DEVICE, METHOD AND PROGRAM FOR EXTRACTING INVISIBLE INFORMATION

摘要

PROBLEM TO BE SOLVED: To extract invisible information even when visible information is overlapped with the invisible information.

SOLUTION: The present invention provides a method for extracting the invisible information from an object with the visible information overlapped with at least a part of the invisible information formed by stealth ink and the method includes steps: for irradiating the object with light which makes the stealth ink emit light: for receiving reflected light from the object; for extracting image information from the received reflected light; for dividing the image information into a plurality of pieces of color channel information; for calculating a correlation function among the pieces of color channel information about the respective pixel values constituting the image information about at least two pieces of color channel information selected from the pieces of color channel information; for reducing and interpolating visible information components about one of the selected color channel information using the correlation function and for extracting the invisible information from one piece of interpolated color channel information.

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