Methods and systems for registering image data

Details Methods and systems for registering image data Methods and systems for registering image data

G - Physics

06

K

G06K 9/03 (2006.01) G06K 9/32 (2006.01) G06K 9/40 (2006.01) G06K 9/64 (2006.01) G06T 7/00 (2006.01) H04N 1/00 (2006.01) H04N 1/38 (2006.01) H04N 1/387 (2006.01)

Patent

CA 2354616

Methods and systems for estimating a correction angle (Figs. 5 and 6) that rotationally aligns a first polar centered image with a second polar centered image (50), wherein the first and second polar centered images include values on a polar grid having evenly spaced polar angle coordinates for each of at least one radial distance coordinate, include the following steps: calculating a polar cross-power spectrum for the first and second polar centered images, the polar cross-power spectrum comprising a phase profile having at least polar angular frequency coordinates; and fitting a linear function of the angular frequency coordinate to the phase profile of the polar cross-power spectrum to determine the correction angle (.DELTA.).).

L'invention concerne des procédés et des systèmes qui permettent d'estimer un angle de correction (fig. 5) qui aligne par rotation une première image polaire centrée avec une deuxième image polaire centrée (50). La première et la deuxième images polaires centrées incluent des valeurs relatives à un quadrillage polaire présentant des coordonnées d'angle vectoriel à espacement régulier pour au moins chaque coordonnée ayant une distance radiale. Ces procédés et systèmes consistent à calculer un interspectre polaire comprenant un profil de phase ayant au moins des coordonnées de fréquence angulaire polaire; et à adapter une fonction linéaire de la coordonnée de fréquence angulaire au profil de phase de l'interspectre polaire pour déterminer l'angle de correction (53).

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