Smiths Heimann Biometrics Gmbh

Ralph Leszmann

Torsten Eichhorn

Joerg Standau

Andreas Meister

A process is disclosed for the electronic recording of an image of the surface of an object, which image can be displayed as a function G(x, y), wherein x and y are the coordinates of a respective image point of the image and G designates its gray value, wherein the object is recorded sequentially over different times t , where t >t , from different perspectives as function G in order to form the total image G from the individual images G (x, y) such as when rolling a finger for recording a fingerprint, wherein portions are cut out of the individual images and joined together depending on the respective recorded view, wherein a curved intersection line is determined for defining the portions of every image aside from the first image G by comparison with the image content of the previously recorded or assembled image G , wherein the portion of the image G is defined by this curved intersection line and the corresponding portion of the image G is subsequently added to this intersection line to form the total image G (x, y), wherein this intersection line is determined by forming a similarity function G (x, y) between the images G and G , which similarity function G (x, y) is external with identical gray values at identical image point coordinates or also by including their surroundings, and the intersection line is formed by a curve y (x) which runs through at least one extreme with a very high similarity of the similarity function G (x, y).

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Jena, Germany

Ralph Leszmann