image are determined to fit when the characteristic points coincide with each other.
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